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1 www.irf.com rd-0622 IRDC3622S user guide for current s haring IRDC3622S evaluation board using irf6622 and irf6678 directfet mosfets table of contents page description 2 board features 2 connections & operating instructions 3 layout 5 schematic 10 bill of materials 11 waveforms 12 mlpq package 20 downloaded from: http:///
2 www.irf.com rd-0622 user guide for current s haring IRDC3622S evaluation board using irf6622 and irf6678 directfet mosfets description this user guide contains the schematic and bill of materials for the IRDC3622S evaluation board. the guide describes operation and use of the evaluation board itself. the ir3622 ic is a dual channel synchronous buck controller, providing a cost-effective, high performance and flexible solution. the two channels can be configured to either two independent outputs or current sharing single output. the current share configuration is ideal for high current applications. key features offered by the ir3622 include configurable dual output, output voltage tracking, power up/down sequencing, programmable soft- start ramp, pre-bias start-up, latched over-voltage protection, thermal protection, accurate reference voltage, on-board regulator, threshold sensitive enable input, programmable switching frequency up 600khz and input under-voltage lockout for proper start-up. an output over-current protection function and a hiccup current limit are implemented by sensing the voltage developed across the on-resistance of the synchronous rectifier mosfet for optimum cost and performance. detailed application information for the ir3622 integrated circuit is available in the ir3622 data sheet. board features the board is designed for 1.8v output up to 60a load using ir3622 in current share configuration. v in = +12v, (13.2v max) v o = +1.8v 3% @ 60a v o (ripple)= 50mv maximum f s =375khz l=270nh (10x10mm) c o =4x220uf (sp) + 10x10uf (ceramic 0805) two 10x10mm inductors combined with 4x220 sp capacitors and 10x10uf ceramic capacitors form a compact solution. the input voltage start threshold of the converter is set about 10v using enable pin and two external resistors (r22b1 and r22b2). the converter has the option to sequence with other supplies using seq and track pins (r6b1, r22b3 and r22b4). these pins are pulled high as default. downloaded from: http:///
3 www.irf.com rd-0622 connections and operating instructions input supplies connection: two supplies are required for this board, 3.3v and 12v. both supplies should be well regulated. the 3.3v supplies the pull-up resistor for power good. the track and seq pins are also pulled high using 3.3v. connect the 3.3v supply to tp3(+) and tp4(gnd). the12v supply is the bus voltage; it also biases ir3622 ic and should be able to source 15a current. connect this supply either to 8-pin connector (j1b) or solder other connectors, such as banana jacks, to the exposed pads. note: for correct start up the 3.3v supply needs to be powered first. output load connection: the load can be connected to the large screw-terminals or solder other connectors such as banana jacks, to the exposed pads. tb1b, tb2b v out ( +1.8v) tb3b, tb4b ground of v out ground of v in j1b v in (+12v) tp4 ground of the 3.3v supply tp3 +3.3v supply connection signal name table i. connections downloaded from: http:///
