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title engineering prototype report for ep-1 8 10 w, multiple output, isolated power supply with to pswitch ? -gx input voltage 85-265 vac 3.3 v, 1.5 a 5 v, 0.9 a output voltages and current 30 v, 0.03 a output pow e r 10 w e f f i c i e n c y 7 0 % m i n i m u m key specifications p.i. device top243p (topswitc h -gx) target applications high speed digital modems / telecom document number EPR-18 date 05-dec-2002 revisio n 1.3 features ? low cost (lo w component count wit h single side d printed cir c uit board) ? low conducted emi: me ets cispr2 2 b/en5502 2b without requiring a y capacitor ? meets en/ul 1000-4-5 class 4 (4 kv), using line overvolta ge protection feature ? designed to iec60950 safety standard requirements ? ultra-low earth leakage current (<1 a @ 265 vac, 50/60 hz) eliminate s line freque ncy audio hum in voice applicatio ns (?ground loops?) ? compact de sign (l = 11 3 mm, w = 39 mm, h = 25 mm) ? high efficien cy ( 70% at 85 vac) ? line undervoltage shutd o wn prevent s turn-off ou tput glitche s ? line overvol t age shutdo wn provides extended line swell pro t ection ? hysteretic thermal shutdown provide s automatic supply reco very after fa ult removal po w e r integrati ons, i n c. 5245 hell y e r avenue, san jose, c a 95138 usa tel: +1 408 414 9200 fa x: +1 40 8 414 9201 applications hotline: (408 ) 414 -96 60 http://www. powe r int.com
10 w, multi p le output, isolated power supply 05-dec-2002 table of contents 1 introducti on ................................................................................................................. 3 2 power supply s pecificat ion ........................................................................................ 4 3 schemat ic ................................................................................................................... 5 4 circuit desc ription ...................................................................................................... 6 5 pcb lay out ................................................................................................................ 9 6 bill of ma te rials ........................................................................................................ 10 7 transforme r spec ificatio n ......................................................................................... 11 7.1 electrical spec ifications ..................................................................................... 11 7.2 material s ............................................................................................................ 11 7.3 transforme r build diagram ............................................................................... 12 7.4 transforme r cons tructi on .................................................................................. 12 7.5 design no tes ..................................................................................................... 13 7.6 transforme r s ources ......................................................................................... 13 8 transforme r sp readsheet s ....................................................................................... 15 9 performanc e data .................................................................................................... 17 9.1 efficienc y ........................................................................................................... 17 9.2 regulati on ......................................................................................................... 18 9.2.1 load ........................................................................................................... 18 9.2.2 line ............................................................................................................ 18 9.2.3 cross-regulati on table .............................................................................. 19 10 thermal perf ormance ........................................................................................... 20 11 waveform scope plots ......................................................................................... 21 12 load transient response ( 75% to 100% load step) ........................................... 22 13 conducted emi ..................................................................................................... 23 14 surge vo ltage ....................................................................................................... 25 14.1 differential = line-to-line (l-n), 2 ? 14.2 common mode = line-to-gr ound (l-gnd, n-gnd), 12 ? 15 revision hi story .................................................................................................... 26 important note: although the ep-18 is designed to satisfy safe ty isolation requirem ents, the engineering prototype has not been agency approved. ther efore, all testing should be per formed using an is olation transforme r to provide the ac input to the prototype board. page 2 of 28 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
05-dec-2002 10 w, multi p le ou tput, isolated power supply 1 introduct i on this document is an engineerin g report describing a low cos t, is olated converter (ep-18) for a high speed digital modem application. included are the power supply specification, sc hematic, bill of materials, transformer documentation, printed circui t layout, and performance data. figure 1 ? ep-18 popul ated circuit bo ard (lxwxh: 113 mm x 39 mm x 25mm). page 3 of 28 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
10 w, multi p le output, isolated power supply 05-dec-2002 2 power supply s p ecificatio n des c ription sy mbol min ty p max units c o mment input voltage v in 8 5 2 6 5 v a c 50/60 hz outpu t output voltag e 1 v out1 3 . 1 3 3 . 3 0 3 . 4 7 v ? ?
