TL494 datasheet(1/6 Pages) HTC | Pulse-Width-Modulation Control Circuits

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Pulse-Width-Modulation Control Circuits

TL494

FEATURES

● Complete PWM Power Control Circuitry

● Uncommitted Outputs for 200 Ma 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,5%

● Circuit Architecture Allows Easy Synchronization

DESCRIPTION

The TL494 incorporate on a single monolithic chip all the functions

required in the construction of a pulse-width-modulation control,

these devices offer the systems engineer the flexibility to tailor

ORDERING INFORMATION

the power supply control circuitry to his application.

The TL494 contains an error amplifier, an on-chip adjustable

oscillator, a dead-time control comparator, pulse-steering control

flip-flop, a 5-volt, 5% precision regulator, and output-control circuit.

The error amplifier exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts. The dead-time control

comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip

oscillator may be bypassed by terminating RT (pin 6) to the reference output and providing a sawtooth in put to

CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The

uncommited output transistors 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 funct

-ion. The architecture of these devices prohibits the possibility of either output being pulsed twice during push

-pull operation.

Functional Block Diagram

HTC

TL494N

18 DIP

Device

Package

TL494D

16 SOP

145

Mar. 2006-Rev06

SOP16/DIP16

(TOP VIEW)

NONINV

INPUT

INV INPUT

FEEDBACK

DEAD-TIME

CONTROL

GND

NONINV

INPUT

INV INPUT

REF OUT

Vcc

OUTPUT

CONTROL

Error

AMP 1

Error

AMP 2

OSCILLATOR

REFERENCE

DEAD

TIME

CONTROL

0.1V

DEAD-TIME CONTROL COMPARATOR

PWM COMPARATOR

FEEDBACK

ERROR AMPLIFIER

NONINVERTING INPUT

INVERTING INPUT

NONINVERTING INPUT

INVERTING INPUT

PULSE-STEERING FLIP-FLOP

Vcc

Vref

GND

OUTPUT CONTROL

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