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Using the ISL6402, ISL6402A Evaluation Board
Application Note May 2004 AN1130
Using the Evaluation Board
The ISL6402 and ISL6402A are high performance tripleoutput controllers offering control and protection features for 2 synchronous buck PWMs and 1 linear regulator. The ISL6402, ISL6402A evaluation boards highlight the operation of the IC in embedded DC-DC converter applications. Table 1 shows the available evaluation boards.
TABLE 1. EVALUATION BOARDS BOARD NAME ISL6402EVAL4 ISL6402AEVAL4 IC ISL6402IR ISL6402AIR PACKAGE 28 Ld QFN 28 Ld QFN
To independently shutdown the PWMs, the SD1 or SD2 pin can be pulled to GND using the on board jumpers, JP2 and JP3 respectively.
SYNC Function
The ISL6402, ISL6402A can synchronize to another ISL6402, ISL6402A. The SYNC pin sends out pulses at 4 times the switching frequency for the ISL6402A and 16 times the switching frequency of the ISL6402. The SYNC function is bidirectional so if two or more ICs are SYNC, only 1 will be the master. All other ICs will SYNC to the master. The SYNC feature can be evaluated on the eval board. The SYNC pin us pulled to VCC_5V through R17. This resistor should be removed an a 1K resistor should be placed at R19. With the 1K resistor from SYNC to ground, the SYNC pulses can be observed on a scope.
Recommended Test Equipment
* * * * A 4.5V-24V, 5A capable power supply An electronic load Four channel oscilloscope with probes Precision digital multimeters
Power Good
When both PWMs are within 10% of their set value and the linear regulator output is within 75% of its set value, the PGOOD signal will go high. The open drain PGOOD pin is pulled HIGH to VCC_5V on the board. The PGOOD circuitry monitors the FBx pin of each regulated output to determine if the outputs are in regulation. If the linear controller is not used, the VOUT3 post P15 can be tied to VCC_5V so that the PGOOD function can be evaluated without the linear output. PGOOD can be monitored at post P8.
Power and Load Connections
Input Voltage - The input power supply can be connected in two different ways depending on the input voltage supplied to the PWM power stage. When connecting to a 5.6V-20V power supply, connect the positive lead of the power supply to VIN (P1) post and the ground lead of the supply to the GND (P2) post. When connecting to a 4.5V-5.5V input, the Vin (P1) and VCC_5V (P10) posts must be shorted using the jumper (JP1) before connecting the positive lead of the supply to the Vin (P1) post and the ground lead to the GND (P2) post. The input voltage to the linear regulator can be supplied from a 3.3V/5V power supply by connecting the positive lead of the power supply to the VIN3 (P13) post and the ground terminal to the GND (P14) post.
Overcurrent Protection
The overcurrent thresholds can be adjusted on the ISL6402, ISL6402A evaluation board. The current sense resistors, ISENSE, are set at 1.4K. The overcurrent set resistor is 120K. The overcurrent trip point can be adjusted by modifying ROCSET, R11 and R12:
Output Adjustment
Change the respective output voltage feedback resistors to modify the output voltage:
R 7 V OUT1 = 0.8 1 + ------ R 8 R 15 V OUT3 = 0.8 1 + --------- R 16 R9 V OUT2 = 0.8 1 + --------- R 10
7 R CS R OCSET = ------------------------------------I OC R DS ( on )
Soft Start and Shutdown
The soft start capacitors can be adjusted for sequencing of the output voltages, PWM startup tracking, and/or to adjust the startup current required to charge the output capacitors.
0.8V t SS ( PWM1 ) = C 6 -----------5A 0.8V t SS ( PWM2 ) = C 5 -----------5A
ROCSET is the overcurrent set resistor, RCS is the current sense resistor, IOC is the desired overcurrent trip point, and rDS(ON) is the on resistance of the respective PWM's lower MOSFET. Refer to the ISL6402, ISL6402A datasheets for more information on how to select the current sense and overcurrent select resistors.
