1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1IN+

1IN-

FEEDBACK

DTC

CT

RT

GND

C1

2IN+

2IN-

REF

OUTPUT CTRL

C2

E2

E1

D, N, NS, OR PW PACKAGE

(TOP VIEW)

TL594

www.ti.com

SLVS052H – APRIL 1988 – REVISED JANUARY 2014

TL594 Pulse-Width-Modulation Control Circuit

Check for Samples: TL594

1

FEATURES

DESCRIPTION

The TL594 device incorporates all the functions

•

Complete PWM Power-Control Circuitry

required

in

the

construction

of

a

pulse-width-

•

Uncommitted Outputs for 200-mA Sink or

modulation (PWM) control circuit on a single chip.

Source Current

Designed primarily for power-supply control, this

•

Output Control Selects Single-Ended or

device offers the systems engineer the flexibility to

tailor the power-supply control circuitry to a specific

Push-Pull Operation

application.

•

Internal Circuitry Prohibits Double Pulse

at Either Output

The TL594 device contains two error amplifiers, an

on-chip adjustable oscillator, a dead-time control

•

Variable Dead Time Provides Control Over

(DTC) comparator, a pulse-steering control flip-flop, a

Total Range

5-V regulator with a precision of 1%, an undervoltage

•

Internal Regulator Provides a Stable 5-V

lockout control circuit, and output control circuitry.

Reference Supply Trimmed to 1%

The error amplifiers have a common-mode voltage

•

Circuit Architecture Allows Easy

Synchronization

has a fixed offset that provides approximately 5%

•

dead time. The on-chip oscillator can be bypassed by

terminating RT to the reference output and providing

a sawtooth input to CT, or it can be used to drive the

common circuitry in synchronous multiple-rail power

supplies.

The uncommitted output transistors provide either

common-emitter or emitter-follower output capability.

Each device provides for push-pull or single-ended

output operation, with selection by means of the

output-control function. The architecture of these

devices prohibits the possibility of either output being

pulsed

twice

during

push-pull

operation.

The

undervoltage lockout control circuit locks the outputs

off until the internal circuitry is operational.

The TL594C device is characterized for operation

from 0°C to 70°C. The TL594I device is characterized

for operation from –40°C to 85°C.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 1988–2014, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.