05-dec-2002 10 w, multi p le ou tput, isolated power supply 3 schematic figure 2 - ep-18 schemati c . page 5 of 28 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
10 w, multi p le output, isolated power supply 05-dec-2002 4 circuit descriptio n the ep-18 is a low-c o st fly back switching power supply designed for high speed digital modem applications using the t o p243p integrated circuit. it offers a low cost solution with emphasis on low emi and ultra-low earth leakage c u rrent (no y cap). the c i rcuit schematic details a 10 w, 3 ou tput (3.3 vdc, 5 v dc and 30 vdc) power supply that operates from an 85 vac to 2 65 vac input. the high efficiency (>70%) allows the power supply to operate within specif ication s at elevated am bient temperature. the ac input is rectified and filter ed by d1 t o d4 and c1 to creat e a high voltage dc bus that is connected to transforme r t1. the other side of t1 is driven by the high-voltage mosfet of top243p 1 (u1). fuse f1 protects against primary-side component s failures, while u1 protects agains t secondary components failures, and overloaded/shorted outputs. the combined value of the line sensing re sistors r2 and r3, connected to the mult i- function (m) pin of u1, s e ts the under voltage and overvolt age thresholds and provides a line feed forward function. on increas ing line voltage, t he power supply is inhibit ed until the underv o ltage (uv) threshold is reached (~100 vdc) . on reduc ing line voltage, the uv f unction turns off the power supply when the line input voltage is below the uv thres hold and the output goes out of regulation. this allows the power su pply to continue operat ing at input voltages signific antly below the uv thre s hold until output regulation is los t, but eliminates output glitches by preventing rest art until the input voltage goes back above the uv threshold. the overv o ltage function turns off the powe r supply if the i nput voltage exceeds approximately 450 v. in th e off-state, the power s uppl y can withstand severe lin e transients or extended line s w ell c ondit ions without damage. the s u pply resum e s operation when the input vo ltage falls below the overvoltage threshold. the line feed forward function independently modulates the duty cycle of u1 to reject th e ac line frequency ripple component of th e input voltage, reducing the line frequency ripple at the output of the s upply . the out put ripple specif ications can b e met without increased control loop gain s i nce line feed forward operates i ndependent of the main control loop. this simplifies the design of the power supply control loop. a low cost rcd (r1, c2, r9 and d5) snubber circuit limits the turn-off voltage spik e (caused by the leakage inductance) to a saf e level on t he drain pin of u1. resistor r9 is required in s e ries with the s l ow recove ry diode (d5) to reduce the diode revers e 1 the ?p? an d ?g? p a cka g e s allow eithe r line se nsi ng or external cu rrent limit programming throu gh the m pin. ?y? and ?r? pa ckag es allow b o th function s via t he l and x pin s . redu cin g the cu rrent limit in this desi gn would allow a small e r tran sfo r me r to be used, if desire d . page 6 of 28 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
05-dec-2002 10 w, multi p le ou tput, isolated power supply recovery spike and damp the subsequent oscillat ions which might allo w the drain to ring below source at low line. the bias winding is rectified and filtered by d6 and c11 to power u1. capacitor c3 is used to decouple the control pin, deter mine the auto-restart frequency and together with r4, forms part of the control loop compensation. the secondary winding is rectif ied and filtered by d7, r5, c4 (3 0 v) d8, c5 (5 v) and d9, c7, c8 (3.3 v), with additional s witching frequency ripple and high frequency spike noise filtering provided by l2, c8 (5 v) and l3, c9 (3.3 v) to give the dc outputs. the choic e of schottky diodes for the 3.3 v and 5 v outputs was dr iven by both voltage regulation and efficiency considerations. resist or r5 limits the diode current at start-up and avoids peak charging of the 30 v output. if a fusible resist or is used, r5 can provide short circuit protection for this output. the snubber (c13 and r8) reduces the 10 mhz to 30 mhz conduct ed emi d u e secondary leakage inductance. the current th rough the pre-load resistor r13 adds to the spec minimum load to keep the 30 v output in regu lation. the 3.3 v and 5 v output voltages ar e determined by the v o ltage set at the adjust pin of u3 (shunt regulator) by the voltage divider formed by r 10, r11 and r12. the cu rrent through r12 (250 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
10 w, multi p le output, isolated power supply 05-dec-2002 disrupted for one second (leds blinked indica ting the operation of the overvoltage shutdown feature) when apply i ng the 2 kv, 2 ? ? ?
