ISL6402AEVAL4

ISL6402AEVAL4 Datasheet

Using the ISL6402, ISL6402A Evaluation Board

Part	Datasheet
ISL6402AEVAL4	ISL6402AEVAL4 (pdf)

Related Parts	Information
ISL6402EVAL4	ISL6402EVAL4

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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 EVALUATION BOARDS BOARD NAME PACKAGE ISL6402EVAL4 ISL6402IR 28 Ld QFN ISL6402AEVAL4 ISL6402AIR 28 Ld QFN Recommended Test Equipment • A 4.5V-24V, 5A capable power supply • An electronic load • Four channel oscilloscope with probes • Precision digital multimeters 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. Output Adjustment Change the respective output voltage feedback resistors to modify the output voltage: VOUT1 RR-----78- VOUT3 VOUT2 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. tSS PWM1 0----.--8---V--5µA tSS PWM2 -0---.--8---V--5µA 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. 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.

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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 EVALUATION BOARDS

BOARD NAME

PACKAGE

ISL6402EVAL4

ISL6402IR
28 Ld QFN

ISL6402AEVAL4

ISL6402AIR
28 Ld QFN

Recommended Test Equipment
• A 4.5V-24V, 5A capable power supply
• An electronic load
• Four channel oscilloscope with probes
• Precision digital multimeters

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.

Output Adjustment

Change the respective output voltage feedback resistors to modify the output voltage:

VOUT1

RR-----78-

VOUT3

VOUT2

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.
tSS PWM1
0----.--8---V--5µA
tSS PWM2
-0---.--8---V--5µA

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.

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.

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Datasheet ID: ISL6402AEVAL4 639192