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| for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com/support uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 1 of 16 featuring a full 15 watt or greater output in one square inch of board area, the uei series isolated dc/dc converter family offers effcient regulated dc power for printed circuit board mounting. gate drive control reference, trim & error ampli?er +v in ?v in +v out ?v out on/off control trim isolation barrier isolation typical topology is shown. figure 1. simplifed block diagram3.3v and 5v o u t models only. typical unit features ? small footprint dc/dc converter, ideal for high current applications ? industry standard 0.96" x 1.1" x 0.32" open frame package and pinout ? wide range input voltages 9-36 and 18-75 vdc ? assembly and attachment for rohs standards ? isolation up to 2250 vdc (basic) ? up to 15 watts or greater total output power with overtemperature shutdown ? high effciency synchronous rectifer forward topology ? stable operation with no required external components ? usable -40 to 85c temperature range (with derating) ? certifed to ul 60950-1, can/csa-c22.2 no. 60950-1, iec60950-1, en60950-1 safety ap - provals, 2nd edition ? extensive self-protection shut down features product overview wide range 4:1 inputs on the 0.96" x 1.1" x 0.32" converter are either 9 to 36 volts dc (q12 models) or 18 to 75 volts dc (q48 models), ideal for battery- powered and telecom equipment. the industry- standard pinout fts larger 1" x 2" converters. fixed output voltages from 3.3 vdc to 15 vdc are regu - lated to within 0.2% or less and may be trimmed within 10% of nominal output. applications include small instruments, area-limited microcon - trollers, computer-based systems, data communi - cations equipment, remote sensor systems, vehicle and portable electronics. the uei 15w series includes full magnetic and optical isolation up to 2250 volts dc (basic insula - tion). for connection to digital systems, the outputs offer fast settling to current step loads and toler - ance of higher capacitive loads. excellent ripple and noise specifcations assure compatibility to circuits using cpus, asics, programmable logic and fpgas. for systems requiring controlled startup/shutdown, an external switch, transis - tor or digital logic may be used to activate the remote on/off control. a wealth of self-protection features avoid both converter and external circuit problems. these include input undervoltage lockout and overtem - perature shutdown. the outputs current limit using the hiccup autorestart technique and the outputs may be short-circuited indefnitely. additional features include output overvoltage and reverse conduction elimination. the high effciency offers minimal heat buildup and no fan operation. $
www.murata-ps.com/support part number structure uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 2 of 16 ? please refer to the part number structure for additional options and complete ordering part numbers. ? all specifcations are typical at nominal line voltage and full load, +25 deg.c. unless otherwise noted. see detailed specifcations. ? minimum output load for all models is 10% of maximum current. ? rohs-6 compliance does not claim eu rohs exemption 7b (lead in solder). performance specifications and ordering guide ? root models ? output input effciency open frame package C c75 v o u t (v) i o u t (a) ? power (w) r/n (mvp-p) ? regulation (max.) v i n nom. (v) range (v) i i n = no load (ma) i i n = full load (a) typ. max. line load min. typ. (inches) (mm) case pinout uei15-033-q12 3.3 4.5 14.85 60 90 0.05% 0.1% 24 9-36 43 0.71 86.5% 89% 1.10.960.32 27.924.48.1 p85 uei15-033-q48 3.3 5 16.5 60 90 0.2% 0.2% 48 18-75 24 0.4 85.5% 88% uei15-050-q12 5 3 15 70 125 0.05% 0.075% 24 9-36 41 0.72 86.3% 87.3% uei15-050-q48 5 3 15 60 95 0.05% 0.06% 48 18-75 28 0.36 84.3% 86.0% uei15-120-q12 12 1.3 15.6 110 150 0.05% 0.05% 24 9-36 15 0.77 82.3% 84.5% uei15-120-q48 12 1.3 15.6 85 120 0.0 75% 0.05% 48 18-75 15 0.38 83.3% 85% uei15-150-q12 15 1.1 16.5 130 175 0.05% 0.05% 24 9-36 18 0.81 83.5% 85% uei15-150-q48 15 1.1 16.5 80 120 0.05% 0.05% 48 18-75 14 0.4 83.3% 85.3% nominal output voltage in tenths of a volt unipolar wide input 15-watt series uei15 - q12 - - 033 p m on/off control polarity: p = positive n = negative surface mount option blank = standard through-hole pin mount version m = smt version (msl rating 2) c rohs-6 hazardous substance compliance (note 4) input voltage range q12 = 9-36v q48 = 18-75v note: some model number combinations may not be available. contact murata power solutions. lx pin length option blank = std. pin length 0.25? (6.3mm) l1 = 0.110? (2.79mm) l2 = 0.145? (3.68mm) alternate pin lengths require quantity order. } special model numbers: uei-31204-c, restricted avl and surface mount h conformal coating option blank = no coating, standard h = coating added, optional (built to order; contact murata power solutions for moq and lead times.) www.murata-ps.com/support uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 3 of 16 ? remove overload for recovery. miscellaneous characteristics model family current limit inception 