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evaluates: max17597 in a flyback configuration max17597 evaluation kit general description the max17597 evaluation kit (ev kit) is a fully assembled and tested circuit board that demonstrates an isolated 20w lyback dc-dc converter. the circuit uses the devices peak-current-mode controller in a 16-pin tqfn package with an exposed pad. the ev kit demonstrates the ics cycle-by-cycle current-limit, soft-start, and en/ uvlo features. the ev kit circuit output is conigured for an isolated 24v and provides up to 833ma of output current. the ev kit is conigured to operate at a 200khz switching frequency. an optocoupler, along with the transformer, provides galvanic isolation between input and output, up to 1500v rms . features 18v to 36v input range isolated output: 24v dc at 20w cycle-by-cycle current limit resistor programmable uvlo/ovi threshold low-cost flyback design galvanic isolation up to 1500v rms proven pcb layout fully assembled and tested ordering information appears at end of data sheet. 19-7726; rev 0; 7/15 quick start recommended equipment one 18v to 36v dc, 2a power supply electronic load four digital multimeters (dmm) max17597-24v evkita# warning: do not turn on the power supply until all connections are completed. wear protective eye gear at all times. do not touch any part of the circuit with bare hands or conductive materials when powered up. make sure all high-voltage capacitors are fully discharged before handling. allow 5 minutes after disconnecting the input power source before touching circuit parts. equipment setup and test procedure 1) set the power supply to +24vdc. disable the power-supply output. 2) connect the positive terminal of the power supply to the vin pcb pad and the negative terminal to the nearest pgnd pcb pad. connect the positive terminal of the electronic load to the vout pcb pad and the negative terminal to the nearest gnd0 pcb pad. 3) set the electronic load to constant-current mode and disable the electronic load. 4) connect a dmm conigured in voltmeter mode across the vout pcb pad and the nearest gnd0 pcb pad. 5) connect another dmm conigured in voltmeter mode across the vout pcb pad and the gnd0 pcb pad. 6) enable the power supply. 7) enable the load and adjust the current to 833ma. 8) verify that the output voltmeter displays 24v 9) if required, vary the input voltage from 18v to 36v, the load current from 0 to 833ma, and verify that the output voltage is 24v. downloaded from: http:///
maxim integrated 2 www.maximintegrated.com evaluates: max17597 in a flyback configuration max17597 evaluation kit detailed description the max17597 ev kit provides a proven design to evaluate the high-eficiency, dc-dc lyback converter in a space- saving 16-pin tqfn package. the ev kit is conigured for a 24v output voltage that can supply up to 840ma of current. the ev kit features a 200khz ixed switching frequency for optimum eficiency and component size. this ev kit uses the peak-current-mode, pulse-width- modulating (pwm) controller ic in a 16-pin tqfn package with an exposed pad. this pwm controller varies the duty cycle to compensate for the variation in input voltage (v in ) and the output load to maintain a constant output voltage. the duty cycle determines the on/off duration of the mosfet (q1). the detailed description of lyback-design methodology, as well as the calculations for component value selection, are described in application note 5504, designing flyback converters using peak-current-mode controllers . the details