View LD7580A_7684495.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LD7580A 9/5 /2012 1 leadtrend technology corporation www.lea dtrend.com.tw ld7 850a - ds - 00 september 2012 pwm current mode controller with quasi - resonant operation rev general description the LD7580A is a current mode pwm controller and features quasi resonant operation . it operat es in dcm at light load to optimize the efficiency and opera tes in bounda ry condition at high power level. the LD7580A is integrate d with high voltage startup circuit , green - mode power - saving operation , and leading - edge blanking of the current sensing . it also incorporate s with several protections like olp (over load protection ) , ovp (over voltage protection) , otp (over temperature protection) etc. highly integration and tiny package make it an ideal choice in wide variety of applications , and in addition to minimiz e the component counts and the circuit space . in capable of per forming boundary operation , it can reduce the switching loss and the reverse s recovery loss of rectify diode when the m osfet turn s on. it is designed to m eet the latest power saving regulations for wide input voltage range of applicati on s . feature s ? high - v oltage (500v) startup circuit ? current mode control ? minimum drain voltage switching ? green mode control at light load ? uvlo (under voltage lockout) ? leb (leading - edge blanking) on cs pin ? over voltage comparator on v cc and qrd pin ? olp (over load protection) ? in ternal over temperature shutdown ? +5 00 / - 700 ma d riving capability applications ? switching ac/dc adaptor ? open frame switching power supply ? lcd monitor/tv power supply
LD7580A 2 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 typical application pin configuration order ing information part number qrd - ovp protection protection mode olp/ vcc ovp package top mark shipping LD7580A gs yes auto - recovery sop - 8 LD7580A gs 2500 /tape & reel LD7580Ag n yes auto - recovery dip - 8 LD7580A gn 3600 /tube /carton the ld 7580a is rohs compliant/ green packaged. e m i f i l t e r c o m p v c c c s q r d h v o u t g n d l d 7 5 8 0 a * a c i n p u t yy: year code ww: week code pp: production code sop - 8 & dip - 8 (top view) 1 8 2 3 4 7 6 5 top mark yywwpp yywwpp qr d comp cs gnd hv nc vcc out
LD7580A 3 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 pin descriptions pin name function 1 qrd quasi resonant detection . a voltage signal will be issued from t he auxiliary winding after the transformers core is completely demagnetized . t he auxiliary winding voltage will de crease until it reaches the internal setting value, and then enter qr mode operation . in addition , an over voltage comparator ( with 3.5 v r eference voltage) is built - in with qrd pin. once ovp is detected, the LD7580A will turn off immediately . 2 co mp voltage feedback pin (same as the comp pin in uc384x) . c onnect a photo - coupler to close the co ntrol loop and achieve the regulation. v oltage of comp pin varies in proportion to output power. this pin also provide over load protection function , if the vo ltage of comp pin higher than a threshold of around 5.0v and more than 60ms, the control ler will stop out signal and enter protection mode . 3 cs current sense pin . primary side current is sensed and determined for its max level through a resist e r . t he sen sed signal will be compared with dc voltage (0.8 5 v typ.) across leb circuit. primary current is limited by ocp comparator cycle by cycle. 4 gnd ground . c onnect a capacitor between vcc and gnd . 5 out gate drive output , t o drive the external mosfet . 6 vcc supply voltage pin . connect a 0.1 ? f bypass capacitor between vcc and gnd pin s as close as possible to filter high frequency noise. with the high voltage start - up circuit, a start - up resister is eliminab le . 7 nc unconnected p in to ensure adequate creep ag e distance 8 hv connect this pin to positive terminal of bulk capacitor to provide 1ma to vcc bulk capacitor through constant current source . when vcc voltage trips the uvlo ( on), this hv loop will be turn ed off to reduce the power loss of startup circuit . a current limit resistor is strongly recommend ed to be place d between high voltage side and hv pin to avoid negative turn - on spike.
