AZ494A(2009) データシートの表示（PDF） - BCD Semiconductor

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AZ494A
(Rev.:2009)

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

BCD Semiconductor 

Data Sheet

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

General Description

Features

AZ494A/C

The AZ494A/C is a voltage mode pulse width modula- · Stable 4.95V/5V Reference Voltage Trimmed to

tion switching regulator control circuit designed pri-

±1.0% Accuracy

marily for power supply control.

· Uncommitted Output TR for 200mA Sink or

Source Current

The AZ494A/C consists of a reference voltage circuit, · Single-End or Push-Pull Operation Selected by

two error amplifiers, an on-chip adjustable oscillator, a

Output Control

dead-time control (DTC) comparator, a pulse-steering · Internal Circuitry Prohibits Double Pulse at Either

control flip-flop, and an output control circuit. The pre-

cision of voltage reference (VREF) is improved up to ±

·

Output

Complete PWM Control Circuit with Variable

1% through trimming and this provides a better output

Duty Cycle

voltage regulation. The AZ494A/C provides for push- · On-Chip Oscillator with Master or Slave Opera-

pull or single-ended output operation, which can be

tion

selected through the output control.

The difference between AZ494A and AZ494C is that

they have 4.95V and 5V reference voltage respectively.

The AZ494A/C is available in standard packages of

DIP-16 and SOIC-16.

Applications

· SMPS

· Back Light Inverter

· Charger

SOIC-16

DIP-16

Sep. 2009 Rev. 1. 4

Figure 1. Package Types of AZ494A/C

BCD Semiconductor Manufacturing Limited

1

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