AZ494B Datasheet, PDF (1/2 Pages) BCD Semiconductor Manufacturing Limited – PULSE-WIDTH-MODULATION CONTROL CIRCUITS

PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Product Brief
AZ494B/D
Description
Parametric Table
The AZ494B/D is a voltage mode pulse width modulation
switching regulator control circuit designed primarily for
power supply control. The AZ494B/D 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 ± 1.5% through trimming and this pro-
vides a better output voltage regulation. The AZ494B/D
provides for push-pull or single-ended output operation,
which can be selected through the output control.
Features
· Stable 4.95V/5V Reference Voltage Trimmed to
±1.5% 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
AZ494B
4.95
Reference Voltage (V)
AZ494D
5
Reference Voltage Tolerance
1.5%
Frequency Change with Temperature (Max)
1%
Open Loop Voltage Gain (db)
95
Unity-Gain Bandwidth (KHz)
800
Output Saturation Voltage (Common Emitter)
(V)
1.1
Rise Time (ns)
100
Fall Time (ns)
25
Supply Voltage (V)
7 to 36
Package
DIP-16
SOIC-16
Benefits
· Very competitive price
Applications
· SMPS
· Back Light Inverter
· Charger
Additional Available Materials
· Samples
· Data Sheet
· Reliability Report
· ESD Report
· Application Notes
· Demo Board
Jun. 2005
BCD Semiconductor Manufacturing Limited