LD7580A 4 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 block diagram p w m c o m p a r a t o r 2 * v f h v 1 6 / 1 0 u v l o c o m p a r a t o r 1 m a v c c o k v r e f o k p g 0 . 8 5 q q s e t c l r s r q q s e t c l r s r p g o v p c o m p a r a t o r 2 7 . 5 v o v p 8 v p o r f b c s 5 v o l p c o m p a r a t o r q q s e t c l r s r p g f a u l t f a u l t 5 5 m v g n d o u t + - + - + - / 2 + - + - o s c g r e e n & b u r s t m o d e c o n t r o l + - i n t e r n a l b i a s & v r e f l e b 3 2 8 5 4 t i m e d e l a y + - 3 2 v v c c 6 b l a n k i n g d m a x p r o t e c t i o n / 3 b i a s q r d v f b > 2 . 3 5 v q r d q r d p o r t i m e o u t + - o v p d e l a y & s a m p l i n g 3 . 5 v o c p c o m p . r r d r i v e 1
LD7580A 5 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 absolute maximum ratings supply voltage vcc - 0 .3v~30v high - voltage pin, hv - 0.3 v~500v fb , cs , qr d - 0.3 v~7v out - 0.3 v~vcc+0.3v maximum junction temperature 150 ? c operating ambient temperature range - 4 0 ? c to 85 ? c operating junction temperature range - 4 0 ? c to 12 5 ? c storage temperature range - 6 5 ? c to 1 50 ? c package thermal res istance (sop - 8) 160 ? c /w package thermal resistance (dip - 8) 100 ? c /w power dissipation (sop - 8, at ambient temperature = 85 ? c ) 250 mw power dissipation (dip - 8, at ambient temperature = 85 ? c ) 400 mw lead temperature (soldering, 10sec) 260 ? c esd voltage p rotection, human body model ( e xcept hv pin) 2.5 kv esd voltage protection, human body model (hv pin) 1.0 kv esd voltage protection, machine model (includ ing hv pin) 25 0v gate output current + 500/ - 700ma caution: stress exceeding maximum ratings may d amage the device. maximum ratings are stress ratings only. functional operation above the recommended operating conditions is not implied. extended exposure to stress above recommended operating conditions may affec t device reliability. recommended opera ting conditions item min. max. unit supply voltage vcc 1 2 2 6 v comp capacitor value 1 100 nf note: 1. it s essential to connect a capacitor to comp pin to filter out the undesired switching noise for stable operation. 2. the small signal components should be placed around the ic pin as close as possible.
LD7580A 6 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 electrical characteristics (t a = +25 o c unless otherwise stated, v cc =15.0v) parameter conditions min typ max units high - voltag e supply (hv pin) high - voltage current source v cc < uvlo(on) ,hv= 5 00v 0.5 1.0 1. 5 ma off - state leakage current v cc > uvlo(off) ,hv= 5 00v 0 - 35 ? supp ly voltage ( v cc pin) startup current - 300 3 9 0 ? comp =0v - 2.5 3.5 ma v comp =3v - 2 .5 3.5 ma olp tripped - 0.5 0. 8 ma ovp tripp ed (vcc pin/ qrd pin) - 0. 6 0. 8 ma internal otp tripped - 0.5 0. 8 ma uvlo (off) 9 10 11 v uvlo (on) 15 16 17 v ovp level 27 28 29 v voltage feedback ( comp pin) short circuit current v comp =0v 1.1 1.5 2. 4 m a open loop voltage comp pin open 5.2 5 .8 6. 6 v burst mode trip level - 1.4 1.6 v green mode threshold vcomp - 1.75 - v qr mode on threshold - 2.35 2.6 v qr mode hysteresis - 0.25 0.35 v qr mode blanking time 6. 2 8 9. 8 ? ? current sens ing (cs pin) maxim um input voltage, vcs(off) 0.80 0.85 0.90 v leading edge blanking time - 200 320 ns input impedance 1 - - m ?