4 www.irf.com rd-0622 connection diagram input, output, and control signals are accessible through test points as listed in table ii. test points fig. 1: connection diagram of the IRDC3622S evaluation board. - + input supply (+12v-15a) - input supply (+3.3v) + 0-60a load j1b table ii. test points remote sensing at terminal block, for bode plot measurement rem_sen1v8 tp26, tp27 test point for the output voltage v out test tp23 output voltage and ground v out tp10, tp14 enable input of the 3622 ic enable tp34 ground gnd tp18, tp24 sets the type of power up/down sequencing track tp20 power good output pgd_1v8 tp8 enable input for sequence and tracking seq tp19 external synchronization signal sync tp25 soft start ss1 tp12 description signal name test point downloaded from: http:///
5 www.irf.com rd-0622 layout the IRDC3622S is an eight-layer board. the top and bottom layers are 2 oz. copper and the internal layers are 1 oz. copper. the switching mosfets, inductors, 270uf input capacitors, 220uf output capacitors, and some smaller passive components are mounted on the top side of the board. the ir3622 ic and the rest of passive components are mounted on the bottom layer. the directfet technology is used for mosfets. fig. 2: parts placement, top layer. fig. 3: parts placement, bottom layer. downloaded from: http:///
6 www.irf.com rd-0622 fig. 4: board layout, top layer. fig. 5: board layout, mid layer 1. downloaded from: http:///
7 www.irf.com rd-0622 fig. 6: board layout, mid layer 2. fig. 7: board layout, mid layer 3. downloaded from: http:///
8 www.irf.com rd-0622 fig. 8: board layout, mid layer 4. fig. 9: board layout, mid layer 5. downloaded from: http:///
9 www.irf.com rd-0622 fig. 10: board layout, mid layer 6. fig. 11: board layout, bottom layer. downloaded from: http:///
10 www.irf.com rd-0622 unless otherwise specified: capacitors are 10% max, 16v min, x5r min resistors are 1%, 100mw input caps must supply 13.5arms at 6 0a load fig. 12: schematic of the IRDC3622S board. tp8 tp25 tp12 c13b 220uf c19b 220uf l1b270nh pa0515.271 1 2 c12b 1uf th c85b1 empty c32b 0.1uf c86b1 empty c3b 10uf 1uf c87b1 empty c88b1 empty c24b 1.2nf c81b1 empty c82b1 empty r24b 1m c85b 10uf,6.3v c86b 10uf,6.3v c87b 10uf,6.3v c88b 10uf,6.3v c81b empty r99b 100 c82b empty tp34 c28b 100pf c2b 10uf c34b 0.1uf r11b 23.2k r18b 6.65k r8b 432 not stuf f 1 ir3622mlpq c25b 2.2nf c35b 10uf,6.3v r19b 8.66k r22b2 1.4k 1 2 p3v3_stby r17b 7.15k p1v8 c85b2 10uf,6.3v c86b2 10uf,6.3v r15b 9.09k r21b 7.15k c87b2 empty c22b 10pf c88b2 empty c16b 10pf c30b open p1v8 r10b open r7b open vout3 c17b open c11b open r15b1 0 r324b 4.99k c6b 10uf r20b 0.732k c14b 1uf tb1b 1 2 3 4 5 6 tb2b 1 2 3 4 5 6 c29b 0.22uf tb3b 1 2 3 4 5 6 tb4b 1 2 3 4 5 6 c1b 0.22uf p1v8_l2 pgd_1v8_h c36b 10uf,6.3v c37b 10uf,6.3v c38b 10uf,6.3v q12b irf6678 mx 2 5 4 1 3 6 7 l2b 270nh pa0515.271 1 2 c83b empty r5b 432 c84b empty c9b 0.22uf p1v8_l1 r14b 9.09k c27b 33pf c7b 1uf q22b irf6678 mx 2 5 4 1 3 6 7 c26b 1.0nf r12b 0 1 2 r13b 0 1 2 r9b 6.32k c18b 1uf signal ground joins gnd at 1 point r4b 6.32k remote sense at ter minal bl ock rt = 23.2k, fs = 375khz q21b irf6622 sq 2 5 4 1 3 6 7 tp10 q11b irf6622 sq 2 5 4 1 3 6 7 tp26 tp27 c14b1 1uf c15b 220uf r6b1 0 1 2 c20b 220uf tp23 tp24 tp14 c15b1 empty c20b1 empty c15b2 empty c20b2 empty p3v3_stby u1b ir3622 mlpq vsen1 22 ss2 5 vcc 30 vch 1 17 pgood1 29 trac k 32 ss1 19 hdrv 2 8 gnd 28 comp1 20 vch 2 7 fb1 21 vsen2 2 pgnd2 10 comp2 4 hdrv 1 16 vp2 26 rt 1 vcl 12 vout3 31 ocset1 18 ldrv 1 13 pgnd1 14 fb2 3 ocset2 6 enable 9 ldrv 2 11 sync 23 vref 27 vp1 25 p g ood2 24 pad1 33 pad2 34 pad3 35 pad4 36 pad5 37 pad6 38 pad7 39 pad8 40 pad9 41 seq 15 cob 0.1uf tp19 tp18 j1b gnd1 1 gnd2 2 gnd3 3 gnd4 4 +12v4 8 +12v3 7 +12v2 6 +12v1 5 th 1 9 2 10 c10b p12vb + c80b 270uf 1 2 r22b3 not stuf f 1 2 r22b1 10k 1 2 + c39b 270uf 1 2 r22b4 2 c5b 10uf c8b 0.47uf,25v m1b heatsink mount 1 r22b 10 1 2 tp3 tp4 p3v3_stby d2b bat54ws a_sod323_b 1 2 d1b bat54ws a_sod323_b 1 2 tp20 p3v3_stby r22b5 0 1 2 c3v 1 10uf downloaded from: http:///
