AZ494A_06 Datasheet, PDF (1/13 Pages) BCD Semiconductor Manufacturing Limited – PULSE-WIDTH-MODULATION CONTROL CIRCUITS

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 prima-
±1.0% Accuracy
rily 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 pre-
cision of voltage reference (V_REF) 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
Apr. 2006 Rev. 1. 2
Figure 1. Package Types of AZ494A/C
BCD Semiconductor Manufacturing Limited
1