98% of vout, after warmup a short circuit protection method short circuit current a short circuit duration (output shorted to ground) ? pre- biased setup calculated mtbf hours operating temperature range storage temperature range oc thermal protection/ shutdown oc see derating curves uei15-033-q12 6.0 current limiting, hiccup autorestart 0.3 continuous monotonic 2 x 10 6 C40 to +85oc C55 to +125 oc 115 uei15-033-q48 7.2 3.49 x 10 6 uei15-050-q12 4.6 2 x 10 6 uei15-050-q48 4.5 uei15-120-q12 2.0 uei15-120-q48 1.8 4.1 x 10 6 135 uei15-150-q12 1.6 2.1 x 10 6 115 uei15-150-q48 1.7 2 x 10 6 17 input characteristics model family start-up threshold v under - voltage shut - down v refected (back) ripple current ma pk-pk input current recom - mended fast-blow fuse a internal input filter type reverse polarity protec - tion remote on/off control inrush transient a 2 sec min. load ma output short circuit ma low line a standby mode ma on/off current ma positive logic blank model suffx negative logic "n" model suffx uei15-033-q12 9.1 8.6 30 0.05 100 50 1.86 1 4 c none. install external fuse. see note 15. 1 off=gnd pin or C0.7 to +0.7v max. on=open pin or +10 to +15v max. off=open pin or +10 to + 15v max. on=gnd pin or C0.7 to +0.8v max. uei15-033-q48 16.7 15.6 65 1.03 2 uei15-050-q12 9.5 8.5 105 1.90 4 uei15-050-q48 16.7 15.6 60 0.96 2 l uei15-120-q12 9.5 8.4 110 2.04 4 c uei15-120-q48 16.7 15.6 56 1.02 1.5 uei15-150-q12 9.5 8.4 130 2.13 4 uei15-150-q48 16.7 16.2 60 1.06 2 output characteristics model family i o u t max. ma v o u t accuracy 50% load % of v n o m adjustment range % of v n o m temperature coeffcient % of v o u t /oc capacitive loading max. low esr <0.02? max, f overvoltage protection v ov protection method voltage out - put range ripple/noise (20 mhz bandwidth) 8 line/load regulation effciency uei15-033-q12 see ordering guide (minimum load is 10% of imax) 1 10 0.02 1,000 4.5 magnetic feedback see ordering guide uei15-033-q48 3.9 uei15-050-q12 5.9 uei15-050-q48 470 5.9 uei15-120-q12 14.1 uei15-120-q48 15 uei15-150-q12 19.5 uei15-150-q48 20 isolation characteristics model family input to output min. vdc isolation resistance min. m? isolation capacitance pf isolation safety rating uei15-033-q12 2000 10 1000 basic insulation uei15-033-q48 2250 10 1500 uei15-050-q12 2000 10 1500 uei15-050-q48 2250 10 1000 uei15-120-q12 2000 10 1000 uei15-120-q48 2250 10 1000 uei15-150-q12 2000 10 1500 uei15-150-q48 2250 10 1000 18 19 dynamic characteristics model family dynamic load response (50-75-50% load step) sec to 1% v o u t ? peak deviation mv start-up time switching frequency khz v i n to v o u t regulated (max.) msec remote on/off to v o u t regulated max.) msec uei15-033-q12 150 125 50 50 350 uei15-033-q48 100 35 350 uei15-050-q12 60 350 uei15-050-q48 30 375 uei15-120-q12 150 150 340 uei15-120-q48 100 200 350 uei15-150-q12 125 340 uei15-150-q48 175 380 www.murata-ps.com/support uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 4 of 16 absolute maximum ratings absolute maximums are stress ratings. exposure of devices to greater than any of these conditions may adversely affect long-term reliability. proper operation under conditions other than those listed in the performance/functional specif - cations is neither implied nor recommended. (4) mean time before failure is calculated using the telcordia (belcore) sr- 332 method 1, case 3, ground fxed conditions, tpcboard=+25 deg.c, full load, natural air convection. (5) the on/off control is normally controlled by a switch. but it may also be driven with external logic or by applying appropriate external voltages which are referenced to input common. the on/off control input should use either an open collector or open drain transistor. (6) output current limiting begins when the output voltage degrades approximately 2% from the selected setting. (7) the outputs are not intended to sink appreciable reverse current. this may damage the outputs. (8) output noise may be further reduced by adding an external flter. see i/o filtering and noise reduction. (9) all models are fully operational and meet published specifcations, including cold start at C40c. (10) regulation specifcations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) the output overvoltage protection is automatic recovery after fault removal. the overvoltage may occur either from internal failure or from an external forcing voltage as in a shared power system. (12) output current limit and short circuit protection is non-latching. when the overcurrent fault is removed, the converter will immediately recover. (13) do not exceed maximum power specifcations when adjusting the output trim. (14) at zero output current, the output may contain low frequency com - ponents which exceed the ripple specifcation. the output may be operated indefnitely with no load. (15) if reverse polarity is accidentally applied to the input, to ensure reverse input protection with full output load, always connect an external input fuse in series with the +v in input. use approximately twice the full input current rating with nominal input voltage. (16) hiccup operation repeatedly attempts to restart the converter with a brief, full-current