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2004. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL6402AEVAL4 Schematic
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Application Note 1130
Application Note 1130 ISL6402AEVAL4 Bill of Materials
ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 REFERENCE U1 D1, D2 Q1, Q2 Q3 L1, L2 L3 C1, C3 C2 C4, C24, C28 C9, C10, C13, C14 C11A, C12A C11B, C11C, C12B, C12C (DNP) C15, C16 (DNP) C5, C6, C7, C8, C17, C18, C20 C19 C21 C22 C23 R1, R2, R17, R18 R3, R4 R5, R6 (DNP) R7 R8 R9 R10 R11, R12 R13 R14 R15 R16 R19 (DNP) Misc. 32 33 34 35 36 P1 - P16 JP1, JP2, JP3 JP1 (DNP) JP2 - JP3 SP1, SP2 16 3 0 2 2 1514-2 68000-236-1X2 S9001-ND S9001-ND 129-0701-202 Turrett Post Header Jumper Jumper Terminal, Scope Probe Terminal post, through hole, 1/4 inch tall 1X2 Break Strip GOLD 2 pin jumper 2 pin jumper Terminal, Scope Probe PTH 1X2@.1" Digikey Digikey Johnson QTY 1 2 2 1 2 1 2 1 3 4 2 4 2 7 1 1 1 1 4 2 0 1 1 1 1 2 1 1 1 1 1 PART NUMBER ISL6402AIR BAT54WT1 FDS6990S IRF7404 ETQP6F3R2HFA PART TYPE IC, Linear Diode, Schottky MOSFET, Dual MOSFET, Power, HEXFET Power Choke Coil DESCRIPTION PKG. VENDOR Intersil On Semi Fairchild IR PANASONIC Murata Taiyo Yuden/Generic AVX/Generic AVX/Generic AVX/Generic Dual PWM Controller, 1.4MHz 28 QFN 30V, 200mA N-Chan, 30V, 7.5A, 0.022 P-Chan, 20V, 6.7A, 0.04 3.2H, 25%, 8.6A SOT-323 SOIC-8 SOIC-8 PCC-N6 SM_0805 SM_1210 SM_1210 SM_1206 SM_0805
BLM21PG300SN1 Ferrite Bead TMK325BJ106KM Capacitor, Ceramic, X5R 10F, 10%, 25V 12103D475KAT2A Capacitor, Ceramic, XR5 4.7F, 10%, 25V 12063C105KAT2A Capacitor, Ceramic, X7R 1.0F, 10%, 25V 0805ZC105KAT2A Capacitor, Ceramic, X7R 1.0F, 10%, 10V 10TPB150ML Capacitor, Tantalum Capacitor, Tantalum Capacitor, Ceramic 08053C104KAT2A Capacitor, Ceramic, X7R 0.1F, 10%, 25V 16TPB47M 25SP56M Capacitor, Tantalum Capacitor, Aluminum 47F, 20%, 16V 56F, 20%, 25V 150F, 20%, 10V
CASE-D3L SANYO CASE-D3L SANYO SM_0805 SM_0805 CASE-D3 Radial SM_0603 SM_1210 SM_0603 SM_0603 SM_0805 SM_0603 SM_0603 SM_0603 SM_0603 SM_0603 SM_0805 SM_0603 SM_0603 SM_0603 SM_0603 AVX/Generic AVX/Generic SANYO SANYO AVX/Generic AVX/Generic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic
0603YC104KAT2A Capacitor, Ceramic, X7R 0.1F, 10%, 16V 1210ZC106MAT2A Capacitor, Ceramic, X7R 10F, 20%, 10V Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film 100k, 1%, .1W 1.4k, 1%, .1W TBD 23.7k, 1%, 1/16W 7.50k, 1%, 1/16W 4.02k, 1%, 1/16W 8.06k, 1%, 1/16W 120k, 1%, 1/16W 100, 1%, .1W 2.7, 5%, 1/16W 17.4k, 1%, 1/16W 8.25k, 1%, 1/16W
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Application Note 1130 ISL6402AEVAL4 Layout
TOP SILK
LAYER 1
LAYER 2
LAYER 3
LAYER 4
BOTTOM SILK
