Application Note 1727 ISL78225EVAL1Z: 4-Phase Interleaved Synchronous Boost Converter ISL78225EVAL1Z Evaluation Board Quick Test Guide The ISL78225EVAL1Z evaluation board features the ISL78225 4-phase interleaved boost controller and four ISL78420 100V MOSFET drivers. The ISL78225 and ISL78420s are configured as a 4-phase synchronous boost converter for 10V to 16V input into 36V output at 10A. The interleaved timing reduces input and output ripple current, thereby reducing the required number of input and output capacitors. The ISL78225 enhances light load efficiency by dropping phases with decreasing load, by emulating a diode while stopping reverse current in the synchronous output switch, and by skipping switch pulses at very light loads. The ISL78420 facilitates diode emulation by translating the midrange of the tri-level PWM out from the ISL78225 to turn both output switches off. 1. Set main power supply to 10V, turn off, and connect to VIN and GND terminals on board. 2. Set electronic load for 1A, turn off, and connect to VOUT and GND terminals on board. 3. Set bias power supply to 10V, turn off, and connect to TP12 (VDR) and TP26 (GND) on board. 4. Turn on the bias power supply. 5. Turn on the main power supply. 6. Turn on the electronic load. 7. Adjust the main power supply in the range of 10V to 16V as desired. 8. Adjust the electronic load in the range of 0A to 10A as desired. 9. Turn off the main power supply. For a 6-phase interleaved boost controller, please see the ISL78220. 10. Turn off the bias power supply. Recommended Equipment The default is phase dropping mode. For continuous switching mode, move shunt from JP14 to JP16 while the main power is turned off. • 0V to 20V main power supply with at least 40A source current capability 11. Turn off the electronic load. • 10V bias power supply with at least 100mA source current capability • 40V electronic load capable of sinking up to 10A • Digital Multimeters (DMMs) • 100MHz Quad-Trace Oscilloscope FIGURE 1. PHOTO OF ISL78225EVAL1Z EVALUATION BOARD November 6, 2013 AN1727.1 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2012, 2013. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. Application Note 1727 +10V DC DC SUPPLY VIN = 10 TO 16V ELECTRONIC LOAD FIGURE 2. ISL78225EVAL1Z CONNECTIONS NOTE: In layout point of view, TP12/TP26 positions are not good to add the driving bias voltage. The input nodes for the driving bias should be placed close to drivers and away from the sensitive lines like current sense signals. The board will be updated later. 