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power management & supply version 1.2, aug 2010 application note an-EVAL3DS01G28W 28w-lcd ? monitor smps evaluation board with ice3ds01g author: harald z?llinger published by infineon technologies ag http://www.infineon.com/coolset never stop thinking
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 1 from 15 EVAL3DS01G28W v1.2 table of contents table of contents .............................................................................................................. .................................... 1 introduction................................................................................................................... ........................................ 2 list of features............................................................................................................... ....................................... 3 power supply sp ecifica tion..................................................................................................... ............................. 3 schematic ...................................................................................................................... ......................................... 4 functional description ......................................................................................................... ................................ 5 pcb layout a nd assembly........................................................................................................ ........................... 6 bill of ma terial ............................................................................................................... ....................................... 7 transformer co nstruction ....................................................................................................... ............................ 8 performance data ............................................................................................................... .................................. 9 references..................................................................................................................... ....................................... 11
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 2 from 15 EVAL3DS01G28W v1.2 introduction application this document is an demoboard description for a low cost universal input lcd ? monitor power supply designed in a typical off line fly back converter topology that utilizes the ice3ds01g controller. the application operates in discontinuous curr ent mode using the burst mode during standby condition. the board has two output vo ltages with secondary regulation. the high avalanche rugged coolmos ? ?
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 3 from 15 EVAL3DS01G28W v1.2 list of features feature controller ice3ds01g external sense adjustable softstart over load protection with auto restart over current protection with auto restart over temperature with latched shutdown open loop protection with latched shutdown under voltage lock out with auto restart active burst mode internal startup current source drain source voltage 600v internal leading edge blanking 110 khz working frequency standby power according to european comission table 1 ? list of features power supply specification description symbol min typ max units input section input voltage v acin 90 115/230 270 v ac line regulation (85...270v) < 1 % input frequency f ac 47 50/60 64 hz standby input power (240v ac ) 1 < 480 mw output section output voltage 1 v out 5 v dc output voltage ripple (270v ac ) v ripple <200 mv p-p output current i out 2 a dc output power p out 0,15 10 w output voltage 2 v out 12 v dc output voltage ripple (270v ac ) v ripple <200 mv p-p output current i out 1,5 a dc output power p out 0 18 w peak power p outmax 34 w load regulation (10...100%) < 1 % efficiency (90v ac )
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 4 from 15 EVAL3DS01G28W v1.2 schematic figure 2 lcd monitor supply
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 5 from 15 EVAL3DS01G28W v1.2 functional description introduction the EVAL3DS01G28W demoboard is d esigned as a low cost lcd - monitor power sup ply using the ice3ds01g integrated circuit controller. the circuit shown in figure 2 details a 5v, 12v 28w supply that operates from an line input voltage range of 85 to 265v ac , suitable for applications requiring low power standby function. line input the ac line input side comprises of an input fuse f1 as line input over current protection as well as choke l1 and the x2 capacitors c7 and c22 as radio interference suppressors. after the bridge rectifier br1 and input capacitor c3, a voltage from 120 to 380 v dc is present. only a 82f input capacitor is required due to the wide duty cycle dc max of the ice-f3-family. startup the internal current source char ges up the chip supply capacitor c4 with a current of approximately 1ma. operation mode during operation, the v cc pin is supplied via a separate transformer winding with associated rectification d2 and buffering c4. resistor r6 is used for current limiting during the charging of c4. in order not to exceed the maximum voltage at v cc pin resistor r15 causes an voltage drop of about 1v. additional an external zener diode d5 can be used to lim it this voltage if necessary. during light or no load condition the controller switches over to active burst mode operation order to reduce the switching losses without audible noise. softstart in order to minimize the electrical stress, a soft-star t function is realized by an internal resistor and the adjustable external capacitor c10. snubber network due to the high avalanche rugged coolmos inside, a simple rcd snubber protection can be used. the network r7, c8 and d3 clamp the drain vo ltage spike caused by transformer leakage inductance to a safe value below the drain source break down voltage v dsbr = 650v maximum. limitation of primary current the coolmos drain source current is sensed via exter nal shunt resistors r10 and r11. an accurate value of the shunt improves the pea k power limitation shown in the cu rve peak power limitation in the rear of this report and minimize the electrical st ess on mosfet, transformer and output rectifier. output voltage power is coupled out on the secondary side via a fast-acting diodes d1 and d4 with low forward voltage. capacitors c5, c14 and c9, c15 performs energy buffering, following lc - filters l2, c16 and l3, c17 considerably reduces the output voltage rippl e. the used storage output capacitors c5, c14 and c9, c15 are selected to have a very low esr in order to minimize the output voltage ripple caused by the triangular current characteristic. regulation the output voltage is controlled using a type tl431 re ference diode. this device incorporates the voltage reference as well as the error amplifier an d a driver stage. the output voltage is set with resistors r1 and r2. compensation network c1, c2, r1, r5 constitutes the external circuitry of the error amplifier of ic2. this circ uitry allows the feedback to be prec isely matched to dynamically varying load conditions, thereby providing stable control. the maximum current through the optocoupler diode and the voltage reference is set by using resistors r3, r4. optocoupler ic1 is used for floating transmission of the control signal to the ?feedback? input of the ice3ds01g control device. the optocoupler used meets din vde 884 require ments for a wider creepage distance.
