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qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output applica t ions ? telecommu ni cation s ? data communic a tions ? w i r e less communications ? servers, wo rkstatio ns bene fits ? high effici en cy ? no heat si nk re qui red ? high er curren t capability at 70 oc than m o st comp etitors? 40 a half-bri c ks features ? ro hs lead -free sol der a n d lead-sold er-e xempted prod uct s are available ? delivers up to 40 a ? outputs avail able: 3.3, 2. 5, 1.8, 1.5, 1.2 and 1.0 v ? industry - sta n dard q u a r ter-brick pin out ? on-b oa rd inp u t differential lc-filte r ? startup into p r e-bia s ed loa d ? no minim u m load re qui red ? dimen s io ns: 1.45? x 2.30? x 0.425? (36.83 x 58.4 2 x 10.80 mm) ? weig ht: 1.2 oz [34.2 g] ? meets ba sic i n sul a tion re q u irem ents of en609 50 ? withsta n d s 1 00 v input tra n sie n t for 100 ms ? fixed-fre que ncy ope ration ? fully prote c te d ? remote output s e ns e ? non - lat chin g / latching o t p option ? positive or ne gative logic o n /off optio n ? output voltag e trim rang e: +10%/ ? 20% with indu stry-stan dard trim e q u a tions ( 10% for 1.2 v and 1.0 v) ? high reliabilit y: mtbf = 13.9 million hours, cal c ulate d pe r telcordi a t r -3 32, metho d i ca se 1 ? ul6 095 0 re cogni zed in us and can a d a and demko certified per iec/e n 60 950 (pen ding) ? de sign ed to meet cla ss b cond ucte d e m issi on s pe r fcc a nd en5502 2 wh en use d with external filter ? all materials meet ul94, v-0 flammabilit y rating description the qme 4 8 t 40 dc-dc serie s of co nverters p r ov ide out standi ng the r mal perfo rman ce in high te m peratu r e environ ment s. this pe rformance is a ccomplished th rough the use of patent ed/ patent-p endi n g circuit s , pa ckagin g , and processi ng tech niqu e s to achi eve ul tra-high effi cien cy, excell ent thermal m anag ement, a nd a low-bo d y profile. the low-bo d y profile and the precl u si on of heat si nks mi nimi ze impedan ce t o system ai rflow, thus en han cing cooli ng for b o th up stre am and d o wnst ream d e vice s. the u s e of 100% auto m ation for assembly, co upl ed with advan ced el e c troni c circuit s and the r mal desig n, resu l t s in a prod uct with extremely high relia bility. operating fro m a 36 -75 v input, the qm e48t40 conv erters provid e any sta nda rd output volt age f r om 3.3 v do wn to 1.0 v that can be trim m ed from ?20 % to +10% o f the nomin al output volta ge ( 10% for output volta ges 1.2 v and 1.0 v), thus providing out stan ding d e sig n flexibility. z d -020 57 rev . 4.1 www. power-o ne.com page 1 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output electrical specifications con d itio ns: t a = 25 oc, airflow = 300 lf m (1.5 m/s), vi n = 48 vdc, unl es s otherw i se sp ecifie d. p a r a m e t e r n o t e s m i n t y p m a x units a b solute maximum ratings input voltag e contin uo us 0 80 vdc operating am bie n t t e mperature -40 85 c storage t e mperature -55 125 c in pu t ch aracteristics operating in p u t voltage r a n ge 36 48 75 vdc input und e r voltag e lock out t u rn-on t h reshol d 3 3 3 4 3 5 v d c t u rn-off t h reshold 3 1 3 2 3 3 v d c input voltag e t r ansient 100 ms 100 vdc max i m u m input current 40 adc out @ 36 vdc in v out = 3.3 vd c 4.1 adc v out = 2.5 vd c 3.2 adc v out = 1.8 vd c 2.4 adc v out = 1.5 vd c 2.0 adc v out = 1.2 vd c 1.6 adc v out = 1.0 vd c 1.4 adc input stand-b y current vin = 48v, converter disa ble d 3 ma input no lo ad current (0 lo a d on the o u tput ) vin = 48v, converter ena bl ed v out = 3.3 vd c 50 ma v out = 2.5 vd c 47 ma v out = 1.8 vd c 45 ma v out = 1.5 vd c 44 ma v out = 1.2 vd c 43 ma v out = 1.0 vd c 43 ma input reflecte d-rip pl e curre nt, i s vin = 48v, 25 mhz ban d w i d th v out = 3.3 vd c 10 ma pk- pk v out = 2.5 vd c 9 ma pk- pk v out = 1.8 vd c 9 ma pk- pk v out = 1.5 vd c 9 ma pk- pk v out = 1.2 vd c 8 ma pk- pk v out = 1.0 vd c 8 ma pk- pk input voltag e ripp l e r e jecti o n 120 hz 60 db z d -020 57 rev . 4.1 www. power-o ne.com page 2 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output electrical specifications (continued) con d itio ns: t a = 25 oc, airflow = 300 lf m (1.5 m/s), vin = 48 vdc, un les s otherw i se sp ecifie d. p a r a m e t e r n o t e s m i n t y p m a x units ou tpu t ch aracteristic s extern al lo ad cap a citanc e plus full lo ad ( r esistive) 40,00 0 f output curren t range 0 40 adc current lim i t incepti o n non-l a tchin g 42 47 52 adc peak short-ci rcuit curre nt non-l a tchin g , short = 10 m ? 50 60 a rms short-cir cuit curre nt non-l a tchin g 9 arms output voltag e set point (no load) v out = 3.3 vd c 3.267 3.300 3.333 vdc v out = 2.5 vd c 2.475 2.500 2.525 vdc v out = 1.8 vd c 1.782 1.800 1.818 vdc v out = 1.5 vd c 1.485 1.500 1.515 vdc v out = 1.2 vd c 1.188 1.200 1.212 vdc v out = 1.0 vd c 0.990 1.000 1.010 vdc output regu la tion over lin e 2 5 mv output regu la tion over loa d 2 5 mv output voltag e ran g e over line, loa d and temper atu r e 1 -1.5 +1 .5 %vout output rippl e and n o ise ? 25 mhz band w i dt h v out = 3.3 vd c f u ll loa d + 10 f tantalum + 1 f ceramic 55 110 mv pk- pk v out = 1.0 vd c f u ll loa d + 10 f tantalum + 1 f ceramic 3 5 7 0 mv pk- pk dy namic respons e load ch an ge 50%-7 5%-5 0 % of iout max , di/dt = 0.1 a/ s co = 1 f ceramic (f ig. 3.3v .9) 50 2 mv di/ d t = 5 a/ s co = 470 f pos + 1 f ceramic 130 2 mv settling t i me to 1% of vout 15 2 s efficien cy 100% l o a d v out = 3.3 vd c 91.0 % v out = 2.5 vd c 89.0 % v out = 1.8 vd c 86.5 % v out = 1.5 vd c 84.5 % v out = 1.2 vd c 82.0 % v out = 1.0 vd c 80.0 % 50% lo ad v out = 3.3 vd c 9 2 . 0 % v out = 2.5 vd c 91.0 % v out = 1.8 vd c 88.5 % v out = 1.5 vd c 87.0 % v out = 1.2 vd c 85.0 % v out = 1.0 vd c 83.0 % additional notes: 1 oper ating ambie n t temperat ure ra nge of -40 oc to 85 oc for convert e r. 2 see w a veforms f o r d y namic respo n se and settling time for different output voltages. 3 vout can be incr eased up to 10 % via the sens e leads or 10% via t he trim function. ho w e ver, th e tot a l output voltage trim from all sources should not excee d 10% of v out ( nom ), in or der to e n sure specified operat ion of overv o ltage protection circuitry z d -020 57 rev . 4.1 www. power-o ne.com page 3 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output electrical specifications (continued) con d itio ns: t a = 25 oc, airflow = 300 lf m (1.5 m/s), vin = 48 vdc, un les s otherw i se sp ecifie d. p a r a m e t e r n o t e s m i n t y p m a x units iso l ation ch a r act eristic s i/o isolation 200 0 vdc isolation c a p a c itance 2 nf isolation resistance 10 m ? f eatu r e ch ar acte r istics s w itch in g f r eque nc y 460 khz output voltag e t r im range 3 non-l a tchin g (3.3 - 1.5 v) -20 + 10 % non-l a tchin g (1.2 v and 1.0 v) -10 + 10 % remote sens e comp ensati o n 3 percent of v out ( nom ) + 1 0 % output overvoltage protecti o n non-l a tchin g 1 1 7 1 2 8 1 4 0 % auto-restart perio d appli e s to all p r otection feat ur es 200 ms t u rn-on t i me 4 ms on/off control (positiv e lo gic) converter off (logic lo w ) -20 0.8 vdc converter on (logic hig h ) 2.4 20 vdc on/off control (ne gative l o g ic) converter off (logic high) 2.4 20 vdc converter on (logic l o w ) -20 0.8 vdc z d -020 57 rev . 