LD7580A 7 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 electrical characteristics (t a = +25 o c unless otherwise stated, v cc =15.0v) parameter conditions min typ max units oscillator for switching frequency green mode frequency - 20 - khz maximum on duty , d max v fb LD7580A 8 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 typical performance characteristics
LD7580A 9 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012
LD7580A 10 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - ds - 00 september 2012 application information operation overview as long as the green power requirement becomes a trend and the power saving is getting more and more important for the switching power supplies and switching adaptors, the traditional pwm controllers wo uld not afford to support such new requirements. furthermore, the cost and size limitation force the pwm controllers should be more powerful to integrate with more functions to reduce the external part counts. the LD7580A is designed for such application to provide an easy and cost effective solution . its detail ed features are described as below. internal high - voltage startup circuit and under voltage lockout (uvlo) fig. 11. traditional circuit s power on the pwm controller through a startup resistor to provide current. however, the startup resistor used here was usually of larger resistance, it therefore required more power and more time to start up. to achieve the optimized topology, as shown in fig. 11 , the LD7580A was built in with high voltage startup circuit to optimize the power saving. the high - voltage current source will sink current from the bulk capacitor to provide startup current to the pwm ic and charge the vcc capacitor c1. d uring startup, the vcc is below the uvlo (off) threshold thus the current source is activated to supply current of 1ma. meanwhile, it demands only 3 00 ? a for vcc supply current , so most of the hv current is reserved to charge the vcc capacitor. by using su ch configuration, the turn - on delay time will be almost same either in low - line or high - line conditions. when the vcc voltage exceed s uvlo(on) level to power on the LD7580A and further to issue the gate drive signal, t he high - voltage current source will be disable d and the auxiliary winding of the transformer will take over to supply the current. therefore, the power loss on the startup circuit can be reduced and it easily achieve p ower saving. in general application, a 39k ? resistor is still recommended t o place in high voltage path to limit the current if there is a negative voltage appli ed in any case. an uvlo comparator is included to detect the voltage on the v cc pin to ensure the supply voltage enough to power on the LD7580A pwm controller and in addi tion to drive the power mosfet. as shown in fig. 12 and fig. 13 , a hysteresis is provided to prevent the shutdown from the voltage dip during startup. the turn - on and turn - off threshold level are set at 16v and 10.0v, respectively . c b u l k c o m p v c c c s q r d h v o u t g n d r 1 l d 7 5 8 0 a v d c c 1
LD7580A 11 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 fig. 12. fig. 13. current sensing, leading - edge blanking and the negative s p ike on cs pin the typical current mode pwm controller f eedbacks both current signal and voltage signal to close the control loop and achieve voltage regulation. the LD7580A detects the primary mosfet current from the cs pin, which is not only for the peak current mode control but also for the pulse - by - pulse cu rrent limit. the maximum voltage threshold of the current sensing pin is set as 0.85v. thus the mosfet peak current can be calculated as: a 200 ns leading - edge blanking (leb) time is in corporated in the input of cs pin to prevent th e false - trigger being caus ed by the current spike. in the low power application, if the total pulse width of the turn - on spikes is less than 20 0ns and the negative spike on the cs pin is not over - 0.3v, the r - c filter (as shown in fig. 14 ) is eliminab le . however, the total pulse width of the turn - on spike is determined by th e output power, circuit design and pcb layout. it is strongly recommended to add a small r - c filter (as shown in fig. 15 ) for higher power application to avoid the cs pin from damage by the negative turn - on spike. fig. 14. i n t e r n a l b i a s & v r e f h v v f r o m c b u l k 1 6 / 1 0 v c c u v l o c o m p a r a t o r 1 m a v c c u v l o ( o n ) u v l o ( o f f ) t t h v c u r r e n t 1 m a s t a r t u p c u r r e n t ( < 1 0 0 u a ) v c c c u r r e n t ~ 0 m a ( o f f ) o p e r a t i n g c u r r e n t ( s u p p l y f r o m a u x i l i a r y w i n d i n g ) s ) max ( peak r v 85 . 0 i ? c s v c c g n d l d 7 5 8 0 a r e m o v e a b l e i f t h e n e g a t i v e s p i k e i s n o t o v e r s p e c . ( - 0 . 3 v ) . o u t 2 0 0 n s b l a n k i n g t i m e