output. if the overcurrent condition still exists, the restart current will be removed and then tried again. this short current pulse prevents overheating and damaging the converter. once the fault is removed, the con - verter immediately recovers normal operation. (17) on model uei15-050-q48, if v in <20v, output trim may only be adjusted downwards from +5.0v (more negative). (18) shown at vin = 10v. caution: this product is not internally fused. to comply with safety agency certifcations and to avoid injury to personnel or equipment, the user must connect an external fast-blow fuse to the input terminals. see fuse information. (19) all models require 10% of imax minimum output load to meet specif - cations. however, they will not be damaged at zero output load. specification notes (1) all models are tested and specifed with external capacitors listed in the table below. the external capacitors listed below are only for establishing test specifcations. they are required for our test fxtures and equipment. your applica - tion may not need them. the converter is stable with no external capacitors but murata power solutions strongly recommends external caps. all caps are low-esr types. where two or more capacitors are listed, these are connected in parallel. all caps should mount close to the dc/dc using short leads. all specifcations are typical unless noted. general conditions for specifca - tions are +25 deg.c, v in =nominal, v o u t =nominal, full load. adequate airfow must be supplied for extended testing under power. (2) input ripple current is tested and specifed over a 5 hz to 20 mhz band - width. input fltering is c in =33 f, 100v tantalum, c b u s =220 f, 100v electro - lytic, l b u s =12 h. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower airfow, the dc/dc converter will tolerate brief full current outputs if the total rms current over time does not exceed the derating curve. all derating curves are presented at sea level altitude. be aware of reduced power dissipation with increasing density altitude. absolute maximum ratings input voltage q12 models volts max. continuous 36 vdc volts, transient 100ms 50 vdc q48 models volts max. continuous 75 vdc volts, transient 100ms 100 vdc on/off control, referred to Cv in volts, min. C0.3 volts, max. 15 input reverse polarity protection see fuse section output overvoltage, volts max. v o u t nom. +20% output current, sustained short circuit current-limited, see specs storage temperature range, min. oc -55 max. oc +125 input/output external test capacitors model input capacitor output capacitor(s) uei15-033-q12 100 f 1 f & 10 f uei15-033-q48 4.7 f ceramic 1 f & 10 f uei15-050-q12 100 f 1 f & 10 f uei15-050-q48 4.7 f ceramic 1 f & 10 f uei15-120-q12 100 f 1 f & 10 f uei15-120-q48 4.7 f ceramic 1 f & 10 f uei15-150-q12 100 f 1 f & 10 f uei15-150-q48 4.7 f ceramic 1 f & 10 f www.murata-ps.com/support mechanical specifications, open frame 0.32 max 8.1 0.41 .30 typ 0.400 10.16 0.15 0.58 side view moun tin g plane .040 .002 .071 .002 shoulder 6x at pins 1-6 c l bottom view # 5 # 4 # 3 c l c l # 6 # 2 # 1 recommen de d pri-sec barrier 0.400 10.16 0.400 10.16 0.100 2.54 0.200 5.08 0.800 20.32 top view pin # 1 1.10 27.9 0.96 24.4 end view 0.475 ref 0.25 6.3 uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 5 of 16 input/output connections pin function p85 positie in egatie in positie out output ri 5 egatie out onoff ontrol he eote onoff can e proided with either positie p suf or nega tie suf polarit physical characteristics pin material copper alloy pin diameter 0.04? (1.016mm) pin finish gold plate weight 0.352 oz./10 grams electromagnetic interference en55022/cispr22 (see note 1) (requires external flter) flammability rating ul 94v-0 safety certifed to ul/cul 60950-1, can/csa-c22.2-60950-1, iec/en 60950-1, 2nd edition case 75 third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 1? standard pin length is shown. please refer to the ordering guide for alternate pin lengths. s e c t i on a - a depth pocket 9.5 [.38 in] 19. 1 [ .75 in ] n otes : ma ter ial : d ow 220 an t is ta t eth af oa m 1 . (d e nsi ty: 34 - 35 kg / m3 ) d imen s ion s : 252 x 252 x 19.1 m m 2 . 6 x 5 a rra y ( 30 per tra y) 3. a ll d imens ions in millimeters [inches] 4. tol era nces unl e ss other wis e s pec i? ed : +1 /-0 ty p ty p r 28. 4 177. 8 [9.9 2] 252. 0 ty p 6. 4 ty p 6. 4 6. 4 ty p 18. 0 5x ref 38. 1 22. 9 190. 5 ref 252. 0 [9.9 2] 25. 4 4x 44. 5 a a 19. 1 ref 252. 0 ref 252. 0 ref 9. 