Datasheet > AZ494M

AZ494M

更新时间： 2024-10-26 06:38:55

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描述
PULSE-WIDTH-MODULATION CONTROL CIRCUITS

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AZ494M 数据手册

Data Sheet

Advanced Analog Circuits

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

AZ494

General Description

Features

The AZ494 incorporates on a single chip all the func-

tions required in the construction of a pulse-width-

modulation (PWM) control circuit. Designed primarily

for power supply control, this device offers the flexibil-

ity to tailor the power supply control circuitry to a spe-

cific application.

Complete PWM power-control circuitry

Uncommitted outputs for 200mA sink or source

current

Output control selects single-ended or push-pull

operation

Internal circuitry prohibits double pulse at either

output

The AZ494 contains two error amplifiers, an on-chip

adjustable oscillator, a dead-time control (DTC) com-

parator, a pulse-steering control flip-flop, a 5V regula-

tor, and output control circuits. The error amplifiers

exhibit a common-mode voltage range from -0.3V to

Variable dead time provides control over total

range

Internal regulator provides a stable 5V reference

supply with 5% tolerance

Circuit architecture allows easy synchronization

-2V. The dead-time control comparator has a fixed

offset that provides approximately 5% dead time. The

on-chip oscillator can be bypassed by terminating the

RT pin to the reference output and providing a saw-

tooth input to the CT pin, or it can drive the common

circuits in synchronous multiple-rail power supplies.

Applications

SMPS

Back Light Inverter

The uncommitted output transistors can be configured

in either common-emitter or emitter-follower output

topology. The AZ494 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 AZ494 is

characterized for operation from -40 C to 85 C.

DIP-16

SOIC-16

Figure 1. Package Types of AZ494

March. 2003

Rev.1.0

12 3 4 5 6 7...12

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