4.1 www. power-o ne.com page 4 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output operations input and o u tpu t imped a nce these p o wer conve r ters h a ve bee n de sign ed to be stable with n o external ca pacito r s wh e n use d in lo w indu ctan ce in put and outp u t circuits. in many appli c ation s , the indu ctan ce a s so ciated with the distri butio n from the p o w er so urce to the input of the converter can affect the stability of the converter. the a ddition of a 33 f el ectrolytic cap a citor with an esr < 1 ? across the input helps to ensure stabilit y of the converter. in many appli c ation s , the use r ha s to use de co upling capa citance at the load. the power converter will exhi bi t stable operation with external loa d cap a cita nce up to 40,000 f on 3.3 v ? 1.0 v outputs. additionally, see th e emc se ction of th is data sh eet for discu s sio n of other e x ternal co mp onent s whi c h may be req u ired for control of cond ucte d emission s. on/off (pin 2) the o n /off pin is u s ed t o turn the p o w er co nverte r on o r off re m o tely via a sy stem sign al. there a r e two remote co ntrol optio ns available, positive a n d negative lo gi c, with b o th referen c ed to vin(-). a typical co nne ction is sho w n in fig. a. rloa d vi n co ntro l in p u t vi n (+ ) vi n (-) on/o ff vout (+ ) vout ( - ) trim s e n se ( + ) sen se ( - ) ( t op view ) c o n ver te r q m e ser i es fig. a : circu it config uratio n for on/of f function. the po sitive l ogic ve rsi on t u rn s on wh en the on/o ff pin is at a lo gic high and turn s off wh en at a logi c low. t he co n v erter i s on when th e on/ o ff pin i s l e ft open. se e the ele c trical specifi c atio ns fo r logi c high/lo w defin itions. the neg ative logic version turns on wh en the pin is at a logic lo w and turn s off when the pi n is at a logic high. the o n /off pin can be ha rd wi red di re ctly to vin(-) to ena ble automati c powe r up of the conve r ter without the n eed of an external cont rol sign al. the o n /of f pin i s int e rnally pulle d up to 5 v throug h a re sistor. a pro p e r ly deb oun ce d me cha n ical swit ch, ope n-colle ctor t r an sisto r , or fet can b e u s e d to drive the input of the on/off pin. the devi c e must be ca p able of si nki ng up to 0.2 ma at a low level voltage of 0.8 v. a n external vo ltage sou r ce (2 0 v maxi mum) m a y b e co nne cted dire ctly to the on/off inp u t, in whi c h case it mu st b e capa ble of sou r ci ng o r sin k ing up to 1 ma dep e nding on the sign al p o larit y . see the s t artup info rm ation se ction for system ti ming wavefo rms asso ciate d with use of the on/off pin. remote sen se (pins 5 an d 7) the rem o te se nse fe ature of th e conve r ter comp en sate s for voltag e drop s occu rri ng b e twe e n the outp u t pi ns of the co nverter an d the loa d . th e sense(-) (pi n 5) and se nse(+) (pin 7) pi ns sh oul d be con n e c te d at th e lo a d o r at the point where regul ation is required (se e fig. b). 100 10 rw rw rloa d vi n vi n (+ ) vi n (- ) on/ off vout (+ ) vout ( + ) trim sen se ( + ) s e n se (-) (t op vi ew ) co n ver ter qm e series fig. b: remote sense circ uit config uratio n. ca utio n if rem o te se nsi ng is n o t utiliz ed, the se nse(-) pin m u st be conn ecte d t o t h e vou t ( -) pi n ( p in 4), an d t h e sense(+) pin mus t be c o n n e c ted to the v o ut(+ ) pi n (pin 8 ) to ens u re t h e con v er ter w ill r e gula t e at the s p ecifie d ou tp ut v o lta g e. if the se conn ecti ons ar e no t m a de, t h e co n v ert e r w i ll deli v e r a n out pu t v o l t ag e that is sli g h t l y high er t h an the speci fied dat a sheet v a lue. be c a us e the s e ns e le ads c a r r y min i ma l c u r r e n t, large tra c e s on the e nd-u s er b oard a r e not req u ired. ho wever, se nse traces s hould b e ru n side by side and l o cated clo s e to a g r oun d pl ane to minimi ze system n o ise and en su re o p timum perfo rman ce. the co nverte r?s outp u t overvoltage p r o t ection (ovp ) sen s e s th e v o ltage acro ss vout(+) an d vout(-), and not across th e sen s e line s , so the re sistan ce (a nd resulting voltage drop) b e t ween the o u tput pins of the co nverte r and the loa d sh ould be minimized to prevent un wa nted trigge rin g of the ovp. whe n utili zin g the rem o te se nse featu r e, ca re mu st be ta ken no t to exceed the m a ximum allo wa bl e output power capability of the convert e r, whi c h i s equal to the prod uct of the nominal o u t put voltage and the all o wa ble outp u t current for the give n conditions. whe n u s in g remote sen s e, the o u tput v o ltage at the conve r ter ca n be in crea sed by a s m u ch as 10% above the n o minal rating in o r de r to maintain th e requi re d voltage a c ross the load. th erefo r e, the desi gne r mu st, if necessa ry, decre ase the maximum curre n t (origi nally obtai ne d from the de rating curve s ) by the same perce ntage to en sure th e converte r?s z d -020 57 rev . 4.1 www. power-o ne.com page 5 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output actual outpu t powe r re mains at or belo w the maximum all o wa ble outp u t power. output voltage adjust /trim (pin 6) the outp u t voltage can b e adju s ted up 10% or d o wn 20% for vout 1.5 v, an d 10% for vou t = 1.2 v an d 1.0 v relative to the rated output vo ltage by the addition of an externally co nne cted re si stor. the trim pi n sho u ld be l e ft open if trimming is n o t being used. to minimi ze noise pi cku p , a 0.1 f cap a cito r is conne cted int e rnally bet we en the trim and sense(-) pins. to in crea se t he o u tput volt age, refer to fig. c. a trim resi st o r , r t- i n c r , should b e conn ecte d between th e trim (pin 6 ) and sense(+) (pin 7), wit h a value of: 10.22 1.225 ? 626 ? )v 5.11(100 r nom o incr t [k ? ], for 3.3 ? 1.5 v. 7.2 ? 84.6 r incr t [k ? ] (1.2 v ) 9 ? 120 r incr t [k ? ] (1.0 v) whe r e, incr t r req u ire d value of trim-up resi sto r k ? ] nom o v nomin a l valu e of output voltage [v] 100 x v ) v (v ? nom - o nom - o req - o [%] req o v de sire d (trim m ed) o u tput voltage [v]. whe n trimmi ng up, ca re must b e take n not to exce ed the conve r te r?s maximu m allowa ble o u tput power. see the p r ev ious se ction f o r a com p let e discu s sion of this requi re ment. rloa d vi n vi n (+ ) vi n (- ) on/ off vout ( + ) vout ( - ) trim sen se ( + ) se n se (- ) r t - i ncr (t op view ) c o n verter qme s e r i es fig. c: config uratio n for incr easi ng o u tput voltag e. to de cre a se the output voltage (fi g . d), a tri m resi st o r , r t - decr , should be co nne cte d betwe en the trim (pin 6 ) and sense(-) (pin 5), with a value of: 10.22 | ? | 511 r decr t [k ? ] (3.3 ? 1.5 v) 15 | ? | 700 r decr t [k ? ] (1.2 v) 17 | ? | 700 r decr t [k ? ] (1.0 v) whe r e, decr t r req u ire d value of trim-d own resi sto r [k ? ] and ? is define d above. not e : the above equa tions for calculat ion of trim resistor values match those typically used in convention a l industr y-stand ard qu arte r-b ricks (except fo r 1.2 v and 1.0 v outpu t s ). rloa d vi n vi n (+ ) vi n (- ) on/ off vout ( + ) vout ( - ) trim sen se ( + ) se n se (- ) r t - de cr ( t op vi ew ) c o n vert er qme series fig. d: config uratio n for decr eas i ng o u tput voltag e. trimmin g /se n s ing beyon d 110% of th e rated outp u t voltage is no t an accepta b le de sign p r actice, as thi s con d ition co uld cau s e u n wa nted trig gerin g of th e output overv o ltage p r ote c tion (ovp) circuit. th e desi gne r sh o u ld ensure that the difference betwe e n the voltage s across the co nverter? s outp u t pin s and its sen s e pi ns d oes n o t exce ed 10% of v out ( nom ), or: x nom - o sense sense out out 10% v )] ( v ) ( [v )] ( v ) ( [v d [v] this eq uation is appli c able for any con d ition of output sen s in g and/ or output trim . z d -020 57 rev . 