UNISONIC TECHNOLOGIES CO., LTD

TL594

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2009 Unisonic Technologies Co., Ltd

QW-R103-031.B

PULSE-WIDTH-MODULATION

CONTROL CIRCUIT

DESCRIPTION

The UTC TL594 is a PWM (Pulse Width Modulation) control

circuit, incorporating two error amplifiers, an on-chip adjustable

oscillator, a DTC (Deadtime Control) comparator, a pulse-steering

control flip-flop, a regulator rated 5V with 1% accuracy, an UVLO

(Undervoltage Lockout) control circuit and an output control circuit.

The two error amplifiers have a common-mode voltage varies from

-0.3 V to VCC-2 V. The DTC comparator with a fixed-offset offers

dead time nearly 5%. The UVLO circuit forbids the output until the

internal circuitry is operational. The internal oscillator is used to drive

the common circuits in synchronous multiple-rail power supplies,

when be bypassed by terminating RT to the reference output and

providing an external input of sawtooth to CT.

The uncommitted output transistors have the capabilities of

either common-emitter or emitter-follower output. The output control

can select the push-pull or single-ended output operation for each

device. This chip is not allowed to appear the double pulse status for

either output during push-pull output operation due to its structure.

The UTC TL594 is generally used for the power supply control

circuits, which apply to a large area.

FEATURES

* Adjustable dead time

* Uncommitted outputs transistor rated to 200mA sink or source

current

* Single-Ended or Push-Pull operation selected by output control

* Double pulse is not allowed at either output due to its architecture

* 5V Internal reference voltage (1% accuracy)

DIP-16

SOP-16

ORDERING INFORMATION

Order Number

Lead Free

Halogen Free

Package

Packing

TL594L-D16-T

TL594G-D16-T

DIP-16

Tube

TL594L-S16-R

TL594G-S16-R

SOP-16

Tape Reel