5 d ee p ref www.murata-ps.com/support shipping trays and boxes, through-hole mount shipping tray dimensions uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 6 of 16 anti-static foam label label each tray is 6 x 5 units (30 units per tray) uei modules are supplied in a 30-piece (6 x 5) shipping tray. the tray is an anti-static closed-cell polyethylene foam. dimensions are shown below. www.murata-ps.com/support mechanical specifications, surface mount package (msl rating 2) 0.400 10.16 0.13 ref 0.34 max top view pin # 1 1.10 27.9 0.96 24.4 c l bottom view # 5 # 4 # 3 c l c l # 6 # 2 # 1 0.400 10.16 0.400 10.16 0.800 20.32 0.100 2.54 0.100 2.54 end view .093 side view moun tin g plane .093 typ uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 7 of 16 third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 1? input/output connections pin function 1 positive vin 2 negative vin 3 positive vout 4 output trim 5 negative vout 6 on/off control* *the remote on/off can be provided with either positive (p suffx) or nega - tive (n suffx) polarity www.murata-ps.com/support 1.14 29.0 .010 .102 0.25 2.60 10.16 0.400 0.400 10.16 2.54 0.100 2.54 20.32 0.800 6 x 0.100 1.00 25.4 1 2 6 4 5 3 c l c l recommend ed s mt pad layout dimensions in inches [mm] note: the smt package has an msl 2 rating. mechanical specifications, surface mount package surface mount tape and reel information (msl rating 2) uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 8 of 16 0.909 23.10 32.00 1.260 2.00 0.079 0.118 3.00 13.0 r.256 directi on of f eed 5.0mm pick & p lace locat io n packaging co nfo rms to eia-481 co nverters shipping in q uantities of 100 per reel 2.20 56.0 co ver tape 0.365 9.27 s urfa ce mount ta pe a nd reel www.murata-ps.com/support performance data uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 9 of 16 maximum current temperature derating @sea level (v in = 24v, airfow from input to output) maximum current temperature derating @sea level (v in = 48v, airfow from input to output) maximum current temperature derating @sea level (v in = 12v or 24v, airfow from input to output) effciency vs. line voltage and load current @ 25c effciency vs. line voltage and load current @ 25c uei15-033-q12 uei15-033-q48 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 0 0 . 5 1 1 . 5 2 2 . 5 3 3 . 5 4 l o a d current ( a mps) e f ? c i e n c y ( % ) vin = 24 v vin = 36 v vin = 9 v vin = 18 v 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 9 0 l o a d current ( a mps) e f ? c i e n c y ( % ) 1 2 3 4 5 vin = 75 v vin = 18 v vin = 48 v uei15-033-q48 3 . 5 0 3 . 7 0 3 . 9 0 4 . 1 0 4 . 3 0 4 . 5 0 4 . 7 0 4 . 9 0 5 . 1 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 a m b i e n t t e m p e r a tu r e (c) o u tp u t current (a mps) n a tural convection 100 l f m 200 l f m 300 l f m 3 . 8 0 4 . 0 0 4 . 2 0 4 . 4 0 4 . 6 0 4 . 8 0 5 . 0 0 5 . 2 0 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 a m b i e n t te m p e r a tu r e (c) o u t p u t current ( a mps) n a tural convection 100 l f m 200 l f m 300 l f m 400 l f m 2 .0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 a m b i e n t te m p e r a tu r e (c) o u t p u t current ( a mps) n a tural convection www.murata-ps.com/support performance data maximum current temperature derating @sea level (v in = 24v, airfow is from pin 1 to pin 3) 0 0 . 5 1 1 . 5 65 lfm ambient temperature (c) o u t p u t c u r r e n t ( a m p s ) 20 25 35 45 55 65 75 30 40 50 60 70 80 85 maximum current temperature derating @sea level (v in = 24v, airfow is from pin 1 to pin 3) 0 1 2 3 4 20 25 35 45 55 65 75 30 40 50 60 70 80 85 65 lfm ambient temperature (c) o u t p u t c u r r e n t ( a m p s ) uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 10 of 16 effciency vs. line voltage and load current @ 25c uei15-050-q48 l o a d current ( a mps) e f ? c i e n c y ( % ) 100 90 80 70 60 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 vin = 36 v vin = 75 v vin = 18 v vin = 24 v maximum current temperature derating @sea level (v in = 24v or 48v, airfow is from input to output) 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 2.50 2.60 2.70 2.80 2.90 3.00 3.10 3.20 ambient temperature (c) o u t p u t c u r r e n t ( a m p s ) n a tural convection effciency vs. line voltage and load current @ 25c uei15-050-q12 l o a d current ( a mps) e f ? c i e n c y ( % ) 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 2 5 0 . 5 0 . 7 5 1 1 . 2 5 1 . 5 1 . 7 5 2 2 . 2 5 2 . 5 2 . 7 5 3 vin = 24 v vin = 36 v vin = 9 v vin = 18 v effciency vs. line voltage and load current @ 25c uei15-120-q12 l o a d current ( a mps) e f ? c i e n c y ( % ) 60 65 70 75 80 8 5 9 0 0 . 1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 vin = 24 v vin = 36 v vin = 9 v vin = 18 v www.murata-ps.com/support performance data effciency vs. line voltage and load current @ 25c uei15-120-q48 maximum current temperature derating @sea level (v in = 24v or 48v, airfow is from pin 2 to pin 1) l o a d current ( a mps) e f ? c i e n c y ( % ) 0 . 2 0 . 3 0 . 4 0 . 5 0 . 6 0 . 7 0 . 8 0 . 9 1 1 . 1 1 . 2 1 . 3 7 0 7 2 7 4 7 6 7 8 8 0 8 2 8 4 8 6 8 8 9 0 vin = 48 v vin = 75 v vin = 18 v vin = 24 v ambient temperature (c) o u t p u t c u r r e n t ( a m p s ) 0 . 5 0 . 6 0 . 7 0 . 8 0 . 9 1 . 0 1 . 1 1 . 2 1 . 3 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 n a tural convection effciency vs. line voltage and load current @ 25c effciency vs. line voltage and load current @ 25c uei15-150-q12 maximum current temperature derating @sea level (v in = 12v and 24v, airfow is from input to output) maximum current temperature derating @sea level (v in = 24v and 48v, airfow is from input to output) l o a d current ( a mps) e f ? c i e n c y ( % ) 7 4 7 6 7 8 8 0 8 2 8 4 8 6 8 8 9 0 0 . 1 0 . 2 0 . 3 0 . 4 0 . 5 0 . 6 0 . 7 0 . 8 0 . 9 1 1 . 