of soft-start time programming, programming output voltage, peak-current limit setting, switching frequency setting, and the en/uvlo, ovi settings are described in the max17595Cmax17597 ic data sheet. note: the ev kit is shipped with the frequency dithering disabled and the dither/sync pin shorted to sgnd by a 0 resistor. to set the desired frequency dither, replace resistor r23 with a capacitor of appropriate value, as detailed in the max17595Cmax17597 ic data sheet. the dither/sync pcb pad is available for monitoring the signal at the dither/sync pin. downloaded from: http:///
maxim integrated 3 www.maximintegrated.com evaluates: max17597 in a flyback configuration max17597 evaluation kit ev kit performance report 0 10 20 30 40 50 60 70 80 90 100 0 200 400 600 800 efficiency (%) load current (ma) efficiency vs. load current toc1 v in = 36v v in = 24v v in = 18v 500mv/div 500ma/div toc3 4.00ms/div i out load transient response (load current stepped from 400 to 833 m a) v out (ac) 23.95 23.98 24.01 24.04 24.07 24.1 24.13 24.16 24.19 0 100 200 300 400 500 600 700 800 output voltage (v) load curr ent (ma) output vo lt age vs . lo ad curr ent toc2 v in = 18 v v in = 36 v v in = 24 v toc4 bode plot gain phase f cr = 5.74khz, phase margin = 73.0 downloaded from: http:///
maxim integrated 4 www.maximintegrated.com evaluates: max17597 in a flyback configuration max17597 evaluation kit figure 1. max17597 ev kit component placement guidecomponent side 1.0 downloaded from: http:///
maxim integrated 5 www.maximintegrated.com evaluates: max17597 in a flyback configuration max17597 evaluation kit figure 2. max17597 ev kit pcb layoutcomponent side 1.0 downloaded from: http:///
maxim integrated 6 www.maximintegrated.com evaluates: max17597 in a flyback configuration max17597 evaluation kit figure 3. max17597 ev kit pcb layoutsolder side 1.0 downloaded from: http:///
maxim integrated 7 www.maximintegrated.com evaluates: max17597 in a flyback configuration max17597 evaluation kitnote: indicate that you are using the max17597 when contacting these component suppliers. #denotes rohs compliant. component suppliers supplier website coilcraft, inc. www.coilcraft.com murata americas www.murata.com panasonic corp. www.panasonic.com component list see the links below for component information and sche - matics: max17597 ev bom max17597 ev schematic ordering information part type MAX17597FBEVKIT# ev kit downloaded from: http:///
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice at any time. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ? 2015 maxim integrated products, inc. 8 evaluates: max17597 in a flyback configuration max17597 evaluation kit revision history revision number revision date description pages changed 0 7/15 initial release for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///
pgnd gnd0 gnd0 24v,20w 63v gnd0 gnd0 18v to 36v 1000pf 1% 50v open 1uf max17597ate+ open 1% 2.55k 0.1uf 7.68k 3.9k 1% 10uf open 50v 0.5% 10k 10.7k 1% 390pf 100uf 3k 0.22uf 10uf 50v tl431aqdbzrq1 0.22uf 4.7uf 50v 680pf 49.9k 470 1% 0.1uf 0.082 1% 100 1% 453 22k 50v 10uf 1% 50v cu8758-al stth4r02b 1% 100 220pf 49.9k 1% 1% 10uf open open 0 0 47 open open 0.1uf 1% 280k 0.01uf 10k 0.5% r12 r14 r7 r5r6 u1 c21 dither r23 c4 u3 c12 c17 d2 c20 r22 c13 r19 r2 r20 r18 t1 r21c19 gnd0 vout vin pgnd sgnd ovi en/uvlo r11 r1 r3 r4 r13 r8 r17 r16 r15 d3 c1 c16 q1 d1 r10 r9 u2 c3 c11 c10 c9 c2 c8 c15 c14 c6 c7 c5 vin vdrv vfb u3-2 vfb vin vout vout u3-2 vdrv 2 8 13 14 7 3 1016 11 6 17 15 4 9 5 2 3 4 1 3 2 87 6 5 4 3 2 1 2 1 3 2 1 3 dither ep ovi en/uvlo in vdrv ndrv pgnd cs sgnd ssfb comp rt slope in in g s d + downloaded from: http:///
