脉宽调制控制电路 DIODES AZ494 TL494

General Description
The AZ494A/C is a voltage mode pulse width modulation switching regulator control circuit designed primarily for power supply control.
The AZ494A/C consists of a reference voltage circuit,two error amplifiers, an on-chip adjustable oscillator, adead-time control (DTC) comparator, a pulse-steering control flip-flop, and an output control circuit. The precision of voltage reference (VREF) is improved up to ±1% through trimming and this provides a better output voltage regulation. The AZ494A/C provides for pushpull or single-ended output operation, which can beselected 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.

Features
· Stable 4.95V/5V Reference Voltage Trimmed to±1.0% Accuracy
· Uncommitted Output TR for 200mA Sink or Source Current
· Single-End or Push-Pull Operation Selected by Output Control
· Internal Circuitry Prohibits Double Pulse at Either Output
· Complete PWM Control Circuit with Variable Duty Cycle
· On-Chip Oscillator with Master or Slave Operation

Applications
· SMPS
· Back Light Inverter
· Charger

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