05-dec-2002 10 w, multi p le ou tput, isolated power supply 5 pcb la yout figure 3 ? ep18 printed circuit layout . actual size board (l = 11 3 mm, w = 3 9 mm, h = 25 mm). for the drain-to-source voltage waveforms, connect the high voltag e probe tip to tp2 and the probe ground to test point tp1. for switching current waveforms, add a wire loop in the provided holes and cu t open the copper trace. use a tektronix a6302 curr ent probe and am503 curr ent probe amplifier (with tm501 power module) or equivalent. page 9 of 28 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
10 w, multi p le output, isolated power supply 05-dec-2002 6 bill of materials bill of mat e rials i t e m q t y . ref. des c ription part number manufac ture r 1 1 c 1 33 ? ? ? ? ? ? ? ? ? ? topswitch-gx t o p 2 4 3 p p o w e r i n t e g r a t i o n s 3 6 1 u 2 optocoupl e r l t v 8 1 7 a l i t e o n 37 1 u3 shunt reg u la tor, 2.5 v 1% lm431b cz nation al sem i con d u c t page 10 of 2 8 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
05-dec-2002 10 w, multi p le ou tput, isolated power supply 7 t r ansformer s p ecification figure 4 - ep18 tra n sfo r m e r elect r ical diag ram. 7.1 electrical specifications electrical str e ngth 1 minute, 60 hz, from pin s 1-5 to pins 6- 1 0 3 0 0 0 v a c primar y indu ctan ce pins 1-2 , all windi ng s ope n, 130 khz measurement frequen cy 1180 7.2 m a t e rials i t e m d e s c r i p t i o n [1] core: ei25, nippon cerami c fei-25, nc-2h mate rial o r equivale nt, gapp ed for a l of 351 nh/t 2 . note: co re lo nger tha n sta ndard ei25. [2] bobbin: yw-360-02b by yih-hwa ente rpri se, 10 pin, with second ary-side p ede stal. pin 3 remove d. [3] magnet wire: #29 awg heavy nyleze [4] triple in sulat ed wire (ti w ): #26 awg [5] tape: 3m 12 98 polyeste r film (white ) 1 0 .58 mm wid e by 2.2 mm thick [6] varnis h page 11 of 2 8 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
10 w, multi p le output, isolated power supply 05-dec-2002 7.3 transformer build diagram figure 5 ? ep18 tran sfo r mer build di a g ram. 7.4 transformer construction shield start at pin 1. wind 15 tu rn s of item [3], bif ilar pa rallel , from left to right, over entire length of the bobbi n. finish on pin 3. tape insula tion 1 layer of tape [5] for ins u lation double primar y la y e r start at pin 2. wind 30 tu rn s of item [3] fr om left to right over entire l ength of the bobbi n. apply 2 layers of ta pe, item [5], for spa c ing . wind remai n i ng 28 turn s in the next layer fro m right to left, over entire le ngth of the bo bbin. finish o n pin 1. tape insula tion 1 layer of tape [5] for ins u lation. bias windin g start at pin 5. wind 7 turns parallel tr ifilar of item [3] fr om left to right, uniformly ov er entire w i d t h of bobbin . fi nish o n pin 4. tape insula tion 6 layers of tape [5] for spa c ing . 3.3 v winding start at pin 6. wind 2 turns parallel tr ifilar of item [4] fr om left to right, uniformly ov er entire w i d t h of bobbin . fi nish o n pin 7. secure turn s with 1 layer of tape. 5 v winding start at pin 9. wind 1 turn of item [4] fro m left to right ov er entire w i d t h of bo b b in . finish o n pin 6. secure turns with 1 laye r of tape. 30 v windin g start at pin 10. wind 13 of item [4] from le ft to right uniformly, over entire wi dth o f bobbi n. finish on pin 9. tape insula tion 3 layers of tape [5] for insu lation. final assem bly a sse mble cor e wit h t he ?i? side on top . sec u re core. dip varnis h the trans f o rmer [6]. page 12 of 2 8 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