4.1 www. power-o ne.com page 6 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output protection features input un der v o l tage lock out input und erv o ltage lo cko u t is stand a r d with this converter. t he converter will shut down when the input voltage drop s bel ow a pre - dete r mi ned voltage. the input vo ltage must b e typically 34 v for the c onverter to turn on. on ce the conve r ter h a s bee n turned o n , it will shut of f when the i nput voltage drop s typi call y below 32 v. this fe ature is b enefi c ial in preventing deep di scha rging of batt e rie s u s e d in telecom a ppli c ation s . outpu t ov ercurren t protection (ocp ) the conve r t e r i s p r ote c ted a gain s t o v ercu rrent o r sho r t circuit condition s. up on se nsin g a n overcurrent condition, the converter will swit ch to constant curre n t ope ra tion and th ereby begi n to redu ce outpu t voltage. whe n the outp u t voltage d r o p s b e lo w 60% of the nomin al value of output voltage, the converte r will shut down. once the converter has shut down, it will attempt to r e s t ar t no mina lly e v e r y 200 ms w i th a typ i c a l 3- 5 % duty cycle. the attem p ted restart will continue indefinitely until the o v erload o r sh ort circuit con d ition s a r e rem o ved o r the o u tput voltage ri se s above 40 -50 % of its nominal value. once the o u tput cu rrent is b r ou ght back into its spe c ified ran ge, the conve r ter autom atically exits the hiccup mo de and continu e s normal op eration. outpu t ov erv o ltage protection (ovp) the converter will shut down if the output voltage across vo ut(+) (pin 8) an d vout(-) (pi n 4) ex cee d s the threshold of the ovp circuitry. the ovp circuitry contai ns it s o w n referen c e, indep ende nt of the output voltage re gul ation loo p . o n ce th e conv erter ha s shu t down, it will attempt to re st art every 200 ms until the ovp conditio n is rem o ved. ov ertemperature pro t ec tion (otp ) the conve r ter will shut do wn unde r a n overtemp erat ure con d itio n to protect itself from overhe ating caused by ope ra tion out side the therma l deratin g curv es, or ope rati on in ab no rm al co ndition s s u c h as s y s t em fan failure. after the c onverter ha s cool ed to a safe operating temperature, it will automatically resta r t. safety requi rements the conve r ters meet no rth a m eri c an an d internation a l safety re g u latory requi reme nts p e r ul6 095 0 and en609 50 (p endin g ). basi c insulation i s provide d bet wee n input a nd output. to co mply with safety agen cie s ? re q u irem ents, a n input lin e f u se mu st b e u s ed external to th e conve r ter. the tabl e below p r ovide s the recommended fuse rating for us e with this family of prod uct s . ou tpu t voltage f u se ratin g 3.3 v 7.5 a 2.5 v, 1.8 v 5 a 1.5 v, 1.2 v, 1.0 v 3 a all qme con v erters are ul app roved (pendi ng) fo r a maximum fuse rating of 15 amps. to p r otect a g r ou p of conve r ters with a sin g l e fuse, th e rating can be increa sed fro m the recom m ende d valu e above. electromag n e tic comp ati b ilit y (emc) emc requi re ments m u st be met at th e end -p rod u ct system l e vel, as n o spe c if ic sta nda rd s dedi cated to emc charact e risti cs of bo ard m ounte d comp one nt dc-dc conve r t e rs exi s t. ho wever, po wer-one te sts its conve r ters to seve ral system leve l standa rd s, prima r y of which is th e more stri nge nt en55 022, inform ation tech nolog y e quipm e n t - rad i o disturban ce cha r a c teri stic s-lim i ts and m e thods of m easurem ent. an effective i n ternal l c di fferential filter sig n ificantly redu ce s inp u t reflected rip p le cu rrent, and improve s emc. with the ad dition of a simple external filter, all versio ns of the qme - seri es of conve r t e rs pa ss the requi rem ents of cla ss b con d u c ted e m issi on s pe r en550 22 an d f c c requi reme nts. ple a se conta c t powe r-o ne applicatio ns enginee ring for d e tails of this tes t ing. z d -020 57 rev . 4.1 www. power-o ne.com page 7 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output startup infor m ation (usin g negativ e on/off ) scenario #1: initial startup from bulk su pply on/of f function en ab led, co nver ter started via ap plic atio n of v in . see f i gure e. t i m e c o m m e n t s t 0 on/of f pin is on; sy stem fro n t end p o w e r is toggl ed o n , v in to converter begins to rise. t 1 v in crosses un dervo ltage loc kout protectio n circuit thresh ol d; converter e n abl ed. t 2 conv erter beg i n s to respon d to turn-on command (converter turn-on delay ). t 3 conv erter v out reaches 1 0 0 % of nomina l val ue. f o r this examp l e, the total con v erter startup time (t 3 - t 1 ) is t y pic a ll y 4 ms. scenario #2: initial startup using on/o f f pin with v in previo usl y po w e re d, converter start ed via on/of f pin. see f i gur e f . t i m e c o m m e n t s t 0 v input at nomin al val ue. t 1 arbitrary time w hen on/of f pin is e n a b le d (converter e n a b le d). t 2 end of conv erter turn-on d e l a y. t 3 conv erter v out reaches 1 0 0 % of nomina l val ue. f o r this examp l e, the total con v erter startup time (t 3 - t 1 ) is t y pic a ll y 4 ms. scen ario #3: t u r n - o f f an d rest art usin g on/of f pin with v in previo usl y po w e re d, converter is d i s abl ed a nd then en ab led vi a on/of f pin. see f i gur e g. t i m e c o m m e n t s t 0 v in and v out are at nomin al va lues; on/of f pin on. t 1 on/of f pin arbitraril y d i sa ble d ; converter output falls to zero; turn -on i n h i bit de la y p e rio d (200 ms t y pica l ) is initiate d, an d on/of f pin action is i n tern all y in hi bited. t 2 on/of f pin is ext e rna l l y re-e nab led. if (t 2 - t 1 ) 200 ms , ex ternal action of on/of f pin is locke d out b y s t artup inh i bit timer. if (t 2 - t 1 ) > 200 ms , on/off pin action is intern all y e n a b l ed. t 3 t u rn-on inhibit del a y peri od e nds. if on/of f pin is on, converter begins turn-on; if off, converter a w aits on/of f pin on signa l; see f i gure f . t 4 end of conv erter turn-on d e l a y. t 5 conv erter v out reaches 1 0 0 % of nomina l val ue. f o r the conditi on, (t 2 - t 1 ) 200 ms , the total converter startup time (t 5 - t 2 ) is typica ll y 204 ms. f o r (t 2 - t 1 ) > 200 ms , startup w i l l be typ i cal l y 4 ms a fter release of on/of f pin. v in on / o f f st a t e v ou t t t 0 t 1 t 2 t 3 on of f fig. e: startup scenari o #1. on/of f sta t e v ou t t 0 t 1 t 2 t 3 on of f v in t fig. f: startup scenar io #2. fig. g: startup scenari o #3. on/off state off on v out t 0 t 2 t 1 t 5 v in t t 3 4 t 200 ms z d -020 57 rev . 