1 vin = 24 v vin = 36 v vin = 9 v l o a d current ( a mps) e f ? c i e n c y ( % ) 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 0 . 0 7 0 . 1 8 0 . 2 8 0 . 3 8 0 . 4 9 0 . 5 9 0 . 6 9 0 . 8 0 0 . 9 0 1 . 0 0 1 . 1 0 vin = 24 v vin = 48 v vin = 75 v vin = 18 v uei15-150-q48 ambient temperature (c) o u t p u t c u r r e n t ( a m p s ) 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 40 45 50 55 60 65 70 75 80 85 n a tural convection ambient temperature (c) o u t p u t c u r r e n t ( a m p s ) 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 40 45 50 55 60 65 70 75 80 85 n a tural convection uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 11 of 16 www.murata-ps.com/support uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 12 of 16 technical notes input fusing certain applications and/or safety agencies may require fuses at the inputs of power conversion components. fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. for greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. the installer must observe all relevant safety standards and regulations. for safety agency approvals, install the converter in compliance with the end-user safety standard, i.e. iec/en/ul 60950-1. input reverse-polarity protection if the input voltage polarity is reversed, an internal diode will become forward biased and likely draw excessive current from the power source. if this source is not current-limited or the circuit appropriately fused, it could cause perma - nent damage to the converter. input under-voltage shutdown and start-up threshold under normal start-up conditions, converters will not begin to regulate properly until the ramping-up input voltage exceeds and remains at the start-up threshold voltage (see specifcations). once operating, converters will not turn off until the input voltage drops below the under-voltage shutdown limit. subsequent restart will not occur until the input voltage rises again above the start-up threshold. this built-in hysteresis prevents any unstable on/off opera - tion at a single input voltage. users should be aware however of input sources near the under-voltage shutdown whose voltage decays as input current is consumed (such as capaci - tor inputs), the converter shuts off and then restarts as the external capacitor recharges. such situations could oscillate. to prevent this, make sure the oper - ating input voltage is well above the uv shutdown voltage at all times. start-up time assuming that the output current is set at the rated maximum, the v in to v out start-up time (see specifcations) is the time interval between the point when the ramping input voltage crosses the start-up threshold and the fully loaded regulated output voltage enters and remains within its specifed accuracy band. actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and fnal value of the input voltage as it appears at the converter. these converters include a soft start circuit to moderate the duty cycle of its pwm controller at power up, thereby limiting the input inrush current. the on/off remote control interval from on command to v out regulated assumes that the converter already has its input voltage stabilized above the start-up threshold before the on command. the interval is measured from the on command until the output enters and remains within its specifed accuracy band. the specifcation assumes that the output is fully loaded at maximum rated current. similar conditions apply to the on to v out regulated specifcation such as external load capacitance and soft start circuitry. input source impedance these converters will operate to specifcations without external components, assuming that the source voltage has very low impedance and reasonable in - put voltage regulation. since real-world voltage sources have fnite impedance, performance is improved by adding external flter components. sometimes only a small ceramic capacitor is suffcient. since it is diffcult to totally characterize all applications, some experimentation may be needed. note that external input capacitors must accept high speed switching currents. because of the switching nature of dc/dc converters, the input of these converters must be driven from a source with both low ac impedance and adequate dc input regulation. performance will degrade with increasing input inductance. excessive input inductance may inhibit operation. the dc input regulation specifes that the input voltage, once operating, must never degrade below the shut-down threshold under all load conditions. be sure to use adequate trace sizes and mount components close to the converter. i/o filtering, input ripple current and output noise all models in this converter series are tested and specifed for input refected ripple current and output noise using designated external input/output compo - nents, circuits and layout as shown in the fgures below. external input capaci - tors (cin in the fgure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient ir drops in the input conductors. users should select input capacitors for bulk capacitance (at appropriate frequencies), low esr and high rms ripple current ratings. in the fgure below, the cbus and lbus components simulate a typical dc voltage bus. your