11 www.irf.com rd-0622 bill of materials item qty reference v alue description pcb footprint manufacturer part number 13 c32b, c34b, cob 0.1uf 0.1uf-0603-25v-x7r-10% a_mc-0603 panasonic ecj1vb1e104 21 c30b open a_mc-0603 35 c2b, c3b, c5b, c6b, c3v1 10uf 10uf-1206-16v-x7r-20% a_mc- 1206 murata grm31cr61c106kc31l 46 c7b, c10b, c12b, c14b, c18b, c14b1 1uf 1uf, 0603, 16v, x7r- 10% a_mc-0603 murata grm188r71c105ka12d 51 c8b 0.47uf 0.47uf-0603-25v-x7r-10% a_ mc-0603 murata grm188r71e474ka12d 63 c1b, c9b, c29b 0.22uf 0.22uf-0603-16v-x7r-10% a_ mc-0603 panasonic ecj1vb1c224 72 c11b, c17b open a_mc-0603 84 c13b, c15b, c19b, c20b 220uf 220uf-d4-2v-9mohm-sp a_mc-6mm panasonic eefsx0d221r 92 c16b, c22b 10pf 10pf-0603-50v-c0g-5% a_mc-0603 panasonic ecj1vc1h100d 10 1 c24b 1.2nf 1200pf-0603-50v-x7r-10% a_m c-0603 panasonic ecj1vb1h122k 11 1 c25b 2.2nf 2200pf-0603-50v-x7r-10% a_m c-0603 panasonic ecj1vb1h222k 12 1 c26b 1.0nf 1000pf-0603-50v-x7r-10% a_m c-0603 panasonic ecj1vb1h102k 13 1 c27b 33pf 33pf-0603-50v-c0g-5% a_mc-0603 panasonic ecj1vc1h330j 14 1 c28b 100pf 100pf-0603-50v-c0g-5% a_mc-0603 panasonic ecj1vc1h101j 15 10 c35b, c36b, c37b, c38b, c85b, c86b, c87b, c88b, c85b2, c86b2 10uf 10uf-0805-6.3v-x5r-10% a_mc-0805 avx 08056d106kat2a 16 2 c39b, c80b 270uf 270uf-8mohm-16v a_mc138-336d sanyo 16sepc270m 17 6 c81b, c81b1, c82b, c83b, c84b, c82b1 open a_mc-1206 18 4 c15b1, c15b2, c20b1, c20b2 open a_mc-6mm 19 6 c85b1, c86b1, c87b1, c87b2, c88b1, c88b2 open a_mc-0805 20 2 d1b, d2b bat54ws schottky, sod323, 30v, 0.2a a_sod323_b ir bat54ws 21 1 j1b atx8pins conn,8 pins,2 rows pwr2x4 molex 39299082 22 2 l1b, l2b 270nh a_induct-515 pulse pa0515.271 23 2 q11b, q21b irf6622 sq irf6622 sq 25v ir_dirfet_sq ir irf6622 24 2 q12b, q22b irf6678 mx irf6678 mx 30v ir_dirfet_mx ir irf6678 25 1 r324b 4.99k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx4991 26 2 r4b, r9b 6.34k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx6341 27 2 r5b, r8b 432 res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx4320 28 2 r7b, r10b open a_cr-0805 29 1 r11b 23.2k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx2322 30 5 r12b, r13b, r6b1,r15b1,r22b5 0 res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpj000 31 1 r14b 9.09k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx9091 32 1 r15b 9.09k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx9091 33 1 r22b 10 res, 0603, 1%, 1/10w a_cr-0603 panasonic erj-3ekf10r0v 34 1 r99b 100 res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx1000 35 2 r17b, r21b 7.15k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx7151 36 1 r18b 6.65k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx6651 37 1 r19b 8.66k res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx8661 38 1 r20b 732 res, 0603, 1%, 1/10w a_cr-0603 rohm mcr03ezpfx7320 39 1 r24b 1m res, 0603, 1%, 1/10w a_cr-0603 yageo rc0603fr-071ml 40 1 r22b1 10k res, 0603, 1%, 1/10w a_cr-0603 yageo rc0603fr-0710kl 41 1 r22b2 1.4k res, 0603, 1%, 1/10w a_cr-0603 panasonic erj-s03f1401v 42 2 r22b3, r22b4 open a_cr-0603 43 4 tb1b, tb2b,tb3b, tb4b t. block 1 pin terminal block tb_1_0 keystone 8197 44 15 tp3, tp4, tp8, tp10, tp12, tp14, tp18, tp19, tp20, tp23, tp24, tp25, tp26, tp27, tp34 tp testpoint v1054_nd vector k24a/m 45 1 u1b ir3622 mlpq controller a_mlpq32-0p5mm_via_a international rectifier ir3622 46 1 m1b heat sink 26.65 x 19.48 x 22.48 (l x w x h) (mm) thermaflo 7201599 47 2 tim1b, tim2b thermal interface material 10.20 x 19.12 (l x w) (mm) bergquist bg420753 48 1 sc rw1b philips pan head screw stainless a-2(18-8), 2mm x .4 x 5mm bolt depot 6812 downloaded from: http:///
