Diodes Incorporated

AZ494A (Obsolete)

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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.


· 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


· SMPS · Back Light Inverter · Charger

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2642 2023-09-05 2024-03-05 Device End of Life (EOL)
PCN-2594 2022-08-31 2023-02-28 Device End of Life (EOL)
PCN-2493 2020-12-28 2021-03-28 Qualified Additional A/T Sites and Bill of Materials (BOM)
PCN-2481 2020-08-26 2021-02-26 Device End of Life (EOL)