TS494

1-7

2003/12 rev. A

TS494

Voltage Mode PWM Controller

Supply Voltage Range 7 V to 40V

Output Driving Current 200mA

Oscillator Frequency up to 200KHz

General Description

The TS494 incorporates on a single monolithic chip all the functions required in the construction of a

pulse-width-modulation control circuit. Designed primarily for power supply control, these devices offer the systems

engineer the flexibility to tailor the power supply control circuitry to his application.

The TS494 contains an error amplifier, an on-chip adjustable oscillator, a deed-time control comparator, pulse-steering

control flip-flop, a 5-volt, 5% precision regulator, and output-control circuits. The error amplifier exhibits a

common-mode voltage from –0.3V to Vcc –2V. The dead-time control comparator has a fixed offset that provides

synchronous multiple-rail power supplies. The uncommitted output transistor provide either common-emitter or

emitter-follower output capability. Each device provides for push-pull or single-ended output operation, which may be

selected through the output-control function. The architecture of these devices prohibits the possibility of either output

being pulsed twice during push-pull operation.

The TS494 is offered in SOP-16 and DIP-16 package.

Features

Complete PWM Power Control Circuitry

Uncommitted Outputs for 200mA Sink or Source

Current

Output Control Selects Single-Ended or Push –Pull

Operation

Internal Circuitry Prohibits Double Pulse at Either

Output

Variable Dead-Time Provides Control over Total

Range

Internal Regulator Provides a Stable 5-V Reference

Supply with 5% Tolerance

Circuit Architecture Allows Easy Synchronization

Pin Assignment

Applications

Charger

DC to DC converters

Ordering Information

Part No.

Operating Temp.

Package

TS494CD

DIP-16

TS494CS

0 ~ +70

SOP-16

SOP-16

DIP-16