BCD AZ494DP-E1 Pulse-width-modulation control circuit Datasheet

Product Brief
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Description
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 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 ± 1.5% through trimming and this provides 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
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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 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
AZ494B/D
Parametric Table
AZ494B
4.95
AZ494D
5
Reference Voltage (V)
Reference Voltage Tolerance
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)
DIP-16
SOIC-16
Benefits
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Very competitive price
Additional Available Materials
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Jun. 2005
7 to 36
Package
Applications
SMPS
Back Light Inverter
Charger
1.5%
Samples
Data Sheet
Reliability Report
ESD Report
Application Notes
Demo Board
BCD Semiconductor Manufacturing Limited
Product Brief
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
AZ494B/D
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
AZ494BM
AZ494BM-E1
AZ494BM
AZ494BM-E1
Tube
AZ494BMTR
AZ494BMTR-E1
AZ494BM
AZ494BM-E1
Tape & Reel
AZ494DM
AZ494DM-E1
AZ494DM
AZ494DM-E1
Tube
AZ494DMTR
AZ494DMTR-E1
AZ494DM
AZ494DM-E1
Tape & Reel
AZ494BP
AZ494BP-E1
AZ494BP
AZ494BP-E1
Tube
AZ494DP
AZ494DP-E1
AZ494DP
AZ494DP-E1
Tube
Detailed information please refer to the relevant datasheet.
Sales Office:
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
Jun. 2005
Fax : 86-755-8368 3166
BCD Semiconductor Manufacturing Limited
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