05-dec-2002 10 w, multi p le ou tput, isolated power supply 7.5 design no tes powe r integrations device top243p freq uen cy of operation 132 khz m o d e c o n t i n uou s/discontinu o u s peak prim ary current 0.42 a refle c ted vol t age 110 v maximum dc input 375 v minimum dc input 90 v 7.6 transformer sources for information on the vendors used to source the transformers used on this board, please vis i t the power integrations' web site at the url below and select ?engineering prototype boards? http://www.powerint.co m /co m po n entsuppliers.htm page 13 of 2 8 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
10 w, multi p le output, isolated power supply 05-dec-2002 figure 6 - ei25 bobbin drawin g. page 14 of 2 8 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
05-dec-2002 10 w, multi p le ou tput, isolated power supply 8 t r ansformer s p readsheet s pow e r suppl y input vacmin volts 85 minimum ac i nput volta ge vacmax volts 265 maximum ac input volta ge f l hertz 50 ac main f r eq u enc y t c msecon ds 2.33 bridg e rectifie r cond uction t i me estimate z 0.65 loss all o catio n f a ctor n % 75.0 e fficiency e s t i m a t e po w e r su pply outputs out1 out2 out3 v o x v o l t s 3.30 5.00 30. 00 output voltag e i o x a m p s 1.500 0.900 0.030 po w e r su ppl y output current v b v o l t s 12.00 b i a s volta g e i b a m p s 0.000 b i a s curr e n t device var i ables d e v i c e t o p 2 4 3 p d e v i c e n a m e po watts 10.35 t o tal output p o w e r vdrain volts 626 maximum dra i n voltag e esti mate (includ e s effect of leak ag e induc tance) vds volts 3.6 d evice on-stat e drai n to sour ce voltag e f s hertz 132 00 0 d evice s w i t chi ng f r equ enc y krpkdp 0.70 ripp l e to pe ak current r a tio ki 1.00 exter nal c u rre nt limit ratio ilimit ext a m p s 0.70 device c u rrent limit, ex ternal mimimum ilimit min amps 0.70 device current limit, minimum ilimit max amps 0.80 device current limit, max i m u m i p a m p s 0.42 peak primar y c u r r e n t i r m s a m p s 0.22 primar y r m s c u r r e n t dmax 0.56 maximum dut y cy cle pow e r suppl y com ponents selection cin
10 w, multi p le output, isolated power supply 05-dec-2002 pow e r suppl y output parameters v d x v o l t s 0.5 0 .5 0.7 o utput w i ndi n g dio de f o r w a r d voltag e dro p p i v s x v o l t s 16 24 135 output rectif ie r maxim u m pe ak inverse volt age i s p x a m p s 5.55 3.33 0.11 peak seco nd a r y curr ent i s r m s x a m p s 2.50 1.50 0. 05 secon dar y rm s current i r i p p l e x a m p s 2.01 1.20 0.04 out put cap a cit o r rms rip ple current transformer construction parameters core/bo bbi n ei25 core a nd bo bb in t y p e core ma nuf. generic core ma nufact u rin g bobb in ma nuf. generic bobb in ma nufa c turing lp