4.1 www. power-o ne.com page 8 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output characteriz ation gener a l info rmation the conve r t e r h a s be en ch ara c te rized for ma ny operational asp e ct s, to inclu de the r mal de rating (maximum l o ad current a s a fun c tion of ambient temperature and ai rflow) for vertical a nd ho rizo ntal mounting s , efficien cy, startu p and sh utdo wn para m eters, output rip p le and no ise, tran sien t respon se to load ste p -ch ange, ove r lo ad, and sho r t c i rc uit. the follo win g pag es contain spe c i f ic plots or waveforms a s soci ated wit h the co nvert e r. additional comm ents fo r spe c ific data are p r ovide d belo w . test conditi ons all data pre s ente d were take n with the conve r ter sold ere d to a test bo ard, spe c ifically a 0.060 ? thi c k printed wi rin g boa rd (p wb) with fou r la y e rs. t he to p and b o ttom la yers we re not metalized. t he two inn e r layers, comp rised of two - o unce cop p e r , were used to provide trace s for conne ct i v ity to the converter. the l a ck of metalizatio n on the o u ter layers a s wel l as the limited thermal co n nectio n en su red that he at trans fer from the c onv erter to the pwb was minimized. this provide s a worst-ca se but con s i s ten t scena rio for t herm a l derating purpo se s. all measu r e m ents requi ri ng airflo w we re made in th e vertical and h o rizontal win d tunnel usi ng infrare d (i r) thermo gra p h y and thermo cou p le s for thermom e try. ensu ring co mpone nts o n the conv erter d o no t excee d their rating s is imp o rtant to mai n taining hig h reliability. if one antici pat es ope ratin g the conve r ter at or clo s e t o the maxim u m load s sp ecified i n the deratin g cu rves, it is prud ent to che c k actu al operating t e mpe r atures in the appli c atio n. therm o g r ap h i c imagi ng is p r eferable; if this cap ability is not available, then thermo cou p le s may be use d . the use of awg #40 gau ge th ermo co uple s is re comm en ded to en su re me asure m ent a c curacy. careful routing of the ther mocouple l e ads will further minimize me asu r em ent e r ror. refe r to fig. h fo r the optimum mea s uri ng the r mo cou p le lo catio n s. fig. h: locations of the ther moco uple for thermal testing. thermal de r a ting load cu rrent vs. ambi en t temperature an d ai rflo w rates are given in fig. x.1 and fig. x.2 for vertical an d hori z ontal co nverter mo un tings. ambie n t temperatu r e wa s va ried b e twee n 2 5 c a n d 85 c , with ai rflo w rates from 30 to 500 lfm (0.15 to 2.5 m/s). for ea ch set of conditio n s, the maximum load cu rre n t wa s define d as the lo we st of: (i) the outp u t current at which a n y fet junctio n temperature doe s not ex cee d a maxi mum spe c ifie d temperature of 120 c as i ndi cat ed by th e thermo gra phi c image, o r (ii) the n o min a l rating of the conve r ter (40 a). duri ng no rmal o peration, de rating cu rve s wi th maximum fe t temperature less o r eq ual to 12 0 c sho u ld n o t b e exceede d. tempe r atu r e on the p c b at thermo co uple location s sh own in fi g. h sh ould not excee d 12 0 c in ord e r t o operate in sid e the d e ratin g curv e s . efficiency fig. x.3 shows the effici e n cy vs. load curre n t plot for ambient temp eratu r e of 25 oc, airflo w rat e of 300 lfm (1.5 m/s) wit h hori z o n tal mounting an d input volta ges of 36 v, 48 v and 72 v. also, a plot o f efficiency vs. load cu rrent, as a functi on of ambie n t temperatu r e with vin = 48 v, airflow rat e of 200 lf m (1 m/s) wit h hori z ontal m o unting is sho w n in fig. x.4. po w e r dis s ipation fig. x.5 shows the power dissipatio n vs. load current plot for ta = 25 oc, airflo w rate of 300 lfm (1.5 m/s) with ho rizont al mountin g and inp u t voltages of 3 6 v, 48 v and 72 v. also, a p l ot of power dissipatio n vs. load cu rrent, as a functi on of ambie n t temperatu r e with vin = 48 v, airflow rat e of 200 lf m (1 m/s) wit h hori z ontal m o unting is sho w n in fig. x.6. startup output voltage wavefo rms, du rin g the turn-on transi ent u s i ng the o n / o ff pin fo r full rated lo ad curre n ts (re si stive load ) a r e sh own wit hout an d wit h external loa d cap a cita nce in figs. x.7-8, respe c tively. ripple and noise fig. x.11 show the outp u t voltage ripple wavefo rm, measured at full rated l oad curre n t with a 1 0 f tantalum an d 1 f ce ramic cap a cit o r a c ro ss th e output. note that all o u tput voltage waveforms a r e measured a c ross a 1 f ce rami c ca pa citor. the inp u t reflected ripp le cu rre nt waveform s are obtaine d usi n g the test set up sh own in fig x.12. the corre s p ondin g waveforms are sho w n in figs. x.13-1 4 . z d -020 57 rev . 4.1 www. power-o ne.com page 9 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output am b i e n t t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 load curr ent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 3 . 3 v .1 : avail a b l e lo ad c u rrent vs . ambi ent a i r temperatur e an d airflo w r a tes for qme48t 40033 co nverter w i t h g hei ght pins mou n ted verticall y w i t h air flo w i n g fro m pin 1 to pi n 3, mosf et temperatur e 12 0 c, vin = 48 v. note : nc ? nat u ral con v e c tio n load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi cien cy 0. 75 0. 80 0. 85 0. 90 0. 95 72 v 48 v 36 v fig. 3 . 3 v .3 : efficienc y vs. l oad c u rrent a n d in put volta g e for qme48t 40033 c onv erter mounte d h o riz ontal l y w i th air flo w in g from pi n 1 to pi n 3 at a rate of 3 00 lf m (1.5 m/s) and t a = 25 c. a mbie nt t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 lo ad c u rrent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 3 . 3 v .2 : avail abl e l o a d curre nt vs. ambi ent air temperatur e an d airflo w r a tes for qme48t 40033 co nverte r w i t h g heig h t pins mo unte d horiz ontal l y w i t h air flo w i n g from pin 1 to pin 3, mosf et temperature 1 20 c, vin = 48 v. load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi ci enc y 0. 75 0. 80 0. 85 0. 90 0. 95 70 c 55 c 40 c fig. 3 . 3 v .4 : efficienc y vs. load curr ent and amb i e n t temperatur e f o r qme48t 4003 3 c onvert e r mo unte d horiz ontal l y w i t h vin = 48 v and air fl o w i n g from pi n 1 t o pin 3 at a rate of 200 lf m (1.0 m/s). z d -020 57 rev . 4.1 www. power-o ne.com page 10 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output load c u rrent [a dc] 0 5 10 15 20 25 30 35 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 18.00 72 v 48 v 36 v fig. 3 . 3 v .5 : po w e r d i ssip a tio n vs. load curr ent an d inp u t voltag e for qme48t 40033 co nvert e r mounte d horiz ontal l y w i t h air flo w i n g from pin 1 to p i n 3 at a rate of 300 lf m (1.5 m/s) and t a = 25 c. fig. 3 . 3 v .7 : t u rn-o n transi e nt at full rate d loa d curre nt (resistive) w i t h no outp u t capac itor at vi n = 48 v, trigger ed vi a on/of f pin. t op trace: on/of f signal (5 v/div.). bott om trace: out pu t vo l t ag e (1 v/d i v.). t i me scale: 2 ms/div. load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 18.00 70 c 55 c 40 c fig. 3 . 3 v .6 : po w e r diss ipa t ion vs. loa d current an d ambi ent tem peratur e for qme48t 40033 co nverter mounte d horiz ontal l y w i t h vin = 48 v and air flo w i ng fro m pin 1 to pi n 3 a t a rate of 200 lf m (1.0 m/s). fig. 3 . 3 v .8 : t u rn-o n transie nt at full rated load curre nt (resistive) pl us 10,000 f at vin = 48 v, trigg e red vi a on/of f pin. t op trace: on /of f signal (5 v/div.). bottom trace: outp u t vo lta ge ( 1 v/div.). t i me scale: 2 ms/div. z d -020 57 rev . 4.1 www. power-o ne.com page 11 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output fig. 3 . 