BCD AZ494A Pulse-width-modulation control circuit Datasheet

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 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 precision of voltage reference (VREF) is
improved up to ± 1% through trimming and this provides
a better output voltage regulation. The AZ494A/C provides for push-pull or single-ended output operation,
which can be selected through the output control.
Features
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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 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 Operation
AZ494A/C
Parametric Table
AZ494A
4.95
AZ494C
5
Reference Voltage (V)
Reference Voltage Tolerance
1%
Frequency Change with Temperature (Max)
1%
Open Loop Voltage Gain (db)
95
Unity-Gain Bandwidth (KHz)
650
Output Saturation Voltage (Common Emitter)
(V)
1.1
Rise Time (ns)
100
Fall Time (ns)
25
Supply Voltage (V)
DIP-16
Package
SOIC-16
Benefits
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Higher Power Glitch Rejection
Very competitive price
Applications
Additional Available Materials
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SMPS
Back Light Inverter
Charger
Apr. 2006
7 to 36
Samples
Data Sheet
Reliability Report
ESD Report
Application Notes
Demo Board
BCD Semiconductor Manufacturing Limited
Product Brief
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
AZ494A/C
Pin Configuration
SOIC-16/DIP-16
1IN +
1
16
2IN +
1IN -
2
15
2IN -
FEEDBACK
3
14
REF
DTC
4
13
OUTPUT CTRL
CT
5
12
VCC
RT
6
11
C2
GND
7
10
E2
C1
8
9
E1
Ordering Information
Package
Temperature
Range
SOIC-16
-40 to 85oC
DIP-16
Part Number
Tin Lead
Marking ID
Lead Free
Tin Lead
Lead Free
Packing Type
AZ494AM
AZ494AM-E1
AZ494AM
AZ494AM-E1
Tube
AZ494AMTR
AZ494AMTR-E1
AZ494AM
AZ494AM-E1
Tape & Reel
AZ494CM
AZ494CM-E1
AZ494CM
AZ494CM-E1
Tube
AZ494CMTR
AZ494CMTR-E1
AZ494CM
AZ494CM-E1
Tape & Reel
AZ494AP
AZ494AP-E1
AZ494AP
AZ494AP-E1
Tube
AZ494CP
AZ494CP-E1
AZ494CP
AZ494CP-E1
Tube
Detailed information please refer to the relevant datasheet.
USA
3170 De La Cruz Blvd, Suite # 105 Santa Clara, CA 95054-2411,
U.S.A
Tel : +1-408-988 6388
Fax : +1-408-988 6386
Shanghai
8F, B Zone, 900 Yi Shan Road, Shanghai 200233,
China
Tel : 86-21-6495 9539
Fax : 86-21-6485 9673
Taiwan
4F, 298-1 Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel : 886-2-2656-2808
Fax : 886-2-2656-2806
Shenzhen
Room 27B, Tower C, No. 2070, Shennanzhong Road, Shenzhen
518031, China
Tel : 86-755-8368 3987
Fax : 86-755-8368 3166
Apr. 2006
BCD Semiconductor Manufacturing Limited
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