05-dec-2002 10 w, multi p le ou tput, isolated power supply 9 performance dat a all measur ements performed at room temperature, 60 hz input frequency. test equipment input: voltech (pm100) ac power analyser. power line meter (epd inc.) output: kikusui (plz153w) electro n ic load. 9.1 efficiency e f f i ci en cy v s . l o a d 0 10 20 30 40 50 60 70 80 90 10 0 0. 3 0 . 5 0 . 7 0 . 9 1. 1 1 . 3 1. 5 3. 3 v d c o u t p ut lo a d ( a ) efficiency (% ) 85 v a c , i 5 = 0 . 2 a 2 65 v a c , i 5 = 0 . 2 a e f f i ci en cy v s . l o a d 0 10 20 30 40 50 60 70 80 90 100 0 . 3 0 .4 0 . 5 0 .6 0 . 7 0 .8 0 . 9 5 vd c o u t put load ( a ) efficiency (%) 85 v a c , i 3 . 3 = 0. 3 a 2 6 5 v a c , i3 .3 = 0 . 3 a figure 7 - efficien cy vs. output load. e f f i ci ency vs. li ne v o l t age 0 10 20 30 40 50 60 70 80 90 10 0 85 105 125 14 5 1 6 5 18 5 2 0 5 2 2 5 2 45 2 6 5 li ne vol t a g e ( v a c , 6 0 h z ) ef f i ciency ( % ) figure 8 - efficien cy vs. input voltage a t full load. page 17 of 2 8 po w e r integrati ons, i n c. tel: +1 408 414 9200 fa x: +1 4 08 414 9201 www.po werint.co m
10 w, multi p le output, isolated power supply 05-dec-2002 9.2 regulation 9.2.1 load 3. 3 v d c r e g u l a t i o n ( 5 v d c @ 2 a , 3 0 v d c @ 0. 00 2 a ) 96 97 98 99 10 0 10 1 10 2 0 . 30 . 5 0 . 70 . 9 1 . 11 . 3 1 . 5 3. 3 v d c o u t p u t l o ad ( a ) v ou t /v no m x 100 5 v dc re g u l a t i o n ( 3 . 3 v d c @ 0. 3 a , 30 v d c @ 0. 002 a ) 96 97 98 99 10 0 10 1 10 2 0. 3 0 . 4 0. 5 0 . 6 0. 7 0 . 8 0. 9 5 v d c o u tp u t l o a d (a ) v out /v nom x 100 figure 9 - lo ad re gulatio n at 85 vac . 9.2.2 line li ne r e gul a t i on @ ful l loa d 95 96 97 98 99 10 0 10 1 10 2 85 10 5 1 2 5 14 5 1 6 5 18 5 2 0 5 2 2 5 2 45 2 6 5 l i n e v o l t a g e ( v a c , 60 h z ) v out /v nom x 100 3. 3 v d c @ 1. 5 a 5 v d c @ 0. 9 a 30 v d c @ 0. 0 3 a figure 10 - li ne re gulatio n at full load . page 18 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
05-dec-2002 10 w, multi p le ou tput, isolated power supply 9.2.3 cross-regulation table v out (vdc ) @ min (0 ), m a x (1) loa d , v in = 85 vac, 60 hz 33 5.25 3.465 3 0 5 3 . 3 3 0 5 3 . 3 3 0 5 3 . 3 2 8 . 9 5 . 0 3 3 . 3 3 0 0 0 2 7 4 . 7 5 3 . 1 3 5 3 1 . 5 5 . 2 3 . 1 8 0 0 1 3 0 . 6 4 . 8 8 3 . 4 1 0 1 0 3 3 5 . 0 5 3 . 2 5 0 1 1 2 7 . 5 5 . 0 4 3 . 3 3 1 0 0 2 8 . 7 5 . 2 3 . 1 8 1 0 1 2 8 . 2 4 . 9 3 . 4 1 1 0 2 9 . 7 5 . 0 6 3 . 2 5 1 1 1 m i n ( a ) 0 . 0 1 0 . 3 0 . 3 m a x ( a ) 0 . 0 3 0 . 9 1 . 5 page 19 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
10 w, multi p le output, isolated power supply 05-dec-2002 10 thermal performance d8 (52
05-dec-2002 10 w, multi p le ou tput, isolated power supply 11 w aveform scope plot s figure 12 - drain current a nd drain - to-source voltage at fu ll load (v in = 85 vac, 60 hz). figure 14 - o u tput voltage ripple at full load (v in = 85 vac in, 60 hz). 0.2 a/div 0.2 a/div 100 v/div 100 v/div figure 13 - drain current a nd drain - to-source voltage at fu ll load (v in = 265 vac, 60 hz). 30 v 30 v 3.3 v 5 v 3.3 v 0.4 a / div figure 15 - p r imary curren t and output voltages duri ng start-up at minimu m load (v in = 265 vac in, 60 hz). page 21 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