3 v .9 : output voltag e respo n se to l oad c u rrent step-cha n g e (2 0 a ? 30 a ? 20 a) at v i n = 48 v. t o p trace: outp u t voltag e (10 0 mv/div.). bottom trace: load current (1 0 a/div. ). curre nt sle w r a te: 0.1 a/s. co = 1 f ceramic. t i me scale: 0.2 ms/div. f i g . 3.3v.11: output volta g e ripp le (2 0 mv /div.) at full rated l o a d curr ent int o a r e sis t ive lo ad w i th co = 1 0 f tantalum + 1 f ceramic an d vin = 48 v. t i me scale: 1 s/div. f i g . 3.3v.10: output volta g e respo n se to l oad c u rre nt step-cha n g e ( 20 a ? 30 a ? 20 a) at vin = 48 v. t op trace: outp u t v o ltag e (1 00 m v /div.). bottom trace: lo ad current (1 0 a/div.). curre nt sle w r a te : 5 a/s. co = 470 f pos + 1 f cer a mic. t i me scale: 0.2 ms/div. vo u t v source i s i c 1 f ce r a mi c capa ci tor 10 h sou r ce indu cta n ce dc / d c co n v erter 33 f es r <1 electrol ytic capa ci tor ? qme seri es f i g . 3.3v.12: t e st setup for measuri ng in put reflecte d rippl e curre nts, i c and i s . z d -020 57 rev . 4.1 www. power-o ne.com page 12 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output f i g . 3.3v.13: input r e fle c ted ri ppl e current, i c (100 ma/d iv.), measur ed at i nput termi na ls at full r a ted loa d curre nt a nd vin = 4 8 v. refer to f i g. 3.3v.12 for test setup. t i me scale: 1 s/div. f i g . 3.3v.15: output voltage vs. lo ad cu rre n t sh o w ing current limit p o int an d conv erter shutdo wn poi nt. input voltag e h a s almost no effect on current lim it character i stic. f i g . 3.3v.14: input r e fle c ted ri ppl e current, i s (10 ma/div.), measur ed thro ugh 10 h at t he so urce at full rate d l o a d curre nt an d vin = 48 v . refer to f i g. 3.3v.12 fo r test setup. t i me scale: 1 s/ d iv. f i g . 3.3v.16: load curre nt (top trace, 20 a/div., 50 ms/div.) int o a 10 m ? s h ort circuit duri ng rest art, at vin = 48 v. bottom trace (20 a/div., 2 ms/div.) is an expa nsio n of the on-time p o rti on of the top trace. z d -020 57 rev . 4.1 www. power-o ne.com page 13 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output am b i e n t t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 load curr ent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 2 . 5 v .1 : avail a b l e lo ad c u rrent vs . ambi ent a i r temperatur e an d airflo w r a tes for qme48t 40025 co nverter w i t h g hei ght pins mou n ted verticall y w i t h air flo w i n g fro m pin 1 to pi n 3, mosf et temperatur e 12 0 c, vin = 48 v. note : nc ? nat u ral con v e c tio n load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi cien cy 0. 70 0. 75 0. 80 0. 85 0. 90 0. 95 72 v 48 v 36 v fig. 2 . 5 v .3 : efficienc y vs. l oad c u rrent a n d in put volta g e for qme48t 40025 c onv erter mounte d h o riz ontal l y w i th air flo w in g from pi n 1 to pi n 3 at a rate of 3 00 lf m (1.5 m/s) and t a = 25 c. a mbie nt t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 lo ad c u rrent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 2 . 5 v .2 : avail abl e l o a d curre nt vs. ambi ent air temperatur e an d airflo w r a tes for qme48t 40025 co nverte r w i t h g heig h t pins mo unte d horiz ontal l y w i t h air flo w i n g from pin 1 to pin 3, mosf et temperature 1 20 c, vin = 48 v. load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi ci enc y 0. 70 0. 75 0. 80 0. 85 0. 90 0. 95 70 c 55 c 40 c fig. 2 . 5 v .4 : efficienc y vs. load curr ent and amb i e n t temperatur e f o r qme48t 4002 5 c onvert e r mo unte d horiz ontal l y w i t h vin = 48 v and air fl o w i n g from pi n 1 t o pin 3 at a rate of 200 lf m (1.0 m/s). z d -020 57 rev . 4.1 www. power-o ne.com page 14 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 18.00 72 v 48 v 36 v fig. 2 . 5 v .5 : po w e r d i ssip a tio n vs. load curr ent an d inp u t voltag e for qme48t 40025 co nvert e r mounte d horiz ontal l y w i t h air flo w i n g from pin 1 to p i n 3 at a rate of 300 lf m (1.5 m/s) and t a = 25 c. fig. 2 . 5 v .7 : t u rn-o n transi e nt at full rate d loa d curre nt (resistive) w i t h no outp u t capac itor at vi n = 48 v, trigger ed vi a on/of f pin. t op trace: on/of f signal (5 v/div.). bott om trace: out pu t vo l t ag e (1 v/d i v.). t i me scale: 2 ms/div. load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 18.00 70 c 55 c 40 c fig. 2 . 5 v .6 : po w e r diss ipa t ion vs. loa d current an d ambi ent tem peratur e for qme48t 40025 co nverter mounte d horiz ontal l y w i t h vin = 48 v and air flo w i ng fro m pin 1 to pi n 3 a t a rate of 200 lf m (1.0 m/s). fig. 2 . 5 v .8 : t u rn-o n transie nt at full rated load curre nt (resistive) pl us 10,000 f at vin = 48 v, trigg e red vi a on/of f pin. t op trace: on /of f signal (5 v/div.). bottom trace: outp u t vo lta ge ( 1 v/div.). t i me scale: 2 ms/div. z d -020 57 rev . 4.1 www. power-o ne.com page 15 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output fig. 2 . 5 v .9 : output voltag e respo n se to l oad c u rrent step-cha n g e (2 0 a ? 30 a ? 20 a) at v i n = 48 v. t o p trace: outp u t voltag e (10 0 mv/div.). bottom trace: load current (1 0 a/div. ). curre nt sle w r a te: 0.1 a/s. co = 1 f ceramic. t i me scale: 0.2 ms/div. f i g . 2.5v.11: output volta g e ripp le (2 0 mv /div.) at full rated l o a d curr ent int o a r e sis t ive lo ad w i th co = 1 0 f tantalum + 1 f ceramic an d vin = 48 v. t i me scale: 1 s/div. f i g . 2.5v.10: output volta g e respo n se to l oad c u rre nt step-cha n g e ( 20 a ? 30 a ? 20 a) at vin = 48 v. t op trace: outp u t v o ltag e (1 00 m v /div.). bottom trace: lo ad current (10 a/div.). current sle w rate: 5a/s. co = 470 f pos + 1 f cer a mic. t i me scale: 0.2 ms/div. vo u t v source i s i c 1 f ce r a mi c capa ci tor 10 h sou r ce indu cta n ce dc / d c co n v erter 33 f es r <1 electrol ytic capa ci tor ? qme seri es f i g . 2.5v.12: t e st setup for measur in g i n put refl ected rippl e curre nts, i c and i s . z d -020 57 rev . 4.1 www. power-o ne.com page 16 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output f i g . 2.5v.13: input r e fle c ted ri ppl e current, i c (100 ma/d iv.), measur ed at i nput termi na ls at full r a ted loa d curre nt a nd vin = 4 8 v. refer to f i g. 2.5v.12 for test setup. t i me scale: 1 s/div. f i g . 2.5v.15: output voltage vs. lo ad cu rre n t sh o w ing current limit p o int an d conv erter shutdo wn poi nt. input voltag e h a s almost no effect on current lim it character i stic. f i g . 2.5v.14: input r e fle c ted ri ppl e current, i s (10 ma/div.), measur ed thro ugh 10 h at t he so urce at full rate d l o a d curre nt an d vin = 48 v . refer to f i g. 2.5v.12 fo r test setup. t i me scale: 1 s/ d iv. f i g . 2.5v.16: load curre nt (top trace, 20 a/div., 50 ms/div.) int o a 10 m ? s h ort circuit duri ng rest art, at vin = 48 v. bottom trace (20 a/div., 2 ms/div.) is an expa nsio n of the on-time p o rti on of the top trace. z d -020 57 rev . 4.1 www. power-o ne.com page 17 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output am b i e n t t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 load curr ent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 8 v .1 : avail a b l e lo ad c u rrent vs . ambi ent a i r temperatur e an d airflo w r a tes for qme48t 40018 co nverter w i t h g hei ght pins mou n ted verticall y w i t h air flo w i n g fro m pin 1 to pi n 3, mosf et temperatur e 12 0 c, vin = 48 v. note : nc ? nat u ral con v e c tio n load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi cien cy 0. 