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ISL6402EVAL4 Schematic
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Application Note 1130
Application Note 1130 ISL6402EVAL4 Bill of Materials
ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 REFERENCE U1 D1, D2 Q1, Q2 Q3 L1, L2 L3 C1, C3 C2 C4, C24, C28 C9, C10, C13, C14 C11A, C11B, C12A, C12B C11C, C12C (DNP) C15, C16 (DNP) C5, C6, C7, C8, C17, C18, C20 C19 C21 C22 C23 R1, R2, R17, R18 R3, R4 R5, R6 (DNP) R7 R8 R9 R10 R11, R12 R13 R14 R15 R16 R19 (DNP) Misc. 32 33 34 35 P1 - P16 JP1, JP2, JP3 JP1 (DNP) JP2 - JP3 16 3 0 2 1514-2 68000-236-1X2 S9001-ND S9001-ND Turrett Post Header Jumper Jumper Terminal post,through hole, 1/4 inch tall 1X2 Break Strip GOLD 2 pin jumper 2 pin jumper PTH 1X2@.1" Digikey Digikey QTY 1 2 2 1 2 1 2 1 3 4 4 2 2 7 1 1 1 1 4 2 0 1 1 1 1 2 1 1 1 1 1 PART NUMBER ISL6402IR BAT54WT1 FDS6990S IRF7404 ETQP6F6R4HFA PART TYPE IC, Linear Diode, Schottky MOSFET, Dual DESCRIPTION PKG. VENDOR Intersil Dual PWM Controller, 300kHz 28 QFN 30V, 200mA N-Chan, 30V, 7.5A, 0.022
SOT-323 On Semi SOIC-8 SOIC-8 PCC-N6 Fairchild IR PANASONIC
MOSFET, Power, HEXFET P-Chan, 20V, 6.7A, 0.04 Power Choke Coil 6.4H, 30%, 6.2A
BLM21PG300SN1 Ferrite Bead TMK325BJ106KM Capacitor, Ceramic, X5R 12103D475KAT2A Capacitor, Ceramic, XR5 12063C105KAT2A Capacitor, Ceramic, X7R 0805ZC105KAT2A Capacitor, Ceramic, X7R 10TPB220M Capacitor, Tantalum Capacitor, Tantalum Capacitor, Ceramic 08053C104KAT2A Capacitor, Ceramic, X7R 16TPB47M 25SP56M Capacitor, Tantalum Capacitor, Aluminum 0.1F, 10%, 25V 47F, 20%, 16V 56F, 20%, 25V 0.1F, 10%, 16V 10F, 20%, 10V 100k, 1%, 0.1W 1.4k, 1%, 0.1W TBD 23.7k, 1%, 1/16W 7.50k, 1%, 1/16W 4.02k, 1%, 1/16W 8.06k, 1%, 1/16W 120k, 1%, 1/16W 100, 1%, 0.1W 2.7, 5%, 1/16W 17.4k, 1%, 1/16W 8.25k, 1%, 1/16W 10F, 10%, 25V 4.7F, 10%, 25V 1.0F, 10%, 25V 1.0F, 10%, 10V 220F, 20%, 10V
SM_0805 Murata SM_1210 Taiyo Yuden/Generic SM_1210 AVX/Generic SM_1206 AVX/Generic SM_0805 AVX/Generic CASE-D4 SANYO CASE-D4 SANYO SM_0805 AVX/Generic SM_0805 AVX/Generic CASE-D3 SANYO Radial SANYO
0603YC104KAT2A Capacitor, Ceramic, X7R 1210ZC106MAT2A Capacitor, Ceramic, X7R Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film Resistor, Film
SM_0603 AVX/Generic SM_1210 AVX/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic SM_0805 Panasonic/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic SM_0805 Panasonic/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic SM_0603 Panasonic/Generic
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 6
Application Note 1130 ISL6402EVAL4 Layout
TOP SILK
LAYER 1
LAYER 2
LAYER 3
LAYER 4
BOTTOM SILK
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