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1 caution: these devices are sensitive to electrostatic 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. 2010. all rights reserved all other trademarks mentioned are the property of their respective owners. application note 1551 isl9440aeval1z: triple pwm step-down synchronous buck controller and one ldo isl9440aeval1z evaluation board the isl9440aeval1z evaluati on board features the isl9440a. the isl9440a is a a quad-output controller that integrates three pwm synchronous buck controllers and one low-dropout linear regulator controller. the isl9440a offers internal soft -start, independent enable functions and integrates uv/ov/oc/ot protection. its current mode control architecture and internal compensation network keep peripheral component count minimal. switching frequency of 600khz minimizes inductor size while the strong gate drivers deliver up to 12a to each pwm channel. table 1 shows the difference in terms of isl944xx family features. the isl9440aeval1z is easy to set up to evaluate the performance of the isl9440a. please refer to the ?electrical specifications? table on page 2 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. isl9440aeval1z evaluation board march 5, 2010 an1551.0
2 an1551.0 march 5, 2010 what?s inside the evaluation board kit contains the following materials: ? the isl9440aeval1z ? the isl9440, isl9440a, isl9441 datasheet fn6383 ? this evaluation board kit document (an1551) 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 capa ble 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 correctly connected to the supply and electronic loads prior to applying any power. please refer to figure 2 for proper set-up. 2. connect jumpers j 3 , j 4 and j 5 in the enx positions. 3. turn on the power supply. 4. adjust input voltage v in within the specified range and observe output voltage. the output voltage variation should be within 3%. 5. adjust load current with in 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 the ?schematic? on page 7 and ?typical evaluation board performance curves? on page 4. 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 r 7 = 0 , r 4 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 wi th full bandwidth 19.4 mv p-p v out 2 peak-to-peak ripple 36.6 mv p-p v out 3 peak-to-peak ripple 32.2 mv p-p application note 1551
3 an1551.0 march 5, 2010 load transient circuit set-up 1. select a soic8 n-channel mosfet with vds breakdown >20v. 2. install the load transient circuit as indicated on the schematic. refer to figure 4 for detail. 3. r 27 , r 22 and r 25 are 10k resistors for discharging the mosfet gates. 4. r 26 , r 23 and r 24 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 resistors sets the current scale on the oscilloscope. 5. apply pulse square waveform across r 27 , r 22 or r 25 . the duty cycle of the pulse waveform should be small (<5%) to limit thermal stress on current sensing resistor and the mosfets (m 8 , m 6 or m 7 ). 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 undershoot at corresponding output. 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 1551
4 an1551.0 march 5, 2010 . figure 4. load transient circuit for pwm1 opt. load tran. r 26 opt m 8 opt r 27 opt typical evaluation bo ard 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 regulation curves (pwm2, pwm3 disabled) 40 45 50 55 60 65 70 75 80 85 90 06 load current (a) efficiency (%) v in = 12v v in = 16v v in = 9v 2345 178 50 55 60 65 70 75 80 85 90 95 100 123 6 load current (a) efficiency (%) v in = 12v v in = 16v v in = 9v 45 7 0 50 55 60 65 70 75 80 85 90 95 100 0 2345 load current (a) efficiency (%) v in = 12v v in = 16v v in = 9v 1 0.990 0.995 1.000 1.005 1.010 0 load current (a) output voltage v in = 12v v in = 9v 2468 v in = 16v application note 1551
