Datasheet > GL494

GL494

更新时间： 2024-11-01 22:32:47

品牌	Logo	应用领域
海力士 - HYNIX		/
页数	文件大小	规格书
7页	95K
描述
PWM CONTROL CIRCUIT

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GL494 数据手册

GL494

PWM CONTROL CIRCUIT

Description

Pin Configuration

The GL494 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, the GL494 contains an on-chip 5-volt

regulator, two error amplifiers, adjustable oscillator, dead-

time control comparator, pulse-steering flip-flop, and

output-control circuitry. The uncommitted output

transistors pro-vide either common-emitter or emitter-

follower output capability. Push-pull or single-ended

output operation may be selected through the output-

control function. The ar-chitecture of the GL494 prohibits

the possibility of either output being pulsed twice during

push-pull operation.

NONINV INPUT

INV. INPUT

NON INV INPUT

INV. INPUT

REF. OUT

FEEDBACK

DEAD TIME CONTROL

OUTPUT CONTROL

Vcc

GND

Features

— Complete PWM Power Control Circuitry

— Uncommitted Outputs for 200mA Sink or Source

— Output Control Selects Single-Ended or Push-Pull

Operation

— Internal Circuitry Prohibits Double Pulse at Either

Output

— Internal Regulator Provides a Stable 5V Reference

Supply

— Variable Dead-Time Provides Control Over Total

Range

Function Table

Output Control

Grounded

Output Function

Single-ended or Parallel Output

Normal Push-Pull Operation

At V_ref

Block Diagram

OUTPUT

CONTROL

OSCILLATOR

(See Function Table)

PULSE STEERING

(13)

FLIP FLOP

0.1V

(4)

DEAD

TIME

CONTROL

ERROR AMPLIFIERS

NONINVERTING(1)

INPUT

PWM

COMPARATOR

E1(9) C1(8)

INVERTING

INPUT

(2)

ERROR AMP1

VCC

(12)

REFERENCE

NONINVERTING(16)

INPUT

REF OUT

(14)

REGULATOR

INVERTING

INPUT

(15)

ERROR AMP2

GND

(7)

E1(10) C2(11)

(3)

FEEDBACK

12 3 4 5 6 7

中文翻译

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