65 0. 70 0. 75 0. 80 0. 85 0. 90 0. 95 72 v 48 v 36 v fig. 1 . 8 v .3 : efficienc y vs. l oad c u rrent a n d in put volta g e for qme48t 40018 c onv erter mounte d h o riz ontal l y w i th air flo w in g from pi n 1 to pi n 3 at a rate of 3 00 lf m (1.5 m/s) and t a = 25 c. a mbie nt t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 lo ad c u rrent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 8 v .2 : avail abl e l o a d curre nt vs. ambi ent air temperatur e an d airflo w r a tes for qme48t 40018 co nverte r w i t h g heig h t pins mo unte d horiz ontal l y w i t h air flo w i n g from pin 1 to pin 3, mosf et temperature 1 20 c, vin = 48 v. load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi ci enc y 0. 65 0. 70 0. 75 0. 80 0. 85 0. 90 0. 95 70 c 55 c 40 c fig. 1 . 8 v .4 : efficienc y vs. load curr ent and amb i e n t temperatur e f o r qme48t 4001 8 c onvert e r mo unte d horiz ontal l y w i t h vin = 48 v and air fl o w i n g from pi n 1 t o pin 3 at a rate of 200 lf m (1.0 m/s). z d -020 57 rev . 4.1 www. power-o ne.com page 18 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 72 v 48 v 36 v fig. 1 . 8 v .5 : po w e r d i ssip a tio n vs. load curr ent an d inp u t voltag e for qme48t 40018 co nvert e r mounte d horiz ontal l y w i t h air flo w i n g from pin 1 to p i n 3 at a rate of 300 lf m (1.5 m/s) and t a = 25 c. fig. 1 . 8 v .7 : t u rn-o n transi e nt at full rate d loa d curre nt (resistive) w i t h no outp u t capac itor at vi n = 48 v, trigger ed vi a on/of f pin. t op trace: on/of f signal (5 v/div.). bott om trace: out pu t vo l t ag e (1 v/d i v.). t i me scale: 2 ms/div. load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 70 c 55 c 40 c fig. 1 . 8 v .6 : po w e r diss ipa t ion vs. loa d current an d ambi ent tem peratur e for qme48t 40018 co nverter mounte d horiz ontal l y w i t h vin = 48 v and air flo w i ng fro m pin 1 to pi n 3 a t a rate of 200 lf m (1.0 m/s). fig. 1 . 8 v .8 : t u rn-o n transie nt at full rated load curre nt (resistive) pl us 10,000 f at vin = 48 v, trigg e red vi a on/of f pin. t op trace: on /of f signal (5 v/div.). bottom trace: outp u t vo lta ge ( 1 v/div.). t i me scale: 2 ms/div. z d -020 57 rev . 4.1 www. power-o ne.com page 19 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output fig. 1 . 8 v .9 : output voltag e respo n se to l oad c u rrent step-cha n g e (2 0 a ? 30 a ? 20 a) at v i n = 48 v. t o p trace: outp u t voltag e (10 0 mv/div.). bottom trace: load current (1 0 a/div.). curre nt sle w rat e : 0.1 a/s. co = 1 f ceramic. t i me scale: 0.2 ms/div. f i g . 1.8v.11: output v o ltag e ri ppl e ( 20m v/div.) at fu ll rated l o a d curr ent int o a r e sis t ive lo ad w i th co = 1 0 f tantalum + 1 f ceramic an d vin = 48 v. t i me scale: 1 s/div. f i g . 1.8v.10: output volta g e respo n se to l oad c u rre nt step-cha n g e ( 20 a ? 30 a ? 20 a) at vin = 48 v. t op trace: outp u t v o ltag e (1 00 m v /div.). bottom trace: lo ad current (10 a/div.). current sle w rate: 5 a/s. co = 470 f pos + 1 f ceramic. t i me scale: 0.2 ms/div. vo u t v source i s i c 1 f ce r a mi c capa ci tor 10 h sou r ce indu cta n ce dc / d c co n v erter 33 f es r <1 electrol ytic capa ci tor ? qme seri es f i g . 1.8v.12: t e st setup for measur in g i n put refl ected rippl e curre nts, i c and i s . z d -020 57 rev . 4.1 www. power-o ne.com page 20 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output f i g . 1.8v.13: input r e fle c ted ri ppl e current, i c (100 ma/d iv.), measur ed at i nput termi na ls at full r a ted loa d curre nt a nd vin = 4 8 v. refer to f i g. 1.8v.12 for test setup. t i me scale: 1 s/div. f i g . 1.8v.15: output voltage vs. lo ad cu rre n t sh o w ing current limit p o int an d conv erter shutdo wn poi nt. input voltag e h a s almost no effect on current lim it character i stic. f i g . 1.8v.14: input r e fle c ted ri ppl e current, i s (10 ma/div.), measur ed thro ugh 10 h at t he so urce at full rate d l o a d curre nt an d vin = 48 v . refer to f i g. 1.8v.12 fo r test setup. t i me scale: 1 s/ d iv. f i g . 1.8v.16: load curre nt (top trace, 20 a/div., 50 ms/div.) int o a 10 m ? s h ort circuit duri ng rest art, at vin = 48 v. bottom trace (20 a/div., 2 ms/div.) is an expa nsio n of the on-time p o rti on of the top trace. z d -020 57 rev . 4.1 www. power-o ne.com page 21 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output am b i e n t t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 load curr ent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 5 v .1 : avail a b l e lo ad c u rrent vs . ambi ent a i r temperatur e an d airflo w r a tes for qme48t 40015 co nverter w i t h g hei ght pins mou n ted verticall y w i t h air flo w i n g fro m pin 1 to pi n 3, mosf et temperatur e 12 0 c, vin = 48 v. note : nc ? nat u ral con v e c tio n load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi cien cy 0. 60 0. 65 0. 70 0. 75 0. 80 0. 85 0. 90 0. 95 72 v 48 v 36 v fig. 1 . 5 v .3 : efficienc y vs. l oad c u rrent a n d in put volta g e for qme48t 40015 c onv erter mounte d h o riz ontal l y w i th air flo w in g from pi n 1 to pi n 3 at a rate of 3 00 lf m (1.5 m/s) and t a = 25 c. a mbie nt t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 lo ad c u rrent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 5 v .2 : avail abl e l o a d curre nt vs. ambi ent air temperatur e an d airflo w r a tes for qme48t 40015 co nverte r w i t h g heig h t pins mo unte d horiz ontal l y w i t h air flo w i n g from pin 1 to pin 3, mosf et temperature 1 20 c, vin = 48 v. load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi ci enc y 0. 60 0. 65 0. 70 0. 75 0. 80 0. 85 0. 90 0. 95 70 c 55 c 40 c fig. 1 . 5 v .4 : efficienc y vs. load curr ent and amb i e n t temperatur e f o r qme48t 4001 5 c onvert e r mo unte d horiz ontal l y w i t h vin = 48 v and air fl o w i n g from pi n 1 t o pin 3 at a rate of 200 lf m (1.0 m/s). z d -020 57 rev . 4.1 www. power-o ne.com page 22 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 72 v 48 v 36 v fig. 1 . 5 v .5 : po w e r d i ssip a tio n vs. load curr ent an d inp u t voltag e for qme48t 40015 co nvert e r mounte d horiz ontal l y w i t h air flo w i n g from pin 1 to p i n 3 at a rate of 300 lf m (1.5 m/s) and t a = 25 c. fig. 1 . 5 v .7 : t u rn-o n transi e nt at full rate d loa d curre nt (resistive) w i t h no outp u t capac itor at vi n = 48 v, trigger ed vi a on/of f pin. t op trace: on/of f signal (5 v/div.). bott om trace: out pu t vo l t ag e (1 v/d i v.). t i me scale: 2 ms/div. load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 70 c 55 c 40 c fig. 1 . 5 v .6 : po w e r diss ipa t ion vs. loa d current an d ambi ent tem peratur e for qme48t 40015 co nverter mounte d horiz ontal l y w i t h vin = 48 v and air flo w i ng fro m pin 1 to pi n 3 a t a rate of 200 lf m (1.0 m/s). fig. 1 . 5 v .8 : t u rn-o n transie nt at full rated load curre nt (resistive) pl us 10,000 f at vin = 48 v, trigg e red vi a on/of f pin. t op trace: on /of f signal (5 v/div.). bottom trace: outp u t vo lta ge ( 1 v/div.). t i me scale: 2 ms/div. z d -020 57 rev . 4.1 www. power-o ne.com page 23 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output fig. 1 . 5 v .9 : output voltag e respo n se to l oad c u rrent step-cha n g e (2 0 a ? 