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evaluates: max17681 for isolated +24v output configuration max17681 evaluation kit general description the MAX17681EVKITF is a fully assembled and tested circuit board that demonstrates the performance of the max17681 high-eficiency, iso-buck dc-dc converter. the ev kit operates over a wide input-voltage range of 17v to 36v and uses primary-side feedback to regulate the output voltage. the ev kit output is programmed to +24v at 100ma, with 8% output voltage regulation. the ev kit comes installed with the max17681 in a 10-pin (3mm x 2mm) tdfn package. features 17v to 36v input voltage range +24v, 100ma continuous current en/uvlo input 200khz switching frequency overcurrent protection no optocoupler delivers up to 2.4w output power overtemperature protection proven pcb layout 19-8438; rev 1; 4/16 ordering information appears at end of data sheet. quick start recommended equipment one 15vC60v dc, 0.5a power supply one resistive load 100ma sink capacity two digital multimeters (dmm) caution: do not turn on the power supply until all connections are completed. test procedure the ev kit comes with the default output configuration programmed to +24v. 1) verify that j1 is open. 2) verify that r7 is not installed. 3) set the power supply output to 24v. disable the power supply. 4) connect the positive terminal of the power supply to the v in pcb pad and the negative terminal to the nearest pgnd pcb pad. connect a 100ma resistive load across the +24v pcb pad and the gnd0 pcb pad. 5) connect a dmm conigured in voltmeter mode across the +24v pcb pad and the nearest gnd0 pcb pad. 6) enable the input power supply. 7) verify that output voltage is at +24v (with allowable tolerance of 8%) with respect to gnd0. 8) if required, vary the input voltage from 17v to 36v, and the load current from 0ma to 100ma and verify that output voltage is at +24v (with allowable tolerance of 8%). downloaded from: http:///
maxim integrated 2 www.maximintegrated.com evaluates: max17681 for isolated +24v output coniguration max17681 evaluation kit detailed description the MAX17681EVKITF evaluation kit (ev kit) is a fully assembled and tested circuit board that demonstrates the performance of the max17681 high efficiency, iso-buck dc-dc converter designed to provide an isolated power up to 2.4w. the ev kit generates +24v, 100ma from a 17v to 36v input supply. the ev kit features a forced pwm control scheme that provides constant switching- frequency of 200khz operation at all load and line conditions. the ev kit includes an en/uvlo pcb pad to monitor and program the en/uvlo pin of the max17681. the v pri pcb pad helps measure the regulated primary output voltage (v pri ). an additional reset pcb pad is available for monitoring the health of primary output voltage (v pri ). reset is pulled low if fb voltage drops below 92.5% of its set value. reset goes high impedance 1024 clock cycles after fb voltage rises above 95.5% of its set value. the programmable soft-start feature allows users to reduce the input inrush current. the iso-buck is a synchronous-buck-converter-based topology, useful for generating isolated outputs at low power level without using an optocoupler. the detailed procedure for setting the soft-start time, enable/uvlo divider, primary output voltage (v pri ) selection, adjusting the primary output voltage, primary inductance selection, turns-ratio selection, output capacitor selection, output diode selection and external loop compensation are given in max17681 ic data sheet. enable control (j1) the en/uvlo pin on the device serves as an on/off control while also allowing the user to program the input undervoltage-lockout (uvlo) threshold. j1 configures the ev kits output for turn-on/turn-off control. install a shunt across j1 pins 2-3 to disable v out . see table 1 for proper j1 configurations.note 1: the secondary output diodes d1 is rated to carry short-circuit current only for few 100s of ms and is not rated to carry the continuous short-circuit current. note 2: the iso-buck converter typically needs 10% minimum load to regulate the output voltage. in this design when the +24v rail is healthy, the u2 sinks the minimum load current required to regulate the output voltages within 8% regulation. table 1. enable control (en/uvlo) (j1) jumper settings *default position. shunt position en/uvlo pin v out j1 1-2 connected to v in always enabled 2-3 connected to gnd always disabled open* connected to midpoint of r1, r2 resistor-divider enabled at v in 15.5v downloaded from: http:///
