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AZ494B Datasheet

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

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AZ494B pdf
Data Sheet
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
General Description
Features
AZ494B/D
The AZ494B/D is a voltage mode pulse width modula-
tion switching regulator control circuit designed prima-
rily for power supply control.
The AZ494B/D consists of a reference voltage circuit,
two error amplifiers, an on-chip adjustable oscillator, a
dead-time control (DTC) comparator, a pulse-steering
control flip-flop, and an output control circuit. The
AZ494B/D is capable for push-pull or single-ended
output operation, which can be selected through the
output control.
AZ494B has 4.95V and AZ494D has 5V reference
voltage respectively. The precision of voltage reference
(VREF) is improved up to ± 1.5% through trimming
and this provides a better output voltage regulation.
The AZ494B/D is available in standard packages of
DIP-16 and SOIC-16.
· Stable 4.95V for AZ494B or 5V for AZ494D Ref-
erence Voltage Trimmed to ±1.5% Accuracy
· Uncommitted Output TR for 200mA Sink or
Source Current
· Single-End or Push-Pull Operation Selected by
Output Control
· Internal Circuitry Prohibits Double Pulse at Either
Output
· Complete PWM Control Circuit with Variable
Duty Cycle
· On-Chip Oscillator with Master or Slave Opera-
tion
Applications
· SMPS
· Back Light Inverter
· Charger
www.DataSheet4U.com
SOIC-16
DIP-16
Jun. 2005 Rev. 1. 1
Figure 1. Package Types of AZ494B/D
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AZ494B Datasheet

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

No Preview Available !

AZ494B pdf
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Pin Configuration
1IN +
1IN -
FEEDBACK
DTC
CT
RT
M / P Package
(SOIC-16 / DIP-16)
1 16 2IN +
2 15 2IN -
3 14 REF
4 13 OUTPUT CTRL
5 12 VCC
6 11 C2
GND
7
10 E2
C1 8
9 E1
Figure 2. Pin Configuration of AZ494B/D (Top View)
Output Function Control Table
Signal for Output Control
VI = GND
VI = VREF
Output Function
Single-ended or parallel output
Normal push-pull operation
Data Sheet
AZ494B/D
Functional Block Diagram
RT 6
5
CT
Oscillator
Dead-Time Control
Comparator
4
DTC
+
0.12V
1IN +
1IN -
1
2
Error Amplifier 1
+
+
PWM
Comparator
2IN + 16
2IN - 15
Error Amplifier 2
+
3
FEEDBACK
0.7mA
OUTPUT CTRL
Pulse-Steering
Flip-Flop
13
D
CK
Reference
Regulator
8 C1
Q1
9 E1
C2
11
Q2
10
E2
12
VCC
14
REF
7
GND
Jun. 2005 Rev. 1. 1
Figure 3. Functional Block Diagram of AZ494B/D
BCD Semiconductor Manufacturing Limited
2


Part Number AZ494B
Description PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Maker BCD Semiconductor
Total Page 12 Pages
PDF Download
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