AZ494 (Not Recommended for new design)

Description

The AZ494 is a voltage mode pulse width modulation switching regulator control circuit designed primarily for power supply control.

The AZ494 consists of a reference voltage circuit, two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, and an output control circuit. The precision of voltage reference (V_REF) is improved up to ±1% through trimming and this provides a better output voltage regulation. The AZ494 provides for push-pull or single-ended output operation, which can be selected through the output control.

The difference between AZ494A and AZ494C is that they have 4.95V and 5V reference voltage respectively.

The AZ494 is available in standard packages of PDIP-16 and SO-16.

Feature(s)

• 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
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

Application(s)

• SMPS
• Backlight Inverter
• Charger