maxim integrated 3 www.maximintegrated.com evaluates: max17681 for isolated +24v output coniguration max17681 evaluation kit ev kit performance report 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 efficiency (%) load current (ma) efficiency vs. load current toc1 v in = 36v v in = 24v v in = 17v +24v output 23.0 23.5 24.0 24.5 25.0 25.5 0 10 20 30 40 50 60 70 80 90 100 output voltage (v) load current (ma) output voltage vs. load current toc2 +24v output v in = 36v v in = 24v v in = 17v 1v /div 50 ma/div toc3 400 s/div v out ( ac) i out lo ad t ran sient r esp on se (lo ad curr ent from 50ma to 10 0ma o n + 24 v) downloaded from: http:///
maxim integrated 4 www.maximintegrated.com evaluates: max17681 for isolated +24v output coniguration max17681 evaluation kit #denotes rohs compliant. note: indicate that you are using the max17681 when contacting these component suppliers. ordering information component suppliers component information, pcb layout, and schematic see the following links for component information, pcb layout diagrams, and schematic. max17681f ev bom max17681f ev pcb layout max17681f ev schematic supplier website wurth electronik www.we-online.com murata americas www.murata.com panasonic corp. www.panasonic.com part type MAX17681EVKITF# evkit 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. ? 2016 maxim integrated products, inc. 5 evaluates: max17681 for isolated +24v output coniguration max17681 evaluation kit revision history revision number revision date description pages changed 0 3/16 initial release 1 4/16 updated general description section and bill of materials 1C2 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:///
s no designation qty description manufacturer partnumber-1 manufacturer partnumber-2 manufacturer partnumber-3 manufacturer partnumber-4 1 c1 1 1f10%, 50v,x7r ceramic capacitor (1206) murata grm31cr71h105ka61 kemet c1206c105k5rac murata grm31mr71h105ka88 2 c2 1 1f10% 16v x7r ceramic capacitor (0603) murata grm188r71c105ka12 kemet c0603c105k4rac tdk c1608x7r1c105k taiyo yuden emk107b7105ka 3 c3 1 0.033ufnf10%,25v, x7r ceramic capacitor (0402) murata grm155r71e333ka88 4 c4 1 0.082ufnf10%,16v, x7r ceramic capacitor (0402) murata grm155r71c823k kemet c0402c823k4rac 5 c5 1 820pf5%,50v,x7r ceramic capacitor (0402) murata grm155r71h821k kemet c0402c821k5rac 6 c6 1 10uf10%,16v, x7r ceramic capacitor (1206) murata grm31cr71c106kac7 7 c7 1 0.01uf10%, 50v, x7r ceramic capacitor (0402) murata grm155r71h103ka88 kemet c0402c103k5rac 8 c8 1 22uf, 20%, 50v, aluminum electrolytic capacitor 6.60*6.60mm, panasonic eeefk1h220p 9 c9 1 2.2uf10%,50v, x7r ceramic capacitor (1206) murata grm31cr71h225ka88 taiyo yuden umk316b7225k 10 c10 1 1000pf10%, 1500v, x7r ceramic capacitor (1206) avx 1206sc1 02kat 11 d1 1 100v/1a, powerdi?123 diode inc. dfls1100-7 12 j1 1 3-pin headers sullins electronics corp pec03saan 13 r1 1 3.01m ohm1% resistor (0402) vishay dale crcw04023m01fk 14 r2 1 261k ohm1% resistor (0402) vishay dale crcw0402261kfk 15 r3 1 110k ohm1% resistor (0402) vishay dale crcw0402110kfk 16 r4 1 10.5k??1%?resistor?(0402)? panasonic erj-2rkf1052 17 r5 1 3.74k??1%?resistor?(0402)? panasonic erj2rkf3741 18 r6 1 100k??5%?resistor?(0402) panasonic erj-2gej104x 19 r7 1 open (0402)
20 r8 1 22 ?? 1% ? resistor ? (0402) vishay ? dale ? crcw040222r0fk 21 r9 1 90.9k ?? 1% ? resistor ? (0402) panasonic ? erj \ 2rkf9092x 22 r10 1 10k ?? 1% ? resistor ? (0402) vishay ? dale ? crcw040210k0jn 23 t1 1 ep10, ? 8 \ pin ? smt, ? 80h,1.2a, ? (5 \ 8):(4 \ 1)=2.4:1 wurth ? electronics ? inc. ? 750342860 24 u1 1 max17681 ? tdfn10 ? 3*2mm ? iso ? buck ? dc \ dc ? converter max17681atb+ 25 u2 1 shunt ? regulator ?? sot25 diode ? inc. ?? tl431bw5 downloaded from: http:///
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sgnd pgnd pgnd 820pf 58 41 en/uvlo max17681atb+ en/uvloreset r9 90.9k 10k r8 u2 2.2uf 4 5 3 21 r10 gnd0 gnd0 22 t1 c9 +24v c a d1 vcc 750342860 1 0.01uf 3.74k packout 10.5k 100k 261k 1000pf 0.082uf 10uf 0.033uf 1uf 110k reset 22uf en/uvlo vcc 1uf gnd0 vin u1 87 3 11 9 10 1 6 4 2 pgnd j1 1 2 3 c2 c1 r1 r2 c5 c4 r5 r6 c6 r3 r7 c7 r4 c8 2 vpri 3.01m c3 5 reset sgnd c10 vin ep en/uvlovcc lx pgndfb reset comp ss gnd vin sec pri 5 8 41 + downloaded from: http:///

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