1

®

FN9111.3

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

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Copyright © Intersil Americas Inc. 2003-2004. All Rights Reserved.

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ISL6740, ISL6741

Flexible Double Ended Voltage and

Current Mode PWM Controllers

The ISL6740, ISL6741 family of adjustable frequency, low

power, pulse width modulating (PWM) voltage mode

(ISL6740) and current mode (ISL6741) controllers is

designed for a wide range of power conversion applications

using half-bridge, full bridge, and push-pull configurations.

These controllers provide an extremely flexible oscillator that

allows precise control of frequency, duty cycle, and

deadtime.

This advanced BiCMOS design features low operating

current, adjustable switching frequency up to 1MHz,

adjustable soft start, internal and external over temperature

protection, fault annunciation, and a bidirectional SYNC

signal that allows the oscillator to be locked to paralleled

units or to an external clock for noise sensitive applications.

Features

• Precision Duty Cycle and Deadtime Control

•95

µA Startup Current

• Adjustable Delayed Over Current Shutdown and Re-Start

(ISL6740)

• Adjustable Short Circuit Shutdown and Re-Start

• Adjustable Oscillator Frequency Up to 2MHz

• Bidirectional Synchronization

• Inhibit Signal

• Internal Over Temperature Protection

• System Over Temperature Protection Using a Thermistor

or Sensor

• Adjustable Soft Start

• Adjustable input Under Voltage Lockout

• Fault Signal

• Tight Tolerance Voltage Reference Over Line, Load, and

Temperature

• Pb-free available

Applications

• Telecom and Datacom Power

• Wireless Base Station Power

• File Server Power

• Industrial Power Systems

• DC Transformers and Buss Regulators

Pinout

ISL6740, ISL6741 (SOIC, TSSOP)

TOP VIEW

Ordering Information

PART NUMBER

TEMP. RANGE

PACKAGE

PKG.

DWG. #

ISL6740IB

-40 to 105

16 Ld SOIC

M16.15

ISL6740IBZ

(See Note)

-40 to 105

16 Ld SOIC

(Pb-free)

M16.15

ISL6740IV

-40 to 105

16 Ld TSSOP

M16.173

ISL6740IVZ

(See Note)

-40 to 105

16 Ld TSSOP

(Pb-free)

M16.173

ISL6741IB

-40 to 105

16 Ld SOIC

M16.15

ISL6741IBZ

(See Note)

-40 to 105

16 Ld SOIC

(Pb-free)

M16.15

ISL6741IV

-40 to 105

16 Ld TSSOP

M16.173

ISL6741IVZ

(See Note)

-40 to 105

16 Ld TSSOP

(Pb-free)

M16.173

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 is 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-020B.

x =CONTROL MODE

0

Voltage Mode

1

Current Mode

OUTA

GND

SCSET

SYNC

CS

OUTB

OTS

FAULT

1

2

3

4

5

6

7

16

15

14

13

12

11

10

8

9

UV

SS

Data Sheet

July 2004