10 w, multi p le output, isolated power supply 05-dec-2002 12 load t r ansient response (75 % to 100 % load s tep) transient response is measured by changing t he load, at twice the input line frequency, from 75% and 100%. the peak of the output voltage response is c ontrolled by the output capacitor esr while the recovery time is c ontrolled by the output filter and the loop response. figure 16 - 3 . 3 v and 5 vdc re spo n se to 3.3 v load step 75 % - 100% (1.125 a to 1.5 a) at 85 vac (5 v @ 0.9 a). 5 v 5 v 3.3 3.3 0.5 a / div 0.5 a / div figure 17 - 3 . 3 v and 5 vdc re spo n se to 5 v load step 75 % - 100% (0.9 a to 0.675 a) at 85 vac (3.3 v @ 1.5 a). the stability of the power supply under variou s line and load conditions can be confirmed by observing the phase margin at crossover (0 db) and the attenuation (-db) at positive feedback (
05-dec-2002 10 w, multi p le ou tput, isolated power supply 13 conducted emi the attached plots show worst-case emi performance for ep-18 as compared t o cispr22b conducted emissions limits. the sc ans were extended t o 70 mhz or 100 mhz to detect possible peaks that could radi ate from the input/output conductors. figure 19 - condu cted em i result s - fu ll load, 115 v a c, output rtn floatin g. figure 20 - condu cted em i result s - fu ll load, 115 v a c, output rtn groun ded to pe. page 23 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
10 w, multi p le output, isolated power supply 05-dec-2002 figure 21 - condu cted em i result s - fu ll load, 230 v a c, output rtn floatin g. figure 22 - condu cted em i result s - fu ll load, 230 v a c, output g r oun ded to p e . page 24 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
05-dec-2002 10 w, multi p le ou tput, isolated power supply 14 surge v o lt age 14.1 differentia l = line-to-line (l-n), 2 ? sourc e impedance. the unit exceeded the 1 kv iec/ul 1000-4- 5 class 3 requirement (meets class 4, 2 kv). 14.2 common m o de = line-to-ground (l-gn d , n-gnd), 12 ? source impedance the unit exceeded the iec/ul 1000-4-5 class 3, 2 kv, meeting class 4, 4 kv requirements. all three outputs had monitor leds that showed no output disruption during the 90 high voltage surge pulses of class 3 (fast). during class 4 testing, the out puts were disrupted for one second (leds blinked) when apply i ng the 2 kv, 2 ? differenti a l pulse and the 4 kv, 12 ? differential puls e s (l1/gn d, l2/gnd), indicating the overvoltage shutdown protection was triggered. the outputs were unaffected duri ng the 4 kv, 12 ? po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
10 w, multi p le output, isolated power supply 05-dec-2002 15 revision history date author revision description & chang es s l 0 . 1 f i r s t d r a f t 2 0 - j u n - 2 0 0 1 s l 0 . 2 single layer, through hole design 1 6 - j u l - 2 0 0 1 s l 0 . 3 implement ed design r e view com m ents 3 1 - j u l - 2 0 0 1 s l 0 . 4 eliminated y cap, added 2 shield windings and output diode snubb e r. 0 7 - a u g - 2 0 0 1 s l 0 . 5 updated transformer design, test data and pictures. 2 1 - n o v - 2 0 0 2 p v 1 . 2 updated emi and thermal image. minor text changes 05-dec-2002 im 1.3 updates after review page 26 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
