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ISL6753

ZVS Full-Bridge PWM Controller

The ISL6753 is a high-performance, low-pin-count

alternative zero-voltage switching (ZVS) full-bridge PWM

controller. Like the ISL6551, it achieves ZVS operation by

driving the upper bridge FETs at a fixed 50% duty cycle while

the lower bridge FETS are trailing-edge modulated with

adjustable resonant switching delays. Compared to the more

familiar phase-shifted control method, this algorithm offers

equivalent efficiency and improved overcurrent and light-

load performance with less complexity in a lower pin count

package.

This advanced BiCMOS design features low operating

current, adjustable oscillator frequency up to 2MHz,

adjustable soft-start, internal over temperature protection,

precision deadtime and resonant delay control, and short

propagation delays. Additionally, Multi-Pulse Suppression

ensures alternating output pulses at low duty cycles where

pulse skipping may occur.

Features

• Adjustable Resonant Delay for ZVS Operation

• Voltage- or Current-Mode Operation

• 3% Current Limit Threshold

•

175

µA Startup Current

• Supply UVLO

• Adjustable Deadtime Control

• Adjustable Soft-Start

• Adjustable Oscillator Frequency Up to 2MHz

• Tight Tolerance Error Amplifier Reference Over Line,

Load, and Temperature

• 5MHz GBWP Error Amplifier

• Adjustable Cycle-by-Cycle Peak Current Limit

• Fast Current Sense to Output Delay

• 70ns Leading Edge Blanking

• Multi-Pulse Suppression

• Buffered Oscillator Sawtooth Output

• Internal Over Temperature Protection

• Pb-free and ELV, WEEE, RoHS Compliant

Applications

• ZVS Full-Bridge Converters

• Telecom and Datacom Power

• Wireless Base Station Power

• File Server Power

• Industrial Power Systems

Ordering Information

PART NUMBER

TEMP. RANGE

(°C)

PACKAGE

PKG.

DWG. #

ISL6753AAZA

(See Note)

-40 to 105

16 Ld QSOP

(Pb-free)

M16.15A

Add -T suffix to part number for tape and reel packaging

NOTE: Intersil Pb-free products employ special Pb-free material

sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which are RoHS compliant and compatible

with both SnPb and Pb-free soldering operations. Intersil Pb-free

products are MSL classified at Pb-free peak reflow temperatures that

meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

Pinout

ISL6753 (QSOP)

TOP VIEW

RTD

SS

CT

OUTUR

OUTUL

CTBUF

OUTLR

RESDEL

RAMP

OUTLL

FB

VDD

VERR

VREF

CS

GND

1

2

4

3

5

6

7

89

10

11

12

13

14

15

16

Data Sheet

March 10, 2005

FN9182.1

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

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Copyright Intersil Americas Inc. 2005. All Rights Reserved

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