5 an1551.0 march 5, 2010 figure 9. pwm2 regulation curves (pwm1, pwm3 disabled) figure 10. pwm3 regulation curves (pwm1, pwm2 disabled) figure 11. soft-start curves figure 12 . pwm1 output ripple under max load (v in = 12v, i o1 = i o2 = 6a, i o3 = 4a, full bandwidth) figure 13. pwm2 output ripple under max load (v in = 12v, i o1 = i o2 = 6a, i o3 = 4a, full bandwidth) figure 14. pwm3 output ripple under max load (v in = 12v, i o1 = i o2 = 6a, i o3 = 4a, full bandwidth) typical evaluation bo ard performance curves v in = 12v, unless otherwise noted. (continued) 3.290 3.295 3.300 3.305 3.310 load current output voltage v in = 12v v in = 9v v in = 16v 02468 4.970 4.975 4.980 4.985 4.990 4.995 5.000 01 5 load current output voltage v in = 12v v in = 9v v in = 16v 234 v out2 , 2v/div v out4 , 2v/div v out3 , 2v/div 200s/div v out1 , 500mv/div v out1 (ac), 10mv/div v out2 (ac), 20mv/div 500ns/div v out3 (ac), 20mv/div 500ns/div application note 1551
6 an1551.0 march 5, 2010 figure 15. pwm1 load transient response (load step from 1.5a to 4.5a) figure 16. pwm2 load transient response (load step from 1.5a to 4.5a) figure 17. pwm3 load transient response (load step from 1a to 3a) typical evaluation bo ard performance curves v in = 12v, unless otherwise noted. (continued) 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 application note 1551
7 an1551.0 march 5, 2010 schematic application note 1551
8 an1551.0 march 5, 2010 table 2. bill of materials essential components item qty part reference value description part # manufacturer 1 3 cb1, cb2, cb3 0.1f cap cerami c x5r, 16v, smd, 0603 generic 2 1 cfin1 0.47f cap ceramic x5 r, 25v, smd, 0603 generic 3 2 cin1, cin2 100f alum. elec. cap 35v eeu-fc1v101 panasonic 4 4 cin3, cin4, cin5, cin6 10f cap ceramic x5r, 35v, smd, 1206 generic 5 3 cl1, cl2, cl3 820pf cap ceramic x5r, 50v, smd, 0603 generic 6 1 co11 330f poscap, 2.5v, 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, 6.3v, 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 1 c1 0.22f cap ceramic x5r, 16v, smd, 0603 generic 15 1 c2 22pf cap ceramic x5r, 16v, smd, 0603 generic 16 1 c3 1f cap ceramic x5r, 16v, smd, 0603 generic 17 1 l1 1.0h shielded in ductor #919as-1r0n toko 18 1 l2 1.8h shielded in ductor #919as-1r8n toko 19 1 l3 2.8h shielded in ductor #919as-2r8m toko 20 3 m1, m2, m3 dual n mosfet, 30v, soic8 irf7907 international rectifier 21 1 m4 p mosfet, soic8 si4423dy vishay 22 1 r fin1 10 resistor, smd, 0805, 10% generic 23 3 rl1, rl2, rl3 1.2 resistor, smd, 0603, 10% generic 24 2 rpg1, roc1 100k resistor, smd, 0603, 1% generic 25 2 roc2, roc3 200k resistor, smd, 0603, 1% generic 26 1 r sen1 1.82k resistor, smd, 0603, 1% generic 27 2 r sen2 , r sen3 3.32k resistor, smd, 0603, 1% generic 28 1 r1 25.5k resistor, smd, 0603, 1% generic 29 1 r2 102k resistor, smd, 0603, 1% generic 30 1 r3 105k resistor, smd, 0603, 1% generic 31 1 r5 51 resistor, smd, 0603, 1% generic 32 1 r6 20k resistor, smd, 0603, 1% generic 33 1 r8 107k resistor, smd, 0603, 1% generic 34 1 r9 21.5k resistor, smd, 0603, 1% generic 35 1 r10 10k resistor, smd, 0603, 1% generic application note 1551
9 intersil corporation reserves the right to make changes in circui t 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 an1551.0 march 5, 2010 36 1 r11 34k resistor, smd, 0603, 1% generic 37 1 u1 quad output controller isl9440airz intersil optional components or resistor jumpers item qty reference value descr iption part # manufacturer 38 10 r7, r12, r13, r14, r15, r16, r17, r18, r19, r20, r21 0 resistor jumpers, smd, 0603, 10% generic 39 3 co12, co22, co32 dnp 40 2 co23, co34 dnp 41 2 cp2, cp3 dnp 42 1 m5 dnp p mosfet to-252 43 3 m6, m7, m8 dnp n mosfet 44 4 r4, r22, r25, r27 dnp resistor, smd, 0603 45 3 r23, r24, r26 dnp resistor, smd, 1206 evaluation board hardware item qty reference value description part # manufacturer 46 3 j3, j4, j5 3 head jumper 68000-236hlf generic 47 11 tp1, tp2, tp3, tp4, tp6, tp17, tp11, tp12, tp13, tp14, tp7 test point 5007 keystone 48 9 tp8, tp10, tp16, tp19, tp21, tp9, tp5, tp15, tp20 gnd turret 1514-2 keystone table 2. bill of materials (continued) essential components item qty part reference value description part # manufacturer application note 1551
10 an1551.0 march 5, 2010 isl9440ceval1z pcb layout figure 18. top layer figure 19. second layer (solid ground) application note 1551
11 an1551.0 march 5, 2010 figure 20. third layer figure 21. bottom layer (mirrored) isl9440ceval1z pcb layout (continued) application note 1551

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