05-dec-2002 10 w, multi p le ou tput, isolated power supply notes page 27 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m
10 w, multi p le output, isolated power supply 05-dec-2002 for the la te s t upda te s , v i s i t our we b s i te : www. powerint . com t he products a nd ap plic atio ns illustrate d her ein (i nclu din g c i rcuits e x tern al to the prod ucts and transform er constructio n ) ma y b e cover e d b y one or mo re u.s. and fo reig n pate n ts or potentia ll y b y pen din g u.s. and forei gn patent a ppl icati ons assi gn ed to po w e r inte grations. a comp lete list of pow e r integrat i o n s ? patents ma y be foun d at w w w . pow erint.com . po w e r integr ati ons reserv es the rig h t to make chan ges to it s products at a n y time to im pr ove rel i ab ilit y o r manufactur abi li t y . po w e r inte gratio ns do es not assume a n y li abi lit y arisi n g from the use of an y devic e o r circuit descri bed h e re in, nor do es it conve y a n y lice n se un der its p a tent rights or the rig h ts of others. t he pi logo, topswitch , t i nyswitch and ecosmart are reg i stered t r adem arks of po w e r integr atio ns, inc. ? c op yrig ht 20 02, po w e r inte gratio ns, inc. worl d he a d q u a r te rs nor t h a m e r i c a - west power integ r atio ns, inc. 5245 hel l y e r avenue san jose, ca 95 138 usa. mai n : +1-408-4 14-92 0 0 customer servi c e: phone: +1-408-4 14-96 6 5 fax: +1-408-4 14-97 6 5 e-m a il: usasales@powerint.com europe & a f r i c a power integ r ati o ns (europe ) ltd. centenni al cou r t easthampstead road bracknel l berkshi r e rg 12 1 y q , uni t ed ki ngdom phone: +44-1344 -462- 3 00 fax: +44-1344 -311- 7 32 e-m a il: eurosales@pow erint.com sing a p ore power integ r ati o ns, si ngapore 51 g o ldhill plaza #16-05 republ i c of si ngapore, 308900 phone: +65-6358 -2160 fax: +65-6358 -2015 e-m a il: singaporesales@powerint.co m ta iwa n power integ r atio ns internati onal hol d i ngs, inc. 17f-3, no. 510 chung hsi ao e. rd., sec. 5, tai pei , tai w an 1 10, r.o . c. phone: +886-2-2 727-1 2 21 fax: +886-2-2 727-1 2 23 e-m a il: taiwansales@powerint.co m chin a power integ r atio ns internati onal hol d i ngs, inc. rm# 1705, bao hua bl dg. 1016 hua q i ang bei lu shenzhen g u an gdong, 518031 phone: +86-755- 8367- 5143 fax: +86-755- 8377- 9610 e-m a il: chinasales@powerint.com kore a power integ r atio ns internati onal hol d i ngs, inc. rm# 402, h andu k bui l d i ng, 649-4 y eoksam- dong, kangnam- g u, seoul , korea phone: +82-2-56 8-752 0 fax: +82-2-56 8-747 4 e- m a il: koreasales@powerint.co m ja p a n power integ r atio ns, k.k. kei h i n -tatemono 1st bl dg. 12-20 shi n - y oko hama 2-chome, kohoku-ku, y o kohama-shi , kanaga w a 22 2-0 033, japan phone: +81-45-4 71-10 2 1 fax: +81-45-4 71-37 1 7 e-m a il: japansales@powerint.com indi a ( t ec hnica l supp ort) innovatech #1, 8th mai n roa d vasanthnagar bangal ore, indi a 560052 phone: +91-80-2 26-60 2 3 fax: +91-80-2 28-97 2 7 e-m a il: indiasales@powerint.com page 28 of 2 8 po w e r integrati ons, i n c. tel : +1 408 414 9200 fa x: +1 4 08 414 9201 www.po weri nt.c o m

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