30 a ? 20 a) at v i n = 48 v. t o p trace: outp u t voltag e (10 0 mv/div.). bottom trace: load current (1 0 a/div.). curre nt sle w rat e : 0.1 a/s. co = 1 f ceramic. t i me scale: 0.2 ms/div. f i g . 1.5v.11: output volta g e ripp le (2 0 mv /div.) at full rated l o a d curr ent int o a r e sis t ive lo ad w i th co = 1 0 f tantalum + 1 f ceramic an d vin = 48 v. t i me scale: 1 s/div. f i g . 1.5v.10: output volta g e respo n se to l oad c u rre nt step-cha n g e ( 20 a ? 30 a ? 20 a) at vin = 48 v. t op trace: outp u t v o ltag e (1 00 m v /div.). bottom trace: lo ad current (1 0 a / div.). current sle w r a te: 5 a /s. co = 470 f pos + 1 f ceramic. t i me scale: 0.2 ms/div. vo u t v source i s i c 1 f ce r a mi c capa ci tor 10 h sou r ce indu cta n ce dc / d c co n v erter 33 f es r <1 electrol ytic capa ci tor ? qme seri es f i g . 1.5v.12: t e st setup for measuri ng in put reflecte d rippl e curre nts, i c and i s . z d -020 57 rev . 4.1 www. power-o ne.com page 24 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output f i g . 1.5v.13: input r e fle c ted ri ppl e current, i c (100 ma/d iv.), measur ed at i nput termi na ls at full r a ted loa d curre nt a nd vin = 4 8 v. refer to f i g. 1.5v.12 for test setup. t i me scale: 1 s/div. f i g . 1.5v.15: output voltage vs. lo ad cu rre n t sh o w ing current limit p o int an d conv erter shutdo wn poi nt. input voltag e h a s almost no effect on current lim it character i stic. f i g . 1.5v.14: input r e fle c ted ri ppl e current, i s (10 ma/div.), measur ed thro ugh 10 h at t he so urce at full rate d l o a d curre nt an d vin = 48 v . refer to f i g. 1.5v.12 fo r test setup. t i me scale: 1 s/ d iv. f i g . 1.5v.16: load curre nt (top trace, 20 a/div., 50 ms/div.) int o a 10 m ? s h ort circuit duri ng rest art, at vin = 48 v. bottom trace (20 a/div., 2 ms/div.) is an expa nsio n of the on-time p o rti on of the top trace. z d -020 57 rev . 4.1 www. power-o ne.com page 25 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output am b i e n t t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 load curr ent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 2 v .1 : avail a b l e lo ad c u rrent vs . ambi ent a i r temperatur e an d airflo w r a tes for qme48t 40012 co nverter w i t h g hei ght pins mou n ted verticall y w i t h air flo w i n g fro m pin 1 to pi n 3, mosf et temperatur e 12 0 c, vin = 48 v. note : nc ? nat u ral con v e c tio n load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi cien cy 0. 60 0. 65 0. 70 0. 75 0. 80 0. 85 0. 90 72 v 48 v 36 v fig. 1 . 2 v .3 : efficienc y vs. l oad c u rrent a n d in put volta g e for qme48t 40012 c onv erter mounte d h o riz ontal l y w i th air flo w in g from pi n 1 to pi n 3 at a rate of 3 00 lf m (1.5 m/s) and t a = 25 c. a mbie nt t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 lo ad c u rrent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 2 v .2 : avail abl e l o a d curre nt vs. ambi ent air temperatur e an d airflo w r a tes for qme48t 40012 co nverte r w i t h g heig h t pins mo unte d horiz ontal l y w i t h air flo w i n g from pin 1 to pin 3, mosf et temperature 1 20 c, vin = 48 v. load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi ci enc y 0. 60 0. 65 0. 70 0. 75 0. 80 0. 85 0. 90 70 c 55 c 40 c fig. 1 . 2 v .4 : efficienc y vs. load curr ent and amb i e n t temperatur e f o r qme48t 4001 2 c onvert e r mo unte d horiz ontal l y w i t h vin = 48 v and air fl o w i n g from pi n 1 t o pin 3 at a rate of 200 lf m (1.0 m/s). z d -020 57 rev . 4.1 www. power-o ne.com page 26 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 72 v 48 v 36 v fig. 1 . 2 v .5 : po w e r d i ssip a tio n vs. load curr ent an d inp u t voltag e for qme48t 40012 co nvert e r mounte d horiz ontal l y w i t h air flo w i n g from pin 1 to p i n 3 at a rate of 300 lf m (1.5 m/s) and t a = 25 c. fig. 1 . 2 v .7 : t u rn-o n transi e nt at full rate d loa d curre nt (resistive) w i t h no outp u t capac itor at vi n = 48 v, trigger ed vi a on/of f pin. t op trace: on/of f signal (5 v/div.). bott om trace: out pu t vo l t ag e (1 v/d i v.). t i me scale: 2 ms/div. load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 70 c 55 c 40 c fig. 1 . 2 v .6 : po w e r diss ipa t ion vs. loa d current an d ambi ent tem peratur e for qme48t 40012 co nverter mounte d horiz ontal l y w i t h vin = 48 v and air flo w i ng fro m pin 1 to pi n 3 a t a rate of 200 lf m (1.0 m/s). fig. 1 . 2 v .8 : t u rn-o n transie nt at full rated load curre nt (resistive) pl us 10,000 f at vin = 48 v, trigg e red vi a on/of f pin. t op trace: on /of f signal (5 v/div.). bottom trace: outp u t vo lta ge ( 1 v/div.). t i me scale: 2 ms/div. z d -020 57 rev . 4.1 www. power-o ne.com page 27 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output fig. 1 . 2 v .9 : output voltag e respo n se to l oad c u rrent step-cha n g e (2 0 a ? 30 a ? 20 a) at v i n = 48 v. t o p trace: outp u t voltag e (10 0 mv/div.). bottom trace: load current (1 0 a/div.). curre nt sle w rat e : 0.1 a/s. co = 1 f ceramic. t i me scale: 0.2 ms/div. f i g . 1.2v.11: output volta g e ripp le (2 0 mv /div.) at full rated l o a d curr ent int o a r e sis t ive lo ad w i th co = 1 0 f tantalum + 1 f ceramic an d vin = 48 v. t i me scale: 1 s/div. f i g . 1.2v.10: output volta g e respo n se to l oad c u rre nt step-cha n g e ( 20 a ? 30 a ? 20 a) at vin = 48 v. t op trace: outp u t v o ltag e (1 00 m v /div.). bottom trace: lo ad current (10 a/div.). current sle w rate: 5 a/s. co = 470 f pos + 1 f ceramic. t i me scale: 0.2 ms/div. vo u t v source i s i c 1 f ce r a mi c capa ci tor 10 h sou r ce indu cta n ce dc / d c co n v erter 33 f es r <1 electrol ytic capa ci tor ? qme seri es f i g . 1.2v.12: t e st setup for measur in g i n put refl ected rippl e curre nts, i c and i s . z d -020 57 rev . 4.1 www. power-o ne.com page 28 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output f i g . 1.2v.13: input r e fle c ted ri ppl e current, i c (100 ma/d iv.), measur ed at i nput termi na ls at full r a ted loa d curre nt a nd vin = 4 8 v. refer to f i g. 1.2v.12 for test setup. t i me scale: 1 s/div. f i g . 1.2v.15: output voltage vs. lo ad cu rre n t sh o w ing current limit p o int an d conv erter shutdo wn poi nt. input voltag e h a s almost no effect on current lim it character i stic. f i g . 1.2v.14: input r e fle c ted ri ppl e current, i s (10 ma/div.), measur ed thro ugh 10 h at t he so urce at full rate d l o a d curre nt an d vin = 48 v . refer to f i g. 1.2v.12 fo r test setup. t i me scale: 1 s/ d iv. f i g . 1.2v.16: load curre nt (top trace, 20 a/div., 50 ms/div.) int o a 10 m ? s h ort circuit duri ng rest art, at vin = 48 v. bottom trace (20 a/div., 5 ms/div.) is an expa nsio n of the on-time p o rti on of the top trace. z d -020 57 rev . 4.1 www. power-o ne.com page 29 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output am b i e n t t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 load curr ent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 0 v .1 : avail a b l e lo ad c u rrent vs . ambi ent a i r temperatur e an d airflo w r a tes for qme48t 40010 co nverter w i t h g hei ght pins mou n ted verticall y w i t h air flo w i n g fro m pin 1 to pi n 3, mosf et temperatur e 12 0 c, vin = 48 v. note : nc ? nat u ral con v e c tio n load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi cien cy 0. 