PULSE-WIDTH-MODULATION CONTROL CIRCUITS
The AZ7500B/C is a voltage mode pulse width modu- · Stable 4.95V/5V Reference Voltage Trimmed to
lation switching regulator control circuit designed pri-
marily for power supply control.
· Uncommitted Output TR for 200mA Sink or
The AZ7500B/C consists of a reference voltage circuit, · Single-End or Push-Pull Operation Selected by
two error amplifiers, an on-chip adjustable oscillator, a
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 (VREF) is improved up to ±
Complete PWM Control Circuit with Variable
1% through trimming and this provides a better output
voltage regulation. The AZ7500B/C provides for push- · On-Chip Oscillator With Master or Slave Opera-
pull or single-ended output operation, which can be
selected through the output control.
The difference between AZ7500B and AZ7500C is that
they have 4.95V and 5V reference voltage respectively.
The AZ7500B/C is available in standard packages of
DIP-16 and SOIC-16.
· Back Light Inverter
Apr. 2006 Rev. 1. 2
Figure 1. Package Types of AZ7500B/C
BCD Semiconductor Manufacturing Limited