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 6 from 15 EVAL3DS01G28W v1.2 pcb layout and assembly figure 3 board layout - component side figure 4 board layout - bottom side
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 7 from 15 EVAL3DS01G28W v1.2 bill of material pos. n o p part type grid ordering code manufacturer 1 1 br1 b380 c1500 2 1 c1 470nf, 25v, x7r 1206 3 1 c2 3,3nf, 25v, x7r 1206 4 1 c3 82uf,400v, d30x20 10mm rubycon axf series 5 1 c4 47uf, 35v 2,5mm 6 3 c9, c15, c17 1000uf, 16v 5mm epcos b41886- rubycon zl series 7 2 c7, c22 0,1uf, 275v, x2 15mm b81130-c1104m epcos 8 1 c8 1nf, 400v, mkt 7,5mm 9 3 c5, c14, c16 470uf, 25v 5mm epcos b41886- rubycon zl series 10 4 c10, c11, c18, c19 1uf, 25v 1206 11 1 c6 1nf, 250v, y1 12,5mm wkp vishay 12 1 d1 byw98-200 15mm 13 1 d2 lln4148 mm 14 1 d3 1n4937 10mm 15 1 d4 sb540 15mm 16 1 d5 zmm20 mm 17 1 f1 microfuse 3,15a, f 5mm 18 1 ic1 sfh617a-3x016 10mm 19 1 ic2 tl431clp to92 20 1 ic3 ice3ds01g so8 infineon 21 1 t1 spb03n60c3 to252 infineon 22 2 w1, w2 wire 23 1 l1 39mh, 0,6a b82731-m2601-a30 epcos 24 2 l2, l3 1uh 5mm 744772010 wrth 25 1 r1 4k7, 1% 1206 26 1 r2 4k7, 1% 1206 27 1 r3 0,56k 1206 28 1 r4 1,3k 1206 29 1 r5 4,7k 1206 30 1 r6 10r 1206 31 1 r9 39k, 1w 10mm 32 1 r10 1,3r, 0,6w, 1% 10mm 33 1 r11 1,3r, 0,6w 1% 10mm 34 1 r14 4,7r 10mm 35 1 r16 100r 1206 36 1 r15 120r 1206 37 1 tr1 e25 bobbin horizontal see transformer construction kaschke 38 3 x1, x2, x3 connector 2pol. 39 1 label * = not assembled
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 8 from 15 EVAL3DS01G28W v1.2 transformer construction
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset p age 9 from 15 EVAL3DS01G28W v1.2 performance data fig. 5: efficiency fig. 6: standby power standby power @ 250mw pout 410 420 430 440 450 460 470 480 490 500 85 135 185 235 vacin [v] pacin [mw] efficiency 0,00 0,20 0,40 0,60 0,80 1,00 0 5 10 15 20 25 30 pout [w] efficiency vin = 85vac vin = 230vac
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset page 10 from 15 EVAL3DS01G28W v1.2 crossregulation -1 1 3 5 7 9 11 13 15 0,2 0,4 0,6 0,8 1 1,2 1,4 iout12 [a] vout12 [v] iout5 = 0,5a iout5 = 1a iout5 = 1,5a iout5 = 2a fig. 7: crossregulation line regulation 0 2 4 6 8 10 12 14 85 135 185 235 vacin [v] vout [v] 5v 12v fig. 8: line regulation
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset page 11 from 15 EVAL3DS01G28W v1.2 fig. 9: emc measurement
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset page 12 from 15 EVAL3DS01G28W v1.2 references [1] ice3ds01g for off-line switch mode power supplies application note, infineon technologies [2] ice2axxx for off-line switch mode power supplies application note, infineon technologies [3] f2+ ice3ds01g off-line smps current mode controller with integrated 500v startup cell datasheet, infineon technologies note: the built-in transformer does not comply with en60950 sa fety requirements in respect of electrical isolation.
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset page 13 from 15 EVAL3DS01G28W v1.2 change service revision history application note EVAL3DS01G28W actual release: v1.2 dat e:11.08 .2010 previous release: v1.1 page of actual rel. page of prev. rel. subjects changed since last release ---------- change to EVAL3DS01G28W 15 15 part list for questions on technology, delivery and prices please contact the infineon technologies offices in germany or t he infineon technologies companies and representatives worldwide: see the address list on the last page or our webpage at http://www.infineon.com cool mos and cool set are trademarks of infineon technologies ag. edition 2010-08-1 1 published by infineon technologies ag, st.-martin-strasse 53, d-81541 mnchen ? infineon technologies ag 2000. all rights reserved. attention please! the information herein is given to describe certain component s and shall not be considered as warranted characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not lim ited to warranties of non-infringement, regarding circuits, des criptions and charts stated herein. infineon technologies is an approved cecc manufacturer. information for further information on technology, delivery terms and condi tions and prices please conta ct your nearest infineon technologi es office in germany or our infineon technologies representatives worldwide (see address list). warnings due to technical requirements co mponents may contain dangerous substances. for info rmation on the types in question please cont act your nearest infineon technologies office. infineon technologies components may only be used in life-support dev ices or systems with the express written approval of infin eon technologies, if a failure of such components can reasonably be ex pected to cause the failure of that life-support device or sy stem, or to affect the safety or effectiveness of that device or system. life suppor t devices or systems are intended to be implanted in the human bod y, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered. we listen to your comments any information within this dokument that y ou feel is wrong, unclear or missing at all? your feedback will help us to continously improve the quality of this dokument. please send your proposal (including a reference to this dokument) to: mcdoku.comment@infineon.com
lcd monitor smps evaluati on board with ice3ds01g www.infineon.com/coolset page 14 from 15 EVAL3DS01G28W v1.2 infineon goes for business excellence ?business excellence means intelligent approaches and clearly defined processes, which are both c onstantly under review and ultimately lead to good operating results. better operating results and busine ss excellence mean less idleness and wastefulness for all of us, more p rofessional succes s, more accurate information, a better overview and, thereby, less frustration and more satisfaction.? dr. ulrich schumacher

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