50 0. 60 0. 70 0. 80 0. 90 72 v 48 v 36 v fig. 1 . 0 v .3 : efficienc y vs. l oad c u rrent a n d in put volta g e for qme48t 40010 c onv erter mounte d h o riz ontal l y w i th air flo w in g from pi n 1 to pi n 3 at a rate of 3 00 lf m (1.5 m/s) and t a = 25 c. a mbie nt t e m p er atu r e [ c ] 20 30 40 50 60 70 80 90 lo ad c u rrent [a dc] 0 10 20 30 40 50 50 0 l f m (2 .5 m/ s) 40 0 l f m (2 .0 m/ s) 30 0 l f m (1 .5 m/ s) 20 0 l f m (1 .0 m/ s) 10 0 l f m (0 .5 m/ s) n c - 30 lf m ( 0 .1 5 m / s) fig. 1 . 0 v .2 : avail abl e l o a d curre nt vs. ambi ent air temperatur e an d airflo w r a tes for qme48t 40010 co nverte r w i t h g heig h t pins mo unte d horiz ontal l y w i t h air flo w i n g from pin 1 to pin 3, mosf et temperature 1 20 c, vin = 48 v. load c u rr en t [ a dc] 0 8 16 24 32 40 4 8 effi ci enc y 0. 65 0. 70 0. 75 0. 80 0. 85 70 c 55 c 40 c fig. 1 . 0 v .4 : efficienc y vs. load curr ent and amb i e n t temperatur e f o r qme48t 4001 0 c onvert e r mo unte d horiz ontal l y w i t h vin = 48 v and air fl o w i n g from pi n 1 t o pin 3 at a rate of 200 lf m (1.0 m/s). z d -020 57 rev . 4.1 www. power-o ne.com page 30 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 72 v 48 v 36 v fig. 1 . 0 v .5 : po w e r d i ssip a tio n vs. load curr ent an d inp u t voltag e for qme48t 40010 co nvert e r mounte d horiz ontal l y w i t h air flo w i n g from pin 1 to p i n 3 at a rate of 300 lf m (1.5 m/s) and t a = 25 c. fig. 1 . 0 v .7 : t u rn-o n transi e nt at full rate d loa d curre nt (resistive) w i t h no outp u t capac itor at vi n = 48 v, trigger ed vi a on/of f pin. t op trace: on/of f signal (5 v/div.). bott om trace: out pu t vo l t ag e (1 v/d i v.). t i me scale: 2 ms/div. load c u rrent [a dc] 0 8 16 24 32 40 48 p ow er di ss i pa ti on [w] 0.00 3.00 6.00 9.00 12.00 15.00 70 c 55 c 40 c fig. 1 . 0 v .6 : po w e r diss ipa t ion vs. loa d current an d ambi ent tem peratur e for qme48t 40010 co nverter mounte d horiz ontal l y w i t h vin = 48 v and air flo w i ng fro m pin 1 to pi n 3 a t a rate of 200 lf m (1.0 m/s). fig. 1 . 0 v .8 : t u rn-o n transie nt at full rated load curre nt (resistive) pl us 10,000 f at vin = 48 v, trigg e red vi a on/of f pin. t op trace: on /of f signal (5 v/div.). bottom trace: outp u t vo lta ge ( 1 v/div.). t i me scale: 2 ms/div. z d -020 57 rev . 4.1 www. power-o ne.com page 31 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output fig. 1 . 0 v .9 : output voltag e respo n se to l oad c u rrent step-cha n g e (2 0 a ? 30 a ? 20 a) at v i n = 48 v. t o p trace: outp u t voltag e (10 0 mv/div.). bottom trace: load current (1 0 a/div.). curre nt sle w rat e : 0.1 a/s. co = 1 f ceramic. t i me scale: 0.2 ms/div. f i g . 1.0v.11: output volta g e ripp le (2 0 mv /div.) at full rated l o a d curr ent i n to a resis t ive lo ad w i th co = 1 0 f tantalum + 1 f ceramic an d vin = 48 v. t i me scale: 1 s/div. f i g . 1.0v.10: output volta g e respo n se to l oad c u rre nt step-cha n g e ( 20 a ? 30 a ? 20 a) at vin = 48 v. t op trace: outp u t v o ltag e (1 00 m v /div.). bottom trace: lo ad current (10 a/div.). current sle w rate: 5 a/s. co = 470 f pos + 1 f ceramic. t i me scale: 0.2 ms/div. vo u t v source i s i c 1 f ce r a mi c capa ci tor 10 h sou r ce indu cta n ce dc / d c co n v erter 33 f es r <1 electrol ytic capa ci tor ? qme seri es f i g . 1.0v.12: t e st setup for measuri ng in put reflecte d rippl e curre nts, i c and i s . z d -020 57 rev . 4.1 www. power-o ne.com page 32 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output f i g . 1.0v.13: input r e fle c ted ri ppl e current, i c (100 ma/d iv.), measur ed at i nput termi na ls at full r a ted loa d curre nt a nd vin = 4 8 v. refer to f i g. 1.0v.12 for test setup. t i me scale: 1 s/div. f i g . 1.0v.15: output voltage vs. lo ad cu rre n t sh o w ing current limit p o int an d conv erter shutdo wn poi nt. input voltag e h a s almost no effect on current lim it character i stic. f i g . 1.0v.14: input r e fle c ted ri ppl e current, i s (10 ma/div.), measur ed thro ugh 10 h at t he so urce at full rate d l o a d curre nt an d vin = 48 v . refer to f i g. 1.0v.12 fo r test setup. t i me scale: 1 s/ d iv. f i g . 1.0v.16: load curre nt (top trace, 20 a/div., 50 ms/div.) int o a 10 m ? s h ort circuit duri ng rest art, at vin = 48 v. bottom trace (20 a/div., 5 ms/div.) is an expa nsio n of the on-time p o rti on of the top trace. z d -020 57 rev . 4.1 www. power-o ne.com page 33 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output ph y s ical information qme48t pin out (th r oug h-hole ) side view top view 1 2 3 7 8 6 5 4 pad/pin connect ions pa d/pin # func tio n 1 v i n (+ ) 2 o n / o f f 3 v i n ( - ) 4 v o u t ( - ) 5 s e n s e ( - ) 6 t r i m 7 s e n s e ( + ) 8 v o u t (+ ) he ight o p tion ht ( max. hei g ht ) cl ( min. clea r an ce ) g 0 . 4 2 5 [1 0.80] 0.035 [0.8 9] pl pin le n g th pin o p ti on 0.005 [0.13] a 0 . 1 8 8 [4.7 8 ] b 0 . 1 4 5 [3.6 8 ] qme48t platform notes ? all dimensions ar e in inches [mm] ? pins 1-3 and 5-7 are ? 0.040 ? [1.0 2] w i th ? 0.0 78? [1.98] shoulder ? pins 4 and 8 are ? 0.062 ? [1.57] w i thout shoulder ? pin material & finish: brass alloy 360 w i th matte t i n over nickel ? converter weigh t: 1.2 oz [34.2 g] t y pical z d -020 57 rev . 4.1 www. power-o ne.com page 34 of 35
qm e48t40 dc-dc series data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40a output heat sin k o p tion ht ( max. hei g ht ) cl ( min. s1 0.99 [25.1] 0.039 [1.0 0] pl pin le n g th pin o p ti on 0.005 [0.13] b 0 . 1 4 5 [3.6 8 ] conv erter part num b eri ng ordering information produc t series inpu t vo ltag e mount ing scheme rated loa d current outp ut vo ltag e on/off logic max he ight [ht] pin le ngth [pl] sp ecial f eatu r e s r o h s h e a t s i n k q m e 4 8 t 4 0 0 3 3 - n g b 0 quarter- brick format 36-7 5 v t ? t h rough- hol e 40 adc 010 ? 1.0 v 012 ? 1.2 v 015 ? 1.5 v 018 ? 1.8 v 025 ? 2.5 v 033 ? 3.3 v n ? negative p ? positive t h rough hol e g ? 0.425? t h rough hol e a ? 0.188? b ? 0.145? 0 ? st d non- latchi ng l ? latchi ng option no suffix ? rohs lea d -sol der- exempti on compli ant g ? rohs compli ant for all si x substanc es no suffix ? no heatsi nk -s1 ? heatsi nk as sho w n example : the e x ample above d e scribes p/n qme48t40033 -n gb0: 36 -75 v in put, throug h-hole , 40 a @ 3.3 v output, negative on/ o f f logic, a 0.145? solder tail and ma ximum height of 0.425?, standa rd (non-latching) p r otection, and eut e ctic tin/lead solder. con sult factory for the complete list of available options. at t e n t i o n : the heatsink option ?s1? is only avail able w i th the mod e l qme48t4 003 3-n g bog-s1 notes : 1. nuclear an d medical appli c ations - po w e r- one p r oducts are not designed , intended for us e in, or autho rized for use as critical components in lif e support s y stem s, equipment used in hazardous e n vi ronments, or nuclear control sy st ems w i thout t he exp r ess w r itte n consent of the re specti ve divisional president of p o wer- one, inc. 2. technica l re visions - the a ppearance of pro ducts, including safet y ag enc y cert ifications pictured on labels, ma y change depe ndin g on the date ma n u factured. speci f ications are subject to change w i t hout notice. z d -020 57 rev . 4.1 www. power-o ne.com page 35 of 35

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