ISL6700EVAL1 Intersil, ISL6700EVAL1 Datasheet

ISL6700EVAL1

Manufacturer Part Number

ISL6700EVAL1

Description

EVALUATION BOARD ISL6700

Manufacturer

Intersil

Type

Power Management: MOSFET Driverr

Datasheet

1.ISL6700EVAL1.pdf (2 pages)

Specifications of ISL6700EVAL1

Contents

Fully Assembled Evaluation Board

For Use With/related Products

ISL6700

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current page: 1 of 2
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Description

The ISL6700 General Purpose Design Tool

(ISL6700EVAL1Z) is a very simple evaluation board which

can help the user rapidly construct an isolated DC/DC

converter in several configurations. The board consists of

the Intersil ISL6700 Half-Bridge Driver IC, two Intersil

IRFR120 MOSFETs, a bootstrap diode, a bootstrap

capacitor and two input voltage decoupling capacitors. The

ISL6700 can operate at frequencies in excess of 500kHz

and has typical propagation delay times of 30ns. It has

1.25A output drive capability and can switch an IRFR120

load with rise and fall times of less than 20ns.

Application Information

The ISL6700 General Purpose Design Tool

(ISL6700EVAL1Z) is intended for users who have some

experience in power converter design. The 80V rating of the

ISL6700 makes it an ideal choice for many isolated DC/DC

converters, which are point-of-load converters in a

distributed power architecture. To insure adequate design

margin, the maximum voltage that should be applied to this

input should be less than 80VDC. Three possible application

converters are described briefly as follows:

Application #1: Two-Switch Forward Converter

To use the ISL6700EVAL1Z as part of a two-switch forward

converter, the user needs the configuration depicted in

Figure 2. In this topology, both MOSFETs are turned on and

off together, therefore, HI and LI are tied together. The input

signal comes from a pulse-width modulator (PWM)

controller, which is sensing the output voltage (and input

switch current if current-mode control is used). The Schottky

rectifiers clamp the reverse swing of the power transformer

and must be rated to handle the input voltage.

0.1µ

VDD

FIGURE 1. ISL6700EVAL1Z SCHEMATIC

ISL6700

0.022µ

0.47µ

Application Note

ISL6700EVAL1Z General Purpose Design Tool

VIN

Q2-S

Q1-D

GND

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Application #2: Half-Bridge Converter

To use the ISL6700EVAL1Z as part of a half-bridge

converter, the user needs the configuration depicted in

Figure 3. In this topology, the MOSFETs are driven

alternately, with some dead time between turn-off of one and

turn-on of the other. Therefore, HI and LI are driven with

alternating signals PWM

controller.

Application #2: Active-Clamp Forward Converter

To use the ISL6700EVAL1Z as part of an active-clamp

forward converter, the user needs the configuration depicted

in Figure 4. In this topology, the MOSFETs are again driven

alternately, and HI and LI need to be driven alternately as

well. The high-side MOSFET (Q2 in the ISL6700EVAL1Z

board), along with capacitor C

as a means to reset the power transformer in a lossless

manner. This topology lends itself well to running at duty

cycles exceeding 50%, unlike Applications 1 and 2.

PWM

FIGURE 2. TWO-SWITCH FORWARD CONVERTER

August 12, 2008

All other trademarks mentioned are the property of their respective owners.

PWM

FIGURE 3. HALF-BRIDGE CONVERTER

ISL6700EVAL1Z

Intersil (and design) is a registered trademark of Intersil Americas Inc.

VDD

BOARD

GND

VIN

and PWM

Q1-D

Q2-S

Q1-D

RESET

, is used in this topology

ISOLATION

from the PWM

ISOLATION

AN1006.2

SECONDARY

CIRCUIT

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ISL6700EVAL1 Summary of contents

Page 1

... Three possible application converters are described briefly as follows: Application #1: Two-Switch Forward Converter To use the ISL6700EVAL1Z as part of a two-switch forward converter, the user needs the configuration depicted in Figure 2. In this topology, both MOSFETs are turned on and off together, therefore, HI and LI are tied together. The input ...

Page 2

... VDD VIN HI Q2-S C RESET ISL6700EVAL1Z BOARD LI Q1-D PWM A GND PWM ISOLATION PWM B FIGURE 4. ACTIVE-CLAMP FORWARD CONVERTER ISL6700EVAL1Z Parts List REFERENCE ITEM QUANTITY DESIGNATOR Q1 (Note TP1 thru TP8 8 1 N/A NOTE: Can be substituted for item #4. 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 ...

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