specifc system confguration may require additional considerations. please note that the values of cin, lbus and cbus will vary according to the specifc converter model. in critical applications, output ripple and noise (also referred to as periodic and random deviations or pard) may be reduced by adding flter elements such as multiple external capacitors. be sure to calculate component temperature rise from refected ac current dissipated inside capacitor esr. c in v in c bus l bus c in = 33f, esr < 700m @ 100khz c bus = 220f, esr < 100m @ 100khz l bus = 12h +input -input current probe to oscilloscope + ? + ? figure 2. measuring input ripple current in fgure 3, the two copper strips simulate real-world printed circuit imped - ances between the power supply and its load. in order to minimize circuit errors and standardize tests between units, scope measurements should be made using bnc connectors or the probe ground should not exceed one half inch and soldered directly to the fxture. floating outputs since these are isolated dc/dc converters, their outputs are foating with respect to their input. the essential feature of such isolation is ideal zero current flow between input and output. real-world converters however do exhibit tiny leakage currents between input and output (see specifcations). these leakages consist of both an ac stray capacitance coupling component www.murata-ps.com/support uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 13 of 16 and a dc leakage resistance. when using the isolation feature, do not allow the isolation voltage to exceed specifcations. otherwise the converter may be damaged. designers will normally use the negative output (-output) as the ground return of the load circuit. you can however use the positive output (+output) as the ground return to effectively reverse the output polarity. minimum output loading requirements these converters employ a synchronous rectifer design topology. models uei15-033-q12, uei15-120-q12, and uei15-050-q12 require 10% minimum load to meet specifcations. operation under less than 10% load may slightly increase regulation, ripple, and noise. thermal shutdown to prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. if environmental conditions cause the temperature of the dc/dcs to rise above the operating temperature range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. when the temperature decreases below the turn-on threshold, the converter will automatically restart. there is a small amount of hysteresis to prevent rapid on/off cycling. caution : if you operate too close to the thermal limits, the converter may shut down suddenly without warning. be sure to thoroughly test your application to avoid unplanned thermal shutdown. temperature derating curves the graphs in the next section illustrate typical operation under a variety of conditions. the derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airfow measured in linear feet per minute (lfm). note that these are average measurements. the converter will accept brief increases in temperature and/or current or reduced airfow as long as the aver - age is not exceeded. note that the temperatures are of the ambient airfow, not the converter itself which is obviously running at higher temperature than the outside air. also note that natural convection is defned as very fow rates which are not using fan-forced airfow. depending on the application, natural convection is usually about 30-65 lfm but is not equal to still air (0 lfm). mps makes characterization measurements in a closed cycle wind tunnel with calibrated airfow. we use both thermocouples and an infrared camera system to observe thermal performance. as a practical matter, it is quite diff - cult to insert an anemometer to precisely measure airfow in most applications. sometimes it is possible to estimate the effective airfow if you thoroughly un - derstand the enclosure geometry, entry/exit orifce areas and the fan fowrate specifcations. if in doubt, contact mps to discuss placement and measurement techniques of suggested temperature sensors. caution : if you routinely or accidentally exceed these derating guidelines, the converter may have an unplanned over temperature shut down. also, these graphs are all collected at slightly above sea level altitude. be sure to reduce the derating for higher density altitude. output overvoltage protection this converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. the signal is optically coupled to the pri - mary side pwm controller. if the output exceeds ovp limits, the sensing circuit will power down the unit, and the output voltage will decrease. after a time-out period, the pwm will automatically attempt to restart, causing the output volt - age to ramp up to its rated value. it is not necessary to power down and reset the converter for the this automatic ovp-recovery restart. if the fault condition persists and the output voltage climbs to excessive levels, the ovp circuitry will initiate another shutdown cycle. this on/off cycling is referred to as hiccup mode. it safely tests full current rated output voltage without damag - ing the converter. output fusing the converter is