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1 ? an1482.0 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright intersil americas inc. 2009. all rights reserved all other trademarks mentioned are the property of their respective owners. ISL9440CEVAL1Z: triple pwm step-down synchronous buck controller and one ldo ISL9440CEVAL1Z evaluation board the ISL9440CEVAL1Z evaluation board features the isl9440c. the isl9440c is q uad-output controller that integrates three pwm synchr onous buck controllers and one low-dropout linear regulator co ntroller. the isl9440c offers programmable soft-start, i ndependent enable functions and integrates ov/oc/ot protecti on. the current mode control architecture and internal compensation network keep peripheral component counts minimized. 600khz switching frequency can minimize inductor size while the strong gate driver is able to deliver 12a to each pwm channel. table 1 shows the difference in terms of isl944xx family features. the ISL9440CEVAL1Z is easy to set up to evaluate the performance of the isl9440c. pl ease refer to the ?electrical specifications? for typical performance summary. table 1. features of isl944xx family part number early warning switching frequency (khz) soft-starting time (ms) isl9440 yes 300 1.7 isl9440a yes 600 1.7 isl9441 no 300 1.7 isl9440b yes 300 programmable isl9440c yes 600 programmable figure 1. ISL9440CEVAL1Z evaluation board application note june 30, 2009
2 an1482.0 june 30, 2009 what?s inside the evaluation board kit contains the following materials: ? the ISL9440CEVAL1Z ? the isl9440b, isl9440c datasheet ? this eval kit document recommended equipment the following materials are recommended to perform testing: ? 0v to 20v power supply with at least 10a source current capability ? three electronic loads capable of sinking current up to 7a ? digital multimeters (dmms) ? 100mhz quad-trace oscilloscope ? signal generator (for load transient tests) quick test guide 1. ensure that the circuit is co rrectly connected to the supply and electronic loads prior to applying any power. please refer to figure 2 for proper set-up. 2. connect jumpers j3, j4 and j5 in the enx positions. 3. turn on the power supply 4. adjust input voltage vin within the specified range and observe output voltage. the output voltage variation should be within 3%. 5. adjust load current within the specified range and observe output voltage. the output voltage variation should be within 3%. 6. use oscilloscope to observe output voltage ripple and phase node ringing. for accurate measurement, refer to figure 3 for proper test set-up. electrical specifications recommended operation conditions unless otherwise noted. refer to schematic and typical performance curves. parameter test conditions min typ max units v in all outputs are in regulation 6.0 12 16 v v out 1 0.97 1.00 1.03 v v out 2 3.25 3.32 3.4 v v out 3 4.85 5.0 5.15 v v out 4 2.43 2.50 2.57 v pwm1 rated current v in =12v, t a = +25c, no forced airflow, all three pwm outputs are fully loaded 67a pwm2 rated current 67a pwm3 rated current 45a ldo rated current r7 = 0 , r4 is not populated 0.8 1.0 a v out 1 peak-to-peak ripple v in = 12v, all three pwm outputs are fully loaded, oscilloscope is with full bandwidth 19.8 mv p-p v out 2 peak-to-peak ripple 59.6 mv p-p v out 3 peak-to-peak ripple 66.5 mv p-p application note 1482
