AZ494C

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 precision 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 PULSE-WIDTH-MODULATION CONTROL CIRCUITS Pin Configuration M/P Package (SOIC-...