extensively protected against current, voltage and temperature extremes. however your output application circuit may need additional protec - tion. in the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. consider using an appropriate fuse in series with the output. output current limiting as soon as the output current increases to approximately 125% to 150% of its maximum rated value, the dc/dc converter will enter a current-limiting mode. the output voltage will decrease proportionally with increases in output current, thereby maintaining a somewhat constant power output. this is com - monly referred to as power limiting. current limiting inception is defned as the point at which full power falls below the rated tolerance. see the performance/functional specifcations. note particularly that the output current may briefy rise above its rated value. this enhances reliability and continued operation of your application. if the output current is too high, the converter will enter the short circuit condition. output short circuit condition when a converter is in current-limit mode, the output voltage will drop as the output current demand increases. if the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following a time-out period, the pwm will restart, causing the output voltage to begin ramping up to its ap - propriate value. if the short-circuit condition persists, another shutdown cycle will initiate. this on/off cycling is called hiccup mode. the hiccup cycling figure 3. measuring output ripple and noise (pard) c1 c1 = 1f ceramic c2 = 10f tantalum load 2-3 inches (51-76mm) from module c2 r load copper strip copper strip scope www.murata-ps.com/support uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 14 of 16 reduces the average output current, thereby preventing excessive internal temperatures. a short circuit can be tolerated indefnitely. trimming the output voltage the trim input to the converter allows the user to adjust the output voltage over the rated trim range (please refer to the specifcations). in the trim equa - tions and circuit diagrams that follow, trim adjustments use either a trimpot or a single fxed resistor connected between the trim input and either the positive or negative output terminals. (on some converters, an external user-supplied precision dc voltage may also be used for trimming). trimming resistors should have a low temperature coeffcient (100 ppm/deg.c or less) and be mounted close to the converter. keep leads short. if the trim function is not used, leave the trim unconnected. with no trim, the converter will exhibit its specifed output voltage accuracy. there are two cautions to be aware for the trim input: caution : to avoid unplanned power down cycles, do not exceed either the maximum output voltage or the maximum output power when setting the trim. be particularly careful with a trimpot. if the output voltage is excessive, the ovp circuit may inadvertantly shut down the converter. if the maximum power is exceeded, the converter may enter current limiting. if the power is exceeded for an extended period, the converter may overheat and encounter overtem - perature shut down. figure 4. trim adjustments using a trimpot lo a d 7 5 - 2 2 t ur ns +out put tri m ? out put ? i n put on/of f c o n t r o l +inp ut figure 6. trim adjustments to increase output voltage using a fixed resistor +out put tri m on/ off cont rol +i nput lo a d r trim up ? out put ? i n put figure 5. trim adjustments to decrease output voltage using a fixed resistor lo a d r trim down +out put tri m on/o ff cont rol +in put ? out put ? i n put v o ? 5 ? 2050 12775 ? 2050 5 ? v o 5110 (vo - 2.5) v o ? 12 ? 5110 25000 ? 5110 12 ? v o 10000 (vo-2.5) uei15-050-q12, q48 uei15-120-q12, q48 v o ? 3.3 ? 2050 12775 r t down (?) = r t up (?) = r t up (?) = r t up (?) = r t up (?) = r t down (?) = r t down (?) = r t down (?) = ? 2050 3.3 ? v o 5110 (vo - 2.5) uei15-033-q12, q48 v o ? 15 ? 5110 25000 ? 5110 15 ? v o 10000 (vo-2.5) uei15-150-q12, q48 trim up www.murata-ps.com/support uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 15 of 16 disabled when the on/off is grounded or brought to within a low voltage (see specifcations) with respect to Cv in . negative-polarity devices are on (enabled) when the on/off is grounded or brought to within a low voltage (see specifcations) with respect to Cv in . the device is off (disabled) when the on/off is left open or is pulled high to +15v d c max. with respect to Cv in . dynamic control of the on/off function should be able to sink appropriate signal current when brought low and withstand appropriate voltage when brought high. be aware too that there is a fnite time in milliseconds (see specifcations) between the time of on/off control activation and stable, regulated output. this time will vary slightly with output load type and current and input conditions. there are three cautions for the on/off control: caution : to retain full output circuit isolation, control the on/off from the in - put side only. if you must control it from circuits in the output, use some form of optoisolation to the on/off control. this latter condition is unlikely because the device