3 an1482.0 june 30, 2009 load transient circuit set-up 1. select a soic8 n-channel mosfet with vdss breakdown > 20v. 2. install the load transient circuit as indicated on the schematic. refer to figure 4 for detail. 3. r27, r22 and r25 are 10k resistors for discharging the mosfet gates. 4. r26, r23 and r24 are current sensing resistors to monitor the load step. for accurate measurement, please use 5% tolerance sensing resistor or better. to alleviate thermal stress, use 0.1 or smaller resistance. the resistance of the sensing resi stors sets the current scale on the oscilloscope. 5. apply pulse square waveform across r27, r22 or r25. the duty cycle of the pulse waveform should be small (<5%) to limit thermal stress on current sensing resistor and the mosfets (m8, m6 or m7) 6. the amplitude of the clock sets the current step amplitude. adjust the clock amplitude and slew rate to set the current step and slew rate. 7. monitor overshoot and un dershoot at corresponding output. a v + _ + vin - load load load a + _ a a v + - v v + - + _ + _ + _ vo1 vo2 vo3 io1 io2 io3 figure 2. proper test set-up figure 3. proper probe set-up to measure output ripple and phase node ringing output cap or mosfet output cap or mosfet output cap or mosfet application note 1482
4 an1482.0 june 30, 2009 . figure 4. load transient circuit for pwm1 opt. load tran. r26 opt m8 opt r27 opt typical evaluation board performance curves v in = 12v, unless otherwise noted. figure 5. pwm1 efficiency vs load (v o = 1.0v) figure 6. pwm2 efficiency vs load (v o = 3.3v) figure 7. pwm3 efficiency vs load (v o = 5.0v) figure 8. pwm1 output ripple under max load (v in = 12v, i o1 = i o2 = 6a, i o3 = 4a, full bandwidth) efficiency (%) load current (a) 40 45 50 55 60 65 70 75 80 85 90 08 v in = 9vdc v in = 12vdc 1234567 v in = 16vdc efficiency (%) 50 55 60 65 70 75 80 85 90 95 100 load current (a) 08 1234567 v in = 16vdc v in = 12vdc v in = 9vdc load current (a) efficiency (%) 50 55 60 65 70 75 80 85 90 95 100 0246 5 3 1 v in = 16vdc v in = 12vdc v in = 9vdc v out1 (ac), 10mv/div 500n s /div application note 1482
5 an1482.0 june 30, 2009 figure 9. pwm2 output ripple under max load (v in = 12v, i o1 = i o2 = 6a, i o3 = 4a, full bandwidth) figure 10. pwm3 output ripple under max load (v in = 12v, i o1 = i o2 = 6a, i o3 = 4a, full bandwidth) figure 11. pwm1 load transient response (load step from 1.5a to 4.5a) figure 12. pwm2 load transient response (load step from 1.5a to 4.5a) figure 13. pwm3 load transient response (load step from 1a to 3a) figure 14. soft start waveforms typical evaluation board performance curves v in = 12v, unless otherwise noted. (continued) v out2 (ac), 50mv/div 500ns/div v out3 (ac), 50mv/div 500ns/div v out1 (ac), 50mv/div i step , 2a/div 50s/div v out2 (ac, 100mv/div) i step , 2a/div 50s/div v out3 (ac), 100mv/div i step , 1a/div 50s/div v out1 , 1v/div v out2 , 2v/div v out4 , 2v/div v out3 , 2v/div 1ms/div application note 1482