LD7580A 12 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 fig. 15. output stage and maximum duty - cycle an output stage of a cmos buffer, with t ypical 500ma driving capability, is incorporated to drive a power mosfet directly. and the maximum duty - cycle of LD7580A is limited to 75% in order to avoid the transformer flux saturat ion . voltage feedback loop the voltage feedback signal is issued fro m the tl431 in the secondary side through the photo - coupler to the fb pin of ld7580 a . the input stage of LD7580A , like the uc384x, is with 2 diodes voltage offset then feeding into the voltage divider with 1/3 ratio, that is, a pul l - high resistor is embedded internally thus can be eliminated on the external circuit. oscillator and switching frequency as ld7580 a controller is powered on by vcc , t here are four operation modes in estimated load level. at light load ( v comp less than 1 . 75 v) , the switching frequency of power supply fixe s a t 20khz to reduce switching loss and avoid audio noise. the switching frequency of LD7580A is vari ous in green mode operation when comp pin voltage is between 1. 75 v and 2. 35 v. larger comp voltage produc e s high er s witching frequency. t he LD7580A controller operates in quasi - resonant mode when comp pin voltage level exceeds 2. 35 v. in this operation mode , switching frequency is also vari ous as output load change s and mains voltage regulate s . quasi - r eson ant o peration and emi p erformance the LD7580A is implemented with quasi - resonant operation function . i t enable s the power supply designers to minimize the emi component s and system cost. due to valley switching of power mosfet, mosfet switching loss and e mi level is reducible . on/off control if comp pin is pulled below 1.2v, it will turn off t he LD7580A and disable its gate output pin immediately . the off - mode will be released soon after the pull - low signal is removed. dual - oscillator green - mode operation there are lots of topologies implemented in different chips for the green - mode or power saving requirements such as burst - mode control , skipping - cycle mode , variable off - time control etc. the basic operation theory of all these approaches intended to reduce the switching cycles under light - load or no - load condition either by skipping some switching pulses or reduce the switching frequency. what LD7580A use s to implement the power - saving operation is leadtrend technology s own ip. by using this dua l - oscillator control, the burst - mode frequency can be well controlled and further to avoid the generation of audible noise. c s v c c g n d l d 7 5 8 0 a r - c f i l t e r i s n e e d e d w h e n e v e r t h e n e g a t i v e s p i k e i s e x c e e d - 0 . 3 v o r t h e t o t a l s p i k e w i d t h i s o v e r 2 0 0 n s l e b p e r i o d . o u t ) v 2 v ( 3 1 ) v f comp pwm ( comparator ? ? ? ?
LD7580A 13 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 over load protection (olp) to protect the circuit from damage at over load or short condition, a smart olp function is built in wi th the LD7580A for it , as shown in fig. 16 . fig. 17 shows the waveforms of the olp operation. under such fault condition, the feedback system will force the voltage loop enter toward saturation (6v) and then pull comp pin voltage to high level . as soon as v comp trips the olp threshold of 5.0v and continues for over 60 ms, the protection will be activated and then turns off the gate output to stop the sw itching of power circuit. the 6 0ms delay t ime is to prevent the false trigger ing in the transient of power - on and turn - off. a divide - 2 counter is implemented to reduce