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PDF AZ494B Data sheet ( Hoja de datos )
| Número de pieza | AZ494B | |
| Descripción | PULSE-WIDTH-MODULATION CONTROL CIRCUITS | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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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
1 page  
Data Sheet
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Electrical Characteristics
TA = 25oC, VCC=15V, f=10KHz unless otherwise noted.
Parameter
Symbol Conditions (Note 4)
Reference Section
Output Reference
Voltage
for AZ494B VREF IREF=1mA
for AZ494D VREF IREF=1mA
AZ494B/D
Min Typ Max Unit
4.875 4.95 5.025
4.925 5.0 5.075
V
V
Line Regulation
RLINE VCC = 7V to 36V
2 25
Load Regulation
RLOAD IREF=1mA to 10mA
1 15
Short-Circuit Output Current(Note 5)
ISC VREF = 0V
25
Oscillator Section, CT = 0.01µF, RT = 12KΩ (See Figure 4)
Frequency
fosc
10
Standard Deviation of Frequency
(Note 6)
All values of VCC, CT, RT and TA
constant
100
Frequency Change with Voltage
VCC=7V to 36V, TA = 25oC
1
Frequency Change with Temperature
(Note 7)
∆TA= MIN to MAX
10
Error-Amplifier Section
Input Offset Voltage
VIO VO (FEEDBACK) = 2.5V
2 10
Input Offset Current
IIO VO (FEEDBACK) = 2.5V
25 250
Input Bias Current
IBIAS VO (FEEDBACK) = 2.5V
0.2 1
Common-Mode Input Voltage Range
VCM VCC=7V to 36V
-0.3 VCC-
2
Large-Signal Open-Loop Voltage
Gain
AVO ∆VO = 3V, RL =2KΩ,
VO =0.5V to 3.5V
70 95
Unity-Gain Bandwidth
GB
800
Common-Mode Rejection Ratio
CMRR VCC=7V to 36V
65 80
Output Sink Current (FEEDBACK)
ISINK VID = -15mV to -5V,
V(FEEDBACK) = 0.7V
- 0.3 - 0.7
Output Source Current (FEEDBACK) ISOURCE VID = 15mV to 5V, V(FEED-
BACK) = 3.5V
2
Output Section
Collector Off-State Current
IC, OFF VCE = 36V, VCC=36V
2 100
Emitter Off-State Current
IE, OFF VCC = VC = 36V, VE = 0
-100
Collector-Emitter
Saturation Voltage
Common
Emitter
Emitter
Follower
VE = 0, IC =200mA
VO (C1 or C2) = 15V,
IE = -200mA
1.1 1.3
1.5 2.5
mV
mV
mA
KHz
Hz/KHz
Hz/KHz
Hz/KHz
mV
nA
µA
V
dB
KHz
dB
mA
mA
µA
µA
V
Jun. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
5 Page 
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Mechanical Dimensions (Continued)
DIP-16
Data Sheet
AZ494B/D
Unit: mm(inch)
6° 1.524(0.060)TYP
4°
0.254(0.010)
0.360(0.014)
0.560(0.022)
3.710(0.146)
4.310(0.170)
2.540(0.100)
TYP
0.510(0.020)MIN
3.000(0.118)
3.600(0.142)
7.620(0.300)TYP
5°
6°
0.700(0.028)
3.200(0.126)
3.600(0.142)
4°
0.204(0.008)
0.360(0.014)
8.200(0.323)
9.400(0.370)
Φ3.000(0.118)
Depth
0.050(0.002)
0.150(0.006)
6.200(0.244)
6.600(0.260)
R0.750(0.030)
18.800(0.740)
19.200(0.756)
Jun. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AZ494B.PDF ] | |
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