6 an1482.0 june 30, 2009 schematic tit le size document number rev date: sheet of b ISL9440CEVAL1Z evaluation board 11 monday , may 11, 2009 ug2 vin cp3 dnp vo2 lg2 r23 dnp c2 22p r21 0 ph1 cb2 0.1u 16v cf f 1 2.2n cin5 10u 25v fb2 rl3 1.2 ph2 cl3 820p vo1 r5 51 en a b le d m6 dnp tp11 int. vcc 1 tp3 pgood 1 q1 q2 m1 irf7907 q1 q2 m3 irf7907 r9 21.5k 1% cp2 dnp c1 0.22u r13 0 co22 dnp 6.3v enabled cp1 3.3n co24 10u 6.3v tp15 vo4 1 co23 dnp 10v co34 dnp 6.3v ldofb enabled m5 dnp r2 102k 1% cfin1 0.47u 35v cin4 10u 25v tp4 rst 1 5v @ 4a cin1 100u 25v disabled tp16 gnd 1 fb3 j4 en3 1 1 2 2 3 3 tp7 vo2 1 tp8 gnd 1 vin r4 dnp r25 dnp ug1 disabled vo3 cin6 10u 25v svin j5 en2 1 1 2 2 3 3 disabled tp10 gnd 1 tp9 vo3 1 lg3 r10 10k 1% ph3 vo3 co11 330u 2.0v sany o, 2r5tpe330m7 co13 10u 6.3v co14 10u 6.3v lg1 roc2 200k co12 dnp 6.3v vo2 cf f 2 100p u1 isl9440c isen1 1 pgood 2 vcc_5v 3 vin 4 en/ss1 5 fb1 6 ocset1 7 rst_n 8 g4 9 ldofb 10 sgnd 11 ocset2 12 fb2 13 en/ss2 14 ocset3 15 fb3 16 en/ss3 17 isen3 18 phase3 19 boot3 20 ugate3 21 lgate3 22 pgnd 23 isen2 24 phase2 25 boot2 26 ugate2 27 lgate2 28 lgate1 29 ugate1 30 boot1 31 phase1 32 33 pad tp19 gnd 1 css1 10n tp1 vin 1 rl1 1.2 cl1 820p tp2 vin- 1 1v @ 6a ldofb vo1 cin3 10u 25v opt. load tran. opt. load tran. opt. load tran. cff3 100p 3.3v @ 5.0a+1.0a tp12 en1 1 r14 0 rl2 1.2 cl2 820p tp5 vo1 1 tp6 1 vin+ cin2 100u 25v cvcc1 4.7u 16v tp17 gnd 1 r19 0 vcc5v css3 10n r3 105k 1% r8 107k 1% c3 1u en3 roc1 100k ug3 css2 10n r26 dnp co41 10u m8 dnp cb1 0.1u 16v r27 dnp roc3 200k tp13 en3 1 tp20 vin 1 r24 dnp m7 dnp vin tp21 gnd 1 vin en1 r17 0 r1 25.5k 1% j3 en1 1 1 2 2 3 3 co32 dnp 6.3v r18 0 co33 10u 6.3v 2.5v @ 1.0a vo2 co31 220u 6.3v sany o , 6tpe220mi tp14 en2 1 vin- rpg1 100k l1 1.0u toko, #919as-1r0n r11 34k 1% m4 si4423dy co42 100u 4.0v 4tpe100mzb r22 dnp cb3 0.1u 16v pgood r7 0 rfin1 10 r15 0 rsen1 1.82k r20 0 co21 220u 6.3v sany o, 6tpe220mi r16 0 rsen3 3.32k l2 1.8u toko, #919as-1r8n r12 0 l3 2.8u toko, #919as-2r8m q1 q2 m2 irf7907 rsen2 3.32k r6 20k 1% application note 1482
7 an1482.0 june 30, 2009 table 2. bill of materials essential components item qty part reference value description part # manufacturer 1 3 cb1, cb2, cb3 0.1f cap ceramic x5r, 16v, smd, 0603, generic 2 1 cfin1 0.47f cap ceramic x5r, 25v, smd, 0603, generic 3 2 cin1, cin2 100f alum. elec. cap 25v panasonic 4 4 cin3, cin4, cin5, cin6 10f cap ceramic x5r, 25v, smd, 1206, generic 5 3 cl1, cl2, cl3 820pf cap ceramic x5r, 16v, smd, 0603, generic 6 1 co11 330f poscap, 2.0v, smd, d2e 2r5tpe330m7 sanyo 7 5 co13, co14, co24, co33, co41 10f cap ceramic x5r, 6.3v, smd, 0805 generic 8 2 co21, co31 220f poscap, 6.3v, smd, d2e 6tpe220mi sanyo 9 1 co42 100f poscap, 4.0v, smd, b 4tpe100mzb sanyo 10 1 cvcc1 4.7f cap ceramic x5r, 16v, smd, 