the input average power under olp behavior. as olp is activated, the output will be latched off and the divide - 2 counter will start to count the number s of uvlo( off ). the latch will be released if the 2nd uvlo(off) point is counted then the output is recover ed to switch again. by using such protection mechanism, the average input power can be reduced to extreme ly low level so that the component temperature and stress can be controlled within the safe operating area. fig. 16. fig. 17. ovp (over voltage protection) on vcc the v gs ratings of the nowadays power mosfets are most ly with 30v maximum. to prevent from v gs fault , LD7580A is implemented with over - voltage protection on vcc. if vcc voltage exceeds ovp threshold, the output gate drive circuit will be shutdown simultaneous ly , thus to stop th e switching of the power mosfet until the next uvlo( on ) arrives . the vcc ovp function in LD7580A is an auto - recovery type protection. if the ovp condition is not released , which is usually caused by the feedback loop open, the vcc will tripped the ovp l evel again and re - shutdown the output . the vcc works in hiccup mode. fig. 18 shows its operation. on the other hand, if the ovp condition is removed, the vcc level will resume to normal level and the output will automa tically return to the normal operation. 5 v o l p c o m p a r a t o r q q s e t c l r s r p g f a u l t / 2 + - t i m e d e l a y p o r c o m p g n d v c c u v l o ( o n ) u v l o ( o f f ) t t c o m p o l p 5 . 0 v t o u t 3 0 m s s w i t c h i n g s w i t c h i n g n o n - s w i t c h i n g o l p t r i p l e v e l 2 n d u v l o ( o f f ) o l p c o u n t e r r e s e t o v p l e v e l
LD7580A 14 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 fig. 18. zero voltage detection and q - r mode opera t ion the transformer will be demagnetized after the main power mosfet turn s off. a quasi resonant signal will be detect ed from auxilia ry winding by qrd pin through the external resister . as soon as the current of the secondary side freewheeling diode falls down t o zero during mosfet - off period, the transformer s core has been demagnetized completely . v ds of mosfet will resonate in discon tinuous current mode. the resonance frequency (f qr ) will be obtained as below. inductance of primary winding resonan ce equivalent parasitic capacitance if v ds voltage falls from max pla teau value to resonant valley level, it will trip qrd comparator as qrd pin voltage is approaching 55mv . the LD7580A will turn on mosfet after first valley voltage is in resonant period. the over voltage protection is built in qrd pin . it will sample the plateau voltage after power mos turns off. the delay time (1.6 ? s typ.) of ovp guarantees a clean plateau, providing a leakage inductance ringing that has been fully damped. pull - low r e sistor on the gate pin of mosfet a n anti - floating resistor is impleme nted i n the out pin to prevent any uncertain output from mosfet working abnormally or false triggering - on. however, such design won t cover all the condition s of disconnection of gate resistor r g . i t is still st rongly recommended to have a resistor connec ted at the mosfet gate terminal (as shown in fig. 19 ) to provide extra protection for fault condition. this external pull - low resistor is to prevent the mosfet from damage during power - o n , if the gate resistor is disco nnected. so, a s show n in fig. 20 , the resistor r8 can provide a discharge path to avoid the mosfet from being false - triggered by the current through the gate - to - drain capacitor c gd . therefore, the gate - source of m osfet should be pulled low and maintain in off - state no matter the ga te resistor is disconnected n or opened in any case. fig. 19. v c c u v l o ( o n ) u v l o ( o f f ) t o v p t r i p p e d t o u t s w i t c h i n g s w i t c h i n g n o n - s w i t c h i n g o v p l e v e l ) hz ( c l 2 1 f r m qr ? ? ? ? m l ? r c c s g n d l d 7 5 8 0 a r e c o m m e n d e d t o i m p l e m e n t e d o n t h e p o w e r c i r c u i t . o u t r g r 8 w i t h a n i n t e r n a l p u l l - l o w r e s i s t o r , t h e l d 7 5 8 0 c a n p r e v e n t a n y f l o a t i n g c o n d i t i o n .
