Datasheet > AN-TL494

AN-TL494

更新时间： 2024-11-05 22:05:43

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德州仪器 - TI		/
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PULSE-WIDTH-MODULATION CONTROL CIRCUITS

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AN-TL494 数据手册

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

FEATURES

D, DB, N, NS, OR PW PACKAGE

(TOP VIEW)

•

Complete PWM Power-Control Circuitry

•

Uncommitted Outputs for 200-mA Sink or

Source Current

1IN+

1IN−

2IN+

2IN−

•

Output Control Selects Single-Ended or

Push-Pull Operation

FEEDBACK

DTC

14 REF

OUTPUT CTRL

Internal Circuitry Prohibits Double Pulse at

Either Output

Variable Dead Time Provides Control Over

Total Range

GND

Internal Regulator Provides a Stable 5-V

Reference Supply With 5% Tolerance

Circuit Architecture Allows Easy

Synchronization

DESCRIPTION

The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control

circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the

power-supply control circuitry to a specific application.

The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator,

a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.

The error amplifiers exhibit a common-mode voltage range from –0.3 V to V_CC– 2 V. The dead-time control

comparator 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 drive the common

circuits in synchronous multiple-rail power supplies.

The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The

TL494 provides for push-pull or single-ended output operation, which can be selected through the output-control

function. The architecture of this device prohibits the possibility of either output being pulsed twice during

push-pull operation.

The TL494C is characterized for operation from 0°C to 70°C. The TL494I is characterized for operation from

–40°C to 85°C.

AVAILABLE OPTIONS

PACKAGED DEVICES⁽¹⁾

SHRINK SMALL

OUTLINE

(DB)

THIN SHRINK

SMALL OUTLINE

(PW)

T_A

SMALL OUTLINE

(D)

PLASTIC DIP

(N)

SMALL OUTLINE

(NS)

0°C to 70°C

TL494CD

TL494ID

TL494CN

TL494IN

TL494CNS

—

TL494CDB

—

TL494CPW

—

–40°C to 85°C

(1) The D, DB, NS, and PW packages are available taped and reeled. Add the suffix R to device type (e.g., TL494CDR).

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.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...17

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