2 AN1727.1 November 6, 2013 Application Note 1727 Typical Performance Curves 0.98 0.93 0.88 0.83 0.78 0.73 WITH PHASE DROPPING WITHOUT PHASE DROPPING 0.93 WITHOUT PHASE DROPPING EFFICIENCY (%) EFFICIENCY (%) 0.98 WITH PHASE DROPPING 0.88 0.83 0.78 10V INPUT, 36V OUTPUT SYNCHRONOUS BOOST 0 1 2 3 4 5 6 7 8 9 0.73 10 16V INPUT, 36V OUTPUT SYNCHRONOUS BOOST 0 1 2 3 4 5 6 7 8 9 10 OUTPUT CURRENT (A) FIGURE 3. 10V INPUT EFFICIENCY vs OUTPUT CURRENT vs PHASE DROPPING MODE FIGURE 4. 16V INPUT EFFICIENCY vs OUTPUT CURRENT vs PHASE DROPPING MODE 36.5 36.5 36.4 36.4 36.3 36.3 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT CURRENT (A) 36.2 36.1 36.0 35.9 35.8 35.7 35.6 35.5 36.2 36.1 36.0 35.9 35.8 35.7 35.6 10V INPUT 0 1 2 3 4 5 6 7 8 9 10 35.5 10A OUTPUT 10 11 OUTPUT CURRENT (A) FIGURE 5. OUTPUT VOLTAGE vs OUTPUT CURRENT 12 13 14 15 16 INPUT VOLTAGE (V) FIGURE 6. OUTPUT VOLTAGE vs INPUT VOLTAGE C1 = PHASE 1, 20V/DIV C1 = PHASE 1, 20V/DIV C4 = VOUT (AC-COUPLED), 100mV/DIV C4 = VOUT (AC-COUPLED), 100mV/DIV 10V INPUT, 36V @ 10A OUTPUT 1µs/DIV FIGURE 7. FULL LOAD OUTPUT RIPPLE 3 10V INPUT, 0 TO 10A TO 0 STEP LOAD 2ms/DIV FIGURE 8. FULL STEP LOAD TRANSIENT AN1727.1 November 6, 2013 Schematics 1 IN JP18 2 IN JP17 DNP OPEN OPEN C110 DNP R23 C34 2K R22 R25 J7 1 2 R19 VCC DNP R15 IN J8 IN 1 2 5 E TP10 2 JP16 1 10K R29 10K TP6 ISL78225 U7 R6 IN VIN NC NC ISEN4P ISEN4N ISEN2P ISEN2N NC NC ISEN3P ISEN3N 33 32 31 30 29 28 27 26 25 24 23 IN IN IN IN IN IN IN IN 1 TP27 JP22 R1 0 2 2 JP14 JP20 2 OUT ISEN3P ISEN3N ISEN1P ISEN1N DRIVE_EN OUT PWM4 OUT PWM2 OUT PWM3 OUT PWM1 2 1 JP15 2 2 JP13 E 1 1 2 JP24 1 JP25 1 JP19 1 OPEN TP1 E R103 DNP VL TP23 TP24 TP26 TP28 1 ISEN4P ISEN4N ISEN2P ISEN2N DRIVE_EN 0 CLK_OUT 2 DNP C1 GND R102 1UF C10 OUT VIN1 E VCC VDR IN 1UF IN TP12 VCC MODE C109 44 43 42 41 40 39 38 37 36 35 34 VCC TP4 E 10K EP E CLK_OUT 4 3 VIN1 6.81K SYNC 4 3 5 FS SS COMP FB VREF2 GND SLOPE PLL_COMP SYNC CLK_OUT PWM_INV 45 1000PF C15 R18 E VIN_VO TP9 2 JP9 1 27.4K PLL_COMP C106 TP22 6800PF SS 1 2 3 4 5 6 7 8 9 10 11 R16 VREF R27 2K R30 TP2 0.022UF PGOOD EN DMAX VOUT_OVB VOUT_SEN VIN_OVB VIN_SEN IOUT MODE GND VCC R14 51.1K 0.047UF E TP21 E VOUT_OV 10K 158K C13 PWM_TRI PWM1 PWM3 P_COM PWM2 PWM4 NC DRIVE_EN NC ISEN1N ISEN1P 1000PF 4.7UF VCC 12 13 14 15 16 17 18 19 20 21 22 2 DNP OPEN R24 34K C14 TP25 R28 R12 C104 IOUT OUT C16 249K E TP3 TP7 E 0.01UF VOUT_SENSE VIN_SENSE Application Note 1727 C35 PGOOD COMP E IN R21 1 3.32K TP8 1 VOUT1 DNP 2 3 4 4 9.09K C36 EN R20 IN Q1 TP5 TP11 VIN1 2N7002 FB R89 RED R87 R88 1 IN R26 E 3 GRN LED2 SSL_LXA3025IGC 3.32K 2 VCC E AN1727.1 November 6, 2013 FIGURE 9. ISL78225EVAL1Z SCHEMATIC PAGE 1 DRAWN BY: RELEASED BY: UPDATED BY: TIM KLEMANN DATE: 06/19 DATE: DATE: TEST Schematics (Continued) 7 5 HS RDT 6 EP ISL78420ARTBZ E E 1 220UF C56 2 1 C55 220UF 63V C39 4.7UF 2 5 6 7 8 0 1 2 3 R33 E TP13 PWM1 IN 0 R36 IN 2.2 DNP 8 EN DNP Q6 R105 20K PWM HO 3 V12P10 E