LD7580A 15 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 fig. 20. protection resistor on the hi - v path in some other hi - v pr ocess es and design s , there is probably some parasitic scr caused around hv pin, v cc and gnd. a s shown in fig. 21 , a small negative spike in the hv pin may trigger this parasitic scr and cause latchup between v cc and gnd . it will damage the chip easily since the equivalent short - circuit will be induced by such behavior. with LD7580A , the designer can eliminate the parasitic scr efficiently . fig. 22 shows the equivalent circuit of ld758 0a s hi - v structure. it s capab le to sustain negative voltage and superior than similar products. even though , a 40 k ? resistor is still recommended to be placed on the hi - v path to act as a current limit resistor if there is a negative voltage applying . fig. 21. fig. 22. c s g n d l d 7 5 8 0 a w i t h o u t t h i s r e s i s t o r , t h e m o s f e t w i l l b e f a l s e t r i g g e r e d b y t h e c u r r e n t t h r o u g h c g d i f r g i s d i s c o n n e c t e d . o u t r g r 8 c g d v b u l k dt dv cgd i bulk ? ? v c c g n d o t h e r h v p r o c e s s w i t h p a r a s i t i c s c r h v n e g a t i v e - t r i g g e r e d p a r a s i t i c s c r . s m a l l n e g a t i v e s p i k e o n h v p i n w i l l c a u s e t h e l a t c h u p b e t w e e n v c c a n d g n d . 0 v v c c g n d l d 7 5 8 0 a p a r a s i t i c e f f e c t s b e t w e e n h v , v c c a n d g n d h v c u r r e n t l i m i t r e s i s t o r f o r p r e v e n t i n g d a m a g e f r o m n e g a t i v e v o l t a g e ( r e c o m m e n d e d ) 0 v
LD7580A 16 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 reference applicatio n circuit --- 50 w ( 12 v/ 4 a) adapter pin < 0. 3 w when p out = 0w & v in = 264v ac n 1 : n 2 t 1 c 1 c 2 r 2 d 1 q 1 l f 1 r x 1 r x 1 c x 1 c x 2 l f 2 n t c 1 r 9 r 1 0 c 7 c 8 c 9 l 1 c 1 0 c o m p v c c c s q r d h v o u t g n d r 6 d 3 r 7 r 8 r 1 c y 1 c y 2 c 3 d 2 r 3 r d 1 r 1 1 r 1 3 r 1 2 u 3 d 5 d 4 c 1 1 c y 3 f 1 m o v 1 b d 1 u 2 a l d 7 5 8 0 a u 2 b r 1 4 c 5 c 6 r d 2
LD7580A 17 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 bom p / n component value note p / n component value note f1 t3.15a/250v r10 10/1w 5% ntc 5 ? /3a r11 4.7k 0805 1% mov1 471kd07 r12 510 0 805 5% cx1 x2 0.1 ? f/250v r13 1.2k 0805 1% lf1 t9*6*3 0.5mh r14 nc lf2 uu15.7 30mh c1 100 ? f/400v cx2 x2 0.33uf/250v c2 2200pf/1kv cy1 y 2 1000p/250v c3 22 ? f/50v cy2 y2 1000p/250v c4 nc cy3 y1 1000p/250v c5 0.1 ? f/25v 0805 10 % b d1 2a/600v c6 100pf/50v 0805 10% u1 ld7580 a c7 2200pf/500v 1206 10% u2 ltv817c c8 1000uf/25v u3 tl431ac 2.5v 1% c9 1000 ? f/25v r1 51k 1206 5% c10 100 ? f/25v r2 75k/1w 5% c11 0.1 ? f/25v 0805 10% r3 10 1206 5% d1 pr1007 1a/1kv rx1 1m 1206 5% d2 pr1002 1a/200v rx2 1m 1206 5% d 3 ll4148 sod - 80 r6 100 0805 5% d4 20a/100v to - 220 r7 10k 0805 5% d5 nc r8 510 0805 5% t1 pq2620 pc44 r9 0.82/1w 5% ref. value q1 7a/600v to - 220 rd1 27k 0805 5% l1 r3*15 1.5 ? h rd2 27k 0 805 5%
ld7580 a 18 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 package information sop - 8 symbols dimensions in millimeters dimensions in inch min max min max a 4.801 5.004 0.189 0.197 b 3.810 3.988 0.150 0.157 c 1.346 1.753 0.053 0.069 d 0.330 0.508 0.013 0.020 f 1.194 1.346 0.047 0.053 h 0.1 78 0.254 0.007 0.010 i 0.102 0.254 0.004 0.010 j 5.791 6.198 0.228 0.244 m 0.406 1.270 0.016 0.050 0 8 0 8
ld7580 a 19 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 package information dip - 8 symbol dimension in millimeters dimensions in inches min max min max a 9.017 10.160 0.355 0.400 b 6.096 7.112 0.240 0.280 c ----- 5.334 ------ 0.210 d 0.356 0.584 0.014 0.023 e 1.143 1.778 0.045 0 .070 f 2.337 2.743 0.092 0.108 i 2.921 3.556 0.115 0.14 0 j 7.366 8.255 0.29 0.325 l 0.381 ------ 0.015 -------- i mportant notice leadtrend technology corp. reserves the right to make changes or corrections to its products at any time without notice. customers should verify the datasheets are current and complete before placing order.
ld7580 a 20 leadtrend technology corporation www.leadtrend.com.tw ld7 850a - d s - 00 september 2012 r e vision history rev. d a te change notice 00 9 / 5 /2012 original specification.

▲Up To Search▲

Price & Availability of LD7580A

	To Download LD7580A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .