ISL6562EVAL1【PDF 1/11 页】EVALUATION BOARD ISL6562

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ISL6560/62 Evaluation Board

Application Note

April 2002

AN1009.0

Author: Hal Wittlinger

Introduction

The ISL6560/62 Evaluation Board was designed to

accommodate either the ISL6560 or the ISL6562 power

supply controller ICs. CORE voltage is set by a ?ve bit DAC

that is usually programmed by the microprocessor. For this

board, DAC codes are entered via a ?ve position dip switch.

Power supply input voltages may be applied through three

banana posts or an ATX connector on the board. With an

ATX supply the main input voltage to the converter is 5V. The

ATX 12V supply powers the ISL6560/62, the HIP6601 gate

drivers and the transient load generator. A toggle switch is

provided on the board to enable the ATX supply.

Converter input voltage via the banana connectors can

range from 5V to 12V. A separate connector supplies 12V to

the ISL6560/62, transient load generator and the gate

drivers as described above.

Figure 1 shows the Evaluation Board. Note the ATX

connector at the top of the board. The ATX power switch

SW2, is located to the right of the connector.

Description

This board was design so that a wide range of input voltages

could be used. Burndy binding posts at the lower end of the

board provide the high current connections for the output

load.

Just above the output connectors is a pulse generator to

provide 40A transient loading to verify response to pulse

loading of the supply. Scope probe connectors monitor the

current pulse, and output voltage.

Extra output capacitor locations are available to modify the

output capacitor con?guration or type of capacitors. 22 μ F

ceramic capacitors accompany the bulk electrolytic

capacitors. In an application where the supply is connected

to an active load, high frequency capacitors should be

located as close as possible to the load to help reduce

undesired transient voltage changes at the load.

The ISL6560/62 is located on the left side of the board.

Immediately below the controller IC is the POWER GOOD

monitoring circuit. A dual RED-GREEN LED indicator is

green when the CORE voltage is within the de?ned data

sheet limits. Figure 13 shows a schematic diagram of the

POWER GOOD monitoring circuit.

ISL6560 and ISL6562

Figure 2 shows a simpli?ed functional block diagram of these

devices, outlining the major differences between the two ICs.

REF

3V REF

VCC

UVLO and

BIAS CIRCUITS

WRGD

X0.82

OSCILLATOR

PWM1

LOGIC

VID4

VID3

X1.24

OVP

CONTROL

PWM2

CS+

VID2

D/A

CMP

VID1

VID0

E/A

CS-

COMP

DAC Codes

ISL6560 - VRM 9.0

ISL6562 - VRM 8.5

GND

CS Threshold Voltage

ISL6560 - 157mV

ISL6562 - 79mV

FIGURE 2. SIMPLIFIED BLOCK DIAGRAM SHOWING

MAJOR DEVICE DIFFERENCES

FIGURE 1. EVALUATION BOARD

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.

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