R37 PHASE 1 HB 4 D1 AON6242 9 3 11 4 VOUT C38 OPEN DNP 0 R32 10 LO VSS C37 ISEN1N C19 R91 49.9 R3 R104 VDD Q3 AON6246 2 E R8 3.01K DRIVE_EN VOUT E OUT E HB 4 HO 5 HS 8 EN 7 RDT 6 5 6 7 8 AON6242 E Q8 1 2 3 TP15 E R38 2.2 ISL78420ARTBZ FIGURE 10. ISL78225EVAL1Z SCHEMATIC PAGE 2 E E R107 IN 0 DRIVE_EN PWM2 IN 220UF 1 C62 2 1 2 DNP C61 V12P10 C45 C44 D2 3 0 R40 4 VOUT 220UF 63V 5 6 7 8 0.1UF 4 10 2 9 PWM EP E 20K 4.7UF 3 C46 ISEN2N LO VSS 11 PHASE 2 VDD R7 100 1 IN VDR OUT OUT ISEN2P E R44 U2 1 DNP 4.7 DNP DNP 39PF 0.22UF R45 R41 R42 C22 49.9 C20 C21 OPEN PHASE2 2 6.8UH Q9 AON6246 1 2 3 0 L2 1 R106 2 R92 49.9 R2 10UF C42 C43 1UF 1 220UF C59 R93 0.001 2 220UF 63V 2 C60 1 1 0 TP16 TO NEXT SHEET 4.7UF R46 E R39 1UF 1 IN VDR E OUT 4.7 U1 VIN TO NEXT SHEET R35 5 6 7 8 1 1 2 3 Application Note 1727 R79 DNP 100 R43 ISEN1P 20K R82 OUT VIN1 OUT C18 0.22UF R31 OUT OUT 0 C107 49.9 10UF 1UF C40 C58 R84 0 PHASE1 2 6.8UH C17 2 C41 1 220UF 1 E LAYOUT C107 AS CLOSE TO PIN 38 OF U1 L1 1 39PF E VIN_SENSE 2 0.001 220UF 63V 2 C57 1 2 C94 220UF 1 C93 2 2 5 J2 220UF 63V C92 1 GND 1 R90 1 4.7UF J6 220UF 1 4 R34 TP14 0.1UF VIN AN1727.1 November 6, 2013 Schematics (Continued) LO E 3 HB PWM HO EN 7 5 HS RDT 6 E EP 1 R85 C66 220UF 63V 51.1K 2 2 1 C65 220UF C50 4.7UF Q17 AON6246 DNP 1 2 3 E TP19 R55 2.2 R110 0 IN PWM4 IN DRIVE_EN ISL78420ARTBZ E E FIGURE 11. ISL78225EVAL1Z SCHEMATIC PAGE 3 1 OUT 220UF 63V C70 2 C69 2 V12P10 Q16 220UF C71 1 VOUT 4.7UF C54 D4 3 0.1UF 4 5 6 7 8 AON6242 E 8 4 11 0 10 9 R10 C72 VSS 4.7UF OUT OUT ISEN4N VDD 4 5 6 7 8 DNP 1 IN E 2 R57 U4 1 R56 0 DNP 4.7 OPEN 0.22UF 20K R59 R61 39PF 1 2 3 C128 R58 DNP C27 VDR ISEN4P C125 3.01K R86 0.1UF 100V 1 0.1UF C115 VOUT IN FROM PREVIOUS SHEET GND E 0 R111 R96 C26 PHASE 4 VOUT DRIVE_EN J5 J9 PHASE4 2 6.8UH 100 R60 L4 1 49.9 49.9 R5 10UF C75 1UF C76 1 2 220UF C73 1 C74 2 220UF 63V 2 0.001 E VOUT E IN 1 TP20 R97 0.1UF DNP OPEN C49 IN 2.2 R62 1 C108 0 1 2 3 0 R47 7 E ** PWM3 C112 EP R109 0.1UF RDT E TP17 6 VOUT_SENSE OUT Q12 E ISL78420ARTBZ E DNP AON6242 C105 EN 4 OUT 0 0.1UF PWM HO 11 V12P10 5 6 7 8 HB 8 HS 2 3 VOUT1 R80 DNP 5 E 10 9 R9 C51 E 4 D3 5 6 7 8 E Application Note 1727 PHASE 3 4.7UF 3 LO VSS 20K ISEN3N ISEN3P FROM PREVIOUS SHEET VDD VDR OUT IN 1 IN OUT VIN 0.22UF 4.7 U3 100 R52 6 E R51 R49 DNP 39PF C24 R50 R48 R94 49.9 R4 49.9 10UF 1UF C47 C48 C63 C23 1 ** LAYOUT C108 AS CLOSE TO PIN 40 OF U1 Q13 AON6246 4 1 2 3 PHASE3 0 6.8UH 2 1 220UF 2 2 220UF 63V C64 1 0.001 TP18 L3 R53 1 C25 2 R108 R95 1 0 1000PF R54 AN1727.1 November 6, 2013 Application Note 1727 TABLE 1. BILL OF MATERIALS ITEM QTY PART REFERENCE 1 1 C107 C1608X7R1C105K CAP, SMD, 0603, 1.0µF, 16V, 10%, X7R,ROHS TDK 2 4 C37, C46, C51, C72 C2012X7R1E475K125AB CAP, SMD, 0805, 4.7µF, 25V, 10%, X7R, ROHS TDK 3 4 C41, C42, C47, C75 C5750X7R1H106K CAP, SMD, 2220, 10µF, 50V, 10%, X7R, ROHS TDK 4 4 C39, C45, C50, C71 C5750X7R2A475K CAP, SMD, 2220, 4.7µF, 100V, 10%, X7R, ROHS TDK 5 1 C16 GRM21BR71C475KA73L CAP, SMD, 0805, 4.7µF, 16V, 10%, X7R, ROHS MURATA 6 6 C10, C40, C43, C48, C76, C109 GRM21BR71H105KA12L CAP, SMD, 0805, 1.0µF, 50V, 10%, X7R, ROHS MURATA 7 3 C104, C106, C108 06035C102KAT2A CAP, SMD, 0603, 1000pF, 50V, 10%, X7R, ROHS AVX 8 1 C36 C0603X7R160-103KNE CAP, SMD, 0603, 0.01µF, 16V, 10%, X7R, ROHS 9 1 C13 C0603X7R500-223KNE CAP, SMD, 0603, 0.022µF, 50V, 10%, X7R, ROHS VENKEL 10 4 C18, C21, C24, C27 GCM188R71H224KA64D CAP, SMD, 0603, 0.22µF, 50V, 10%, X7R, ROHS MURATA 11 4 C17, C20, C23, C26 ECJ-1VC1H330J CAP, SMD, 0603, 39pF, 50V, 5%, NP0, ROHS 12 1 C14 GRM188R71E473KA01D CAP, SMD, 0603, 0.047µF, 25V, 10%, X7R, ROHS MURATA 13 1 C15 06035C682KAT9A CAP, SMD, 0603, 6800PF, 50V, 10%, X7R, ROHS AVX 14 0 C19, C22, C25, C34, C35, C110, C128 15 8 C38, C44, C49, C54, C105, C112, C125, C115 16 0 C1 CAP, SMD, 0805, DNP-PLACE HOLDER, ROHS 17 19 C55-C66, C69, C70, C73, C74, EKZE630ELL221MJ25S C92-C94. CAP, RADIAL, 10x25, 220µF, 63V, 20%, ALUM.ELEC., 5mm, ROHS UNITED CHEMI-CON 18 4 L1-L4 IHLP6767GZER6R8M11 COIL-PWR INDUCTOR, SMD, 17.15mm, 6.8µH, 20%, 22.5A, ROHS VISHAY 19 2 J7, J8 31-5329-52RFX CONN-BNC, RECEPTACLE, TH, 4 POST, 50Ω, GOLDCONTACT, ROHS AMPHENOL 20 28 TP1-TP28 5002 CONN-MINI TEST POINT, VERTICAL, WHITE,ROHS KEYSTONE 21 12 JP9, JP13-JP20, JP22, JP24, JP25 69190-202HLF CONN-HEADER, 1x2, RETENTIVE, 2.54mm, 0.230x 0.120, ROHS 22 3 JP13, JP14, JP17 SPC02SYAN CONN-JUMPER, SHORTING, 2PIN, BLACK, GOLD, SULLINS ROHS 23 1 LED2 SSL-LXA3025IGC-TR LED, SMD, 3x2.5mm, 4P, RED/GREEN, 12/20MCD, 2V LUMEX 24 1 U7 ISL78225ANEZ IC-4 PHASE PWM CONTROLLER, 44P, EP-TQFP, 10X10, ROHS INTERSIL 25 4 U1-U4 ISL78420ARTBZ IC-2A,100V, HALF-BRIDGE DRIVER, 9P, TDFN, 4x4, ROHS INTERSIL 26 1 Q1 2N7002LT1G TRANSISTOR-MOS, N-CHANNEL, SMD, SOT23, 60V, 115mA, ROHS ON SEMICONDUCTOR 27 4 Q6, Q8, Q12, Q16 AON6242 TRANSISTOR-MOS, N-CHANNEL, 60V, 85A, 8P, DFN, 5X6, ROHS ALPHA & OMEGA SEMICONDUCTOR 28 4 Q3, Q9, Q13, Q17 AON6246 TRANSISTOR-MOS, N-CHANNEL, 60V, 80A, 8P, DFN, 5x6, ROHS ALPHA & OMEGA SEMICONDUCTOR 29 4 R36, R38, R47, R55 ERJ-3RQF2R2V RES, SMD, 0603, 2.2Ω, 1/10W, 1%, TF, ROHS PANASONIC 30 4 R35, R42, R51, R59 CR0603-10W-4R70FT RES, SMD, 0603, 4.7Ω, 1/10W, 1%, TF, ROHS VENKEL 7 PART NUMBER DESCRIPTION MANUFACTURER VENKEL PANASONIC CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS C2012X7R2A104K CAP, SMD, 0805, 0.1µF, 100V, 10%, X7R, ROHS TDK BERG/FCI AN1727.1 November 6, 2013 Application Note 1727 TABLE 1. BILL OF MATERIALS ITEM QTY PART REFERENCE 31 20 R1, R6, R33, R34, R40, R46, CR0603-10W-000T R49, R54, R57, 62, R80, R84, R104-R111. RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS VENKEL 32 4 R43, R44, R52, R60 CR0603-10W-1000FT RES, SMD, 0603, 100Ω, 1/10W, 1%, TF, ROHS VENKEL 33 4 R15, R27, R29, R89 RK73H1JT1002F RES, SMD, 0603, 10K, 1/10W, 1%, TF, ROHS KOA 34 1 R12 CR0603-10W-1583FT RES, SMD, 0603, 158K, 1/10W, 1%, TF, ROHS VENKEL 35 1 R22 RK73H1JTTD2001F RES, SMD, 0603, 2K, 1/10W, 1%, TF, ROHS KOA 36 6 R7, R8, R9, R10, R20, R82 CR0603-10W-2002FT RES, SMD, 0603, 20K, 1/10W, 1%, TF, ROHS VENKEL 37 1 R28 9C06031A2493FKHFT RES, SMD, 0603, 249K, 1/10W, 1%, TF, ROHS YAGEO 38 1 R16 ERJ-3EKF2742V RES, SMD, 0603, 27.4K, 1/10W, 1%, TF, ROHS PANASONIC 39 2 R79, R86 MCR03EZPFX3011 RES, SMD, 0603, 3.01K, 1/10W, 1%, TF, ROHS ROHM 40 2 R87, R88 RC0603FR-073K32L RES, SMD, 0603, 3.32K, 1/10W, 1%, TF, ROHS YAGEO 41 1 R21 CR0603-10W-3402FT RES, SMD, 0603, 34K, 1/10W, 1%, TF, ROHS VENKEL 42 1 R30 ERJ-3EKF4991V RES, SMD, 0603, 4.99K, 1/10W, 1%, TF, ROHS PANASONIC 43 8 R2-R5, R91, R92, R94, R96. CR0603-10W-49R9FT RES, SMD, 0603, 49.9Ω, 1/10W, 1%, TF, ROHS VENKEL 44 2 R14, R85 CR0603-10W-5112FT RES, SMD, 0603, 51.1K, 1/10W, 1%, TF, ROHS VENKEL 45 1 R18 RC0603FR-076K81L RES, SMD, 0603, 6.81K, 1/10W, 1%, TF, ROHS YAGEO 46 1 R26 RC0603FR-079K09L RES, SMD, 0603, 9.09K, 1/10W, 1%, TF, ROHS YAGEO 47 0 R19, R23-R25, R31, R32, R37, R39, R41, R45, R48, R50, R53, R56, R58, R61, R102, R103. 48 4 R90, R93, R95, R97 WSL25121L000FEA RES-CURR. SENSE, SMD, 2512, 0.001Ω, 1W, 1%, VISHAY/DALE ROHS 49 4 J2, J5, J6, J9 KPA8CTP HDWARE, MTG, CABLE TERMINAL, 6-14AWG, LUG&SCREW, ROHS 50 0 D1-D4 (V12P10-M3/86A) 8 PART NUMBER DESCRIPTION MANUFACTURER RES, SMD, 0603, DNP-PLACE HOLDER,ROHS BERG/FCI DO NOT POPULATE OR PURCHASE AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout FIGURE 12. ASSEMBLY TOP 9 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 13. SILK SCREEN TOP 10 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 14. TOP LAYER COMPONENT SIDE 11 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 15. LAYER 2 12 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 16. LAYER 3 13 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 17. LAYER 4 14 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 18. LAYER 5 15 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 19. BOTTOM LAYER SOLDER SIDE 16 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 20. SILK SCREEN BOTTOM 17 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 21. SILK SCREEN BOTTOM (MIRRORED) 18 AN1727.1 November 6, 2013 Application Note 1727 ISL78225EVAL1Z Board Layout (Continued) FIGURE 22. ASSEMBLY BOTTOM Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. 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 19 AN1727.1 November 6, 2013