IRDCIP2003A-C【PDF 1/8 页】KIT DESIGN 4PH 160A 1MHZ IP2003A

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R E F E R E N C E D E S I G N IRDCiP2003A-C

International Rectifier ? 233 Kansas Street, El Segundo, CA 90245 USA

IRDCiP2003A-C: 1MHz, 160A, Synchronous Buck

Converter Using iP2003A

Overview

This reference design is capable of delivering up to a current of

160A with the enclosed heatsink attached at an ambient

temperature of 60oC with 400LFM or an ambient temperature of

45oC with 200LFM of airflow. Performance graphs and waveforms

are provided in figures 1–9. The figures and table in pages 5 – 8

are provided as a reference design to enable engineers to very

quickly and easily design a 4-phase converter. Refer to the data

sheet for the controller listed in the bill of materials in order to

optimize this design to your specific requirements. A variety of other

controllers may also be used, but the design will require layout and

control circuit modifications.

Demoboard Quick Start Guide

Initial Settings:

The output is set to 1.3V, but can be adjusted from 0.8V to 3.3V by changing the voltage divider values of R3 and R32 according

to the following formula:

R3 = R32 = (24.9k x 0.8) / (VOUT - 0.8)

The switching frequency per phase is set to 1MHz with the frequency set resistor R4. This creates an effective output frequency of

4MHz. The graph in figure 11 shows the relationship between R4 and the switching frequency per phase. The frequency may be

adjusted by changing R4 as indicated; however, extreme changes from the 1MHz set point may require redesigning the control

loop and adjusting the values of input and output capacitors. Refer to the SOA graph in the iP2003A datasheet for maximum

operating current at different conditions.

Procedure for Connecting and Powering Up Demoboard:

1. Apply input voltage across (+12V) across VIN and PGND.

2. Apply load across VOUT pads and PGND pads.

3. Adjust load to desired level. See recommendations below.

IRDCiP2003A-C Recommended Operating Conditions

(refer to the iP2003A datasheet for maximum operating conditions)

Input voltage: 5V - 12V

Note: If Vin = 5V, then connect Vin to test point TP3 and Terminal T1 and remove jumper J1. Refer to schematic for details.

Output voltage: 0.8 - 3.3V

Switching Freq: 1MHz per phase, 4MHz effective output frequency.

Output current: This reference design is capable of delivering up to 160A with the enclosed heatsink attached, at an

ambient temperature of 60oC with 400LFM of airflow, or an ambient temperature of 45oC with 200LFM of

airflow.

Additionally, the threshold of the POR circuit should be adjusted to allow the supply to sequence properly.

12/03/04

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