s no designation qty description manufacturer partnumber-1 manufacturer partnumber-2 manufacturer partnumber-3 manufacturer partnumber-4 manufacturer partnumber-5 1 c1 1 100f 20%, 63v,aluminum- electrolytic (smt (case_g)) panasonic eee- fk1j101p 2 c2 1 4.7f10% 50v x7r ceramic capacitor (1210) murata grm32er71h475ka88k kemet c1210c475k5rac 3 c3 1 0.22f10% 50v x7r ceramic capacitor (0805) murata grm21br71h224ka kemet c0805c224k5rac tdk cgj4j2x7r1h224k 125aa 4 c4 1 0.22f10% 100v x7r ceramic capacitor (0805) murata grm21ar72a224kac5 kemet c0805c224k1rac 5 c5,c14 2 0.1f10% 16v x7r ceramic capacitor (0603) murata grm188r71c104k kemet c0603c104k4ra tdk c1608x7r1c104k murata gcm188r71c104k a37 venkel c0603x7r160- 104kne 6 c6 1 1000pf5%,50v,x7r ceramic capacitor (0402) murata grm155r71h102ja01d 7 c7 1 1f10% 25v x7r ceramic capacitor (0603) murata grm188r71e105ka12d murata cga3e1x7r1e105k 8 c8 1 0.01f10% 50v x7r ceramic capacitor (0603) murata grm188r71h103k kemet c0603c103k5rac venkel ltd c0603x7r500- 103kne 9 c9-c11,c17 4 10f10% 50v x7r ceramic capacitor (1210) murata grm32er71h106ka12l murata cl32b106kbjnnn 10 c15 1 0.1f10% 50v x7r ceramic capacitor (0603) panasonic ecj- 1vb1h104k 11 c16 1 680pf10%,50v,x7r ceramic capacitor (0603) murata grm188r71h681ka01 12 c19 1 390pf5% 100v x7r ceramic capacitor (0805) murata grm2165c2a391ja01 13 c20 1 220pf10%,250v,x7r ceramic capacitor (0603) murata grm188r72e221k 14 d1 1 100v/1a,smt (sod-123fl) micro commercial smd110pl 15 d2 1 200v /4a, dpak st microelectronics stth4r02b 16 d3 1 100v/0.3a,smt (sod-123) diodes incorporated 1n4148w-7-f 17 q1 1 100v/63a/140w, power mosfet(dpak) international rectifier irlr3110ztrpbf 18 r1 1 3k? 5 %,1.0w resistor (2512) vishay dale crcw25123k00jn 19 r3 1 22k? 1 %0 .1w resistor (0603) vishay dale crcw060322k0fk 20 r4,r10 2 49.9k? 1% 0.1w resistor (0603) vishay dale crcw060349k9fk panasonic erj- 3ekf4992v 21 r5 1 280k? 1% 0.1w resistor (0603) vishay dale crcw0603280kfk 22 r6 1 10.7k? 1% 0.1w resistor (0603) vishay dale crcw060310k7fk panasonic erj- 3ekf1072v 23 r7,r12 2 10k? 0.5% 0.063w resistor (0603) panasonic erj- 3rbd1002v 24 r8 1 100? 1% 0.1w resistor (0603) vishay dale crcw0603100rfk panasonic erj- 3ekf1000v 25 r9 1 0? 0% 0.1w resistor (0603) vishay dale crcw06030000zs vishay dale mcr03ezpj000 vishay daleerj- 3gey0r00v 26 r11 1 0.082? 1% 0.5w resistor (1210) semiconductor mcr25jzhfsr082 27 r13 1 470? 1% 0.1w resistor (0603) vishay dale crcw0603470rfk 28 r14 1 7.68k? 1% 0.1w resistor (0603) vishay dale crcw06037k68fk 29 r15 1 3.9k? 1% 0.1w resistor (0603) vishay dale crcw06033k90fk 30 r16 1 2.55k? 1% 0.1w resistor (0603) vishay dale crcw06032k55fk 31 r17 1 453? 1% 0.1w resistor (0603) panasonic erj- 3ekf4530v bill of materials (bom) - revision 5/15 downloaded from: http:///
32 r21 1 470? 5% 0.5w resistor (1210) panasonic erj- 14yj470u 33 r22 1 100? 5% 0.66w resistor (1206) panasonic erjp08j101v 34 r23 1 0? 5% resistor (0603) samsung electronics rc1608j000cs bourns cr0603-j/- 000elf yageo ph rc0603jr-070rl 35 t1 1 33h, (3,4-1,2):(7,8- 5,6)=0.5416:1 coilcraft cu8758-al 36 u1 1 max17597 tqfn16-ep 3x3 max17597ate+ 37 u2 1 0.1a adjustable precision shunt regulator(sot-23) texas instruments tl431aqdbzrq1 38 u3 1 6v/0.05a,0.2w phototransistor optocoupler (nsoic4) avago technologies acpl- 217-56ae 1 c12,c13 2 n/a 2 c21 1 n/a 3 r2,r18-r20 4 n/a do not purchase(dnp) downloaded from: http:///

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