controlling the on/off would have to remain powered on and not be powered from the converter. caution : while it is possible to control the on/off with external logic if you carefully observe the voltage levels, the preferred circuit is either an open drain/open collector transistor, a switch or a relay (which can thereupon be controlled by logic). caution : do not apply voltages to the on/off pin when there is no input power voltage. otherwise the converter may be permanently damaged. figure 7. driving the on/off control pin (suggested circuit) on /off contr o l contro l + vc c - i n put through-hole soldering guidelines murata power solutions recommends the th soldering specifcations below when install - ing these converters. these specifcations vary depending on the solder type. exceeding these specifcations may cause damage to the product. your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. wave solder operations for through-hole mounted products (thmt) for sn/ag/cu based solders: maximum preheat temperature 115 c. maximum pot temperature 270 c. maximum solder dwell time 7 seconds for sn/pb based solders: maximum preheat temperature 105 c. maximum pot temperature 250 c. maximum solder dwell time 6 seconds smt refow soldering guidelines the surface-mount refow solder profle shown below is suitable for sac305 type lead- free solders. this graph should be used only as a guideline . many other factors infuence the success of smt refow soldering. since your production environment may differ, please thoroughly review these guidelines with your process engineers. on/off enable control ground bounce protection to improve reliability, if you use a small signal transistor or other external circuit to select the remote on/off control, make sure to return the lo side directly to the Cvin power input on the dc/dc converter. to avoid ground bounce errors, do not connect the on/off return to a distant ground plane or current-carrying bus. if necessary, run a separate small return wire directly to the Cvin terminal. there is very little current (typically 1-5 ma) on the on/off control however, large current changes on a return ground plane or ground bus can accidentally trigger the converter on or off. if possible, mount the on/off transistor or other control circuit adjacent to the converter. figure 8. on/off enable control ground bounce protection preferred location of on/off control adjacent to -vin terminal dc/dc converter install separate return wire for on/off control with remote transistor on/off control transistor do not connect control transistor through remote power bus ground plane or power return bus + vin on/off enable -vin return murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. specifcations are subject to change without notice. ? 2011 murata power solutions, inc. www.murata-ps.com/support murata power solutions, inc. 11 cabot boulevard, mansfeld, ma 0204 8 -1151 u.s.a. iso 9001 and 14001 registered uei15 series isolated wide input range 15-watt dc/dc converters mdc_uei15w.c02 page 16 of 16 ir video camera ir transparent optical window variable speed fan heating element ambient temperature sensor airflow collimator precision low-rate anemometer 3 below uut unit under test (uut) vertical wind tunnel murata power solutions employs a custom-designed enclosed vertical wind tunnel, infrared video camera system and test instrumentation for accurate airfow and heat dissipation analysis of power products. the system includes a precision low fow-rate anemometer, variable speed fan, power supply input and load controls, temperature gauges and adjustable heating element. the ir camera can watch thermal characteristics of the unit under test (uut) with both dynamic loads and static steady- state conditions. a special optical port is used which is transpar - ent to infrared wavelengths. the computer fles from the ir camera can be studied for later analysis. both through-hole and surface mount converters are soldered down to a host carrier board for realistic heat absorption and spreading. both longitudinal and transverse airfow studies are possible by rotation of this carrier board since there are often signifcant differences in the heat dissipation in the two airfow directions. the combination of both adjustable airfow, adjustable ambient heat and adjustable input/output currents and voltages mean that a very wide range of measurement conditions can be studied. the airfow collimator mixes the heat from the heating ele - ment to make uniform temperature distribution. the collimator also reduces the amount of turbulence adjacent to the uut by restoring laminar airfow. such turbulence can change the effec - tive heat transfer characteristics and give false readings. excess turbulence removes more heat from some surfaces and less heat from others, possibly causing uneven overheating. both sides of the uut are studied since there are different thermal gradients on each side. the adjustable heating element and fan, built-in temperature gauges and no-contact ir camera mean that power supplies are tested in real-world conditions. figure 9. vertical wind tunnel |
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