0805, generic 11 1 cff1 2.2nf cap ceramic, smd, 0603, generic 12 2 cff2, cff3 100pf cap ceramic, smd, 0603, generic 13 1 cp1 3.3nf cap ceramic, smd, 0603, generic 14 3 css1, css2, css3 10nf cap ceramic, smd, 0603, generic 15 1 c1 0.22f cap ceramic x5r, 16v, smd, 0603, generic 16 1 c2 22pf cap ceramic, smd, 0603, generic 17 1 c3 1f cap ceramic, 6.3v,smd, 0603, generic 18 1 l1 1.0h shielded inductor #919as-1r0n toko 19 1 l2 1.8h shielded inductor #919as-1r8n toko 20 1 l3 2.8h shielded inductor #919as-2r8m toko 21 3 m1, m2, m3 dual n mosfet, 30v , soic8 irf7907 international rectifier 22 1 m4 p mosfet, soic8 si4423dy vishay 23 1 r fin1 10 resistor, smd, 0805, 10% generic 24 3 rl1, rl2, rl3 1.2 resistor, smd, 0603, 10% generic 25 2 rpg1, roc1 100k resistor, smd, 0603,1% generic 26 2 roc2, roc3 200k resistor, smd, 0603,1% generic 27 1 r sen1 1.82k resistor, smd, 0603,1% generic 28 2 r sen2 , r sen3 3.32k resistor, smd, 0603,1% generic 29 1 r1 25.5k resistor, smd, 0603,1% generic 30 1 r2 102k resistor, smd, 0603,1% generic 31 1 r3 105k resistor, smd, 0603,1% generic 32 1 r5 51 resistor, smd, 0603,1% generic 33 1 r6 20k resistor, smd, 0603,1% generic 34 1 r8 107k resistor, smd, 0603,1% generic 35 1 r9 21.5k resistor, smd, 0603,1% generic 36 1 r10 10k resistor, smd, 0603,1% generic 37 1 r11 34k resistor, smd, 0603,1% generic 38 1 u1 - quad output controller isl9440c intersil application note 1482
8 intersil corporation reserves the right to make changes in circuit design, software and/or specifications at any time without n otice. accordingly, the reader is cautioned to verify that the application note or technical brief is current before proceeding. for information regarding intersil corporation and its products, see www.intersil.com an1482.0 june 30, 2009 optional components or resistor jumpers item qty reference value description part # manufacturer 39 10 r7, r12, r13, r14, r15, r16, r17, r18, r19, r20, r21 0 resistor jumpers, smd, 0603, 10% generic 40 3 co12, co22, co32 dnp 41 2 co23, co34 dnp 42 2 cp2, cp3 dnp 43 1 m5 dnp p mosfet to-252 44 3 m6, m7, m8 dnp n mosfet 45 4 r4, r22, r25, r27 dnp resistor, smd, 0603 46 3 r23, r24, r26 dnp resistor, smd, 1206 evaluation board hardwares item qty reference value description part # manufacturer 47 3 j3, j4, j5 - 3 head jumper 68000-236hlf generic 48 11 tp1, tp2, tp3, tp4, tp6, tp17, tp11, tp12, tp13, tp14, tp7 - test point 5007 keystone 49 9 tp8, tp10, tp16, tp19, tp21, tp9, tp5, tp15, tp20 gnd turret 1514-2 keystone table 2. bill of materials (continued) application note 1482
9 an1482.0 june 30, 2009 ISL9440CEVAL1Z pcb layout figure 15. top components figure 16. top layer application note 1482
10 an1482.0 june 30, 2009 figure 17. second layer (solid ground) figure 18. third layer ISL9440CEVAL1Z pcb layout (continued) application note 1482
11 an1482.0 june 30, 2009 figure 19. bottom layer (mirrored) figure 20. bottom components (mirrored) ISL9440CEVAL1Z pcb layout (continued) application note 1482

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