12 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, room temperature, no air flow fig.13: start-up sequence at no load. ch 1 :v in , ch 2 :v ss , ch 4 :v o fig.14: start-up sequence into 60a load. ch 1 : v in , ch 2 : v ss , ch 3 : enable, ch 4 : v o fig.15: start-up sequence into 60a load. ch 1 : v in , ch 2 : v ss , ch 3 : power good, ch 4 : v o fig.16: output voltage ripple at 40 a. fig.17: transient response. ch 1 : v o , ch 4 : i o (0-10a) fig.18: transient response. ch 1 : v o , ch 4 :i o (0-20a) downloaded from: http:///
13 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, room temperature, no air flow fig. 20: transition from hiccup to normal operation. ch 2 : v out , ch 3 : v ss fig.19: transient response i out (0-30a). ch1: v out fig. 22: dead-times on v l2 at 40 a. fig. 21: dead-times on v l1 at 40a. fig. 24: v l1 -turn-off dead-time at 40a. fig. 23: v l1 -turn-on dead-time at 40a. downloaded from: http:///
14 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, room temperature, no air flow fig. 25: v l2 -turn-on dead-time at 40a. fig. 26: v l2 -turn-off dead-time at 40a. fig. 28: hdrv2 and ldrv2 at 20a. ch 1 : ldrv2, ch 2 : hdrv2 fig. 27: hdrv1 and ldrv1 at 20a. ch 1 : ldrv1, ch 2 : hdrv1 fig. 30: compensator signals at no load. ch 1 : comp1, ch 2 : comp2 fig. 29: compensator signals at start-up to a 20a load. ch 1 : comp1, ch 2 : comp2 downloaded from: http:///
15 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, room temperature, no air flow fig. 31: pre-bias test at 1v. ch 1 : v out , ch 2 :v ss fig. 32: inductor points at 60a load. ch 2 : v l1 , ch 3 :v l2 downloaded from: http:///
16 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, 45 c ambient temperature, 200lfm air flow fig. 33: efficiency versus load current at 45 c with heat sink and 200lfm air flow. 70 72 74 76 78 80 82 84 86 88 90 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 output current (amps) efficiency % fig. 34: power loss versus load current at 45 c with heat sink and 200lfm air flow 0 5 10 15 20 25 0 5 10 15 20 25 30 35 40 45 50 55 60 output current (amps) watts downloaded from: http:///
17 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, room temperature, no air flow 1.72 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 0 5 10 15 20 25 30 35 40 45 50 55 60 load current (a) output voltage (v) fig. 35: output voltage versus load current. 1.8v+3% 1.8v-3% fig. 36: current sharing of the phases versus load current. 0 2 4 6 8 10 12 14 16 18 20 22 5 1 01 52 02 53 03 54 0 output current (a) inductor currents (a) il1 il2 downloaded from: http:///
18 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, room temperature, no air flow fig. 37: bode plot at 20 a load shows a bandwidth of 75khz and phase margin of 42.7 degree. fig. 38: bode plot at 40 a load shows a bandwidth of 81khz and phase margin of 42.1 degree. downloaded from: http:///
19 www.irf.com rd-0622 typical operating waveforms vin=12v, vo=1.8v, io=0-60a, fs=375 khz, room temperature, no air flow fig. 39: bode plot at 60 a load shows a bandwidth of 62.9khz and phase margin of 43.6 degree. fig. 40: thermal image at 60 a load, without heatsink, and with no air flow, test points are synchronous rectifier directfets. downloaded from: http:///
20 www.irf.com rd-0622 tape & reel orientation ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 this product has been designed and qualified for the industrial market. visit us at www.irf.com for sales contact information data and specifications subject to change without notice. 1/23/2007 downloaded from: http:///

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