AZ494C (Obsolete)

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, a dead-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 be selected through the output control. The difference between AZ494A and AZ494C is that they have 4.95V and 5V reference voltage respectively.

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

Application(s)

• SMPS
• Back Light Inverter
• Charger