Product Brief
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
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 refer-
ence voltage circuit, two error amplifiers, an on-chip
adjustable oscillator, a dead-time control (DTC) compara-
tor, a pulse-steering control flip-flop, and an output con-
trol circuit. The precision of voltage reference (V
REF
) is
improved up to
±
1% through trimming and this provides
a better output voltage regulation. The AZ494A/C pro-
vides for push-pull or single-ended output operation,
which can be selected through the output control.
AZ494A/C
Parametric Table
AZ494A
Reference Voltage (V)
AZ494C
Reference Voltage Tolerance
Frequency Change with Temperature (Max)
Open Loop Voltage Gain (db)
Unity-Gain Bandwidth (KHz)
Output Saturation Voltage (Common Emitter)
(V)
Rise Time (ns)
5
1%
1%
95
650
1.1
100
25
7 to 36
DIP-16
Package
SOIC-16
4.95
Features
·
·
·
·
·
·
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 Out-
put 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
Fall Time (ns)
Supply Voltage (V)
Benefits
·
·
Higher Power Glitch Rejection
Very competitive price
Applications
·
·
·
SMPS
Back Light Inverter
Charger
Additional Available Materials
·
·
·
·
·
·
Samples
Data Sheet
Reliability Report
ESD Report
Application Notes
Demo Board
Apr. 2006
BCD Semiconductor Manufacturing Limited