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PDF AZ2843 Data sheet ( Hoja de datos )
| Número de pieza | AZ2843 | |
| Descripción | (AZ2842 - AZ2845) Current Mode PWM Controller | |
| Fabricantes | Shanghai SIM-BCD Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AZ2843 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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et4U.comCURRENT MODE PWM CONTROLLER
heGeneral Description
Features
Data Sheet
AZ2842/3/4/5
taSThe AZ2842/3/4/5 are high performance fixed fre-
aquency current-mode PWM controller series.
·
Robust VREF Line/Load Regulation
Low Line Regulation : 4mV
.D Low Load Regulation : 4mV
wThese integrated circuits are optimized for off-line and
w DC-DC converter applications with minimum external
w components. They feature under-voltage lockout
·
High Stability of Reference Voltage over a Full
Temperature Range: 0.2mV/ oC
(UVLO) circuit with low start-up current, trimmed
oscillator for precise duty cycle control, current sense
comparator providing maximum current limiting and a
mtotem pole output stage for increasing output current.
In addition, these ICs also feature accurate protection
oagainst over-temperature, over-current and maximal
.coutput power.
The AZ2842 and AZ2844 have UVLO thresholds of
U15.5V(on) and 10V(off); The corresponding thresholds
for AZ2843 and AZ2845 are 8.4 V(on) and 7.8V(off).
· Operating Frequency up to 500KHz
· High PWM Frequency Stability over a Full Tem-
perature Range: 2.5%
· High PWM Frequency Stability under a Full Sup-
ply Voltage Range: 0.2%
· Accurate Over-temperature Protection with Hys-
teresis
· UVLO with Hysteresis
Applications
t4The AZ2842 and AZ2843 can operate approaching · Off-line Converter
e100% duty cycle; AZ2844 and AZ2845 can operate · DC-DC Converter
from zero to 50% duty cycle.
· Voltage Adapter
e· CRT Monitor Power Supply
hThese ICs are available in 3 packages: SOIC-8, DIP-8 · Desktop Power Supply
and SOIC-14.
· DVD/STB Power Supply
www.DataSSOIC-8
DIP-8
SOIC-14
www.DataSheet4U.comDec. 2004 Rev. 1. 1
Figure 1. Package Types of AZ2842/3/4/5
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
CURRENT MODE PWM CONTROLLER
Absolute Maximum Ratings (Note 1, 2)
AZ2842/3/4/5
Parameter
Supply Voltage
Output Current
Analog Inputs (8-pin: pin2,3, 14-pin: pin3,5)
Error Amp Output Sink Current
Power Dissipation at TA< 25 oC (DIP-8)
Power Dissipation at TA<25 oC (SOIC-8)
Power Dissipation at TA<25 oC (SOIC-14)
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
Symbol
VCC
IO
V(ANA)
ISINK(E.A)
PD (Note 3)
PD (Note 3)
PD (Note 3)
TSTG
TLEAD
Value
30
±1
-0.3 to 6.3
10
1000
460
725
-65 to 150
300
Unit
V
A
V
mA
mW
mW
mW
oC
oC
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Max-
imum Ratings" for extended periods may affect device reliability.
Note 2: All voltages are with respect to pin 5 and all currents are positive into specified terminal.
Note 3: Board thickness 1.6mm, board dimension 90mm x 90mm.
Recommended Operating Conditions
Parameter
Oscillation Frequency
Ambient Temperature
Symbol
f
TA
Min Max Unit
500 KHz
-40 85 oC
Dec. 2004 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
5 Page 
CURRENT MODE PWM CONTROLLER
Mechanical Dimensions
SOIC-8
Data Sheet
AZ2842/3/4/5
Unit: mm
4.9±0.10
7°
0.32
8°
7°
1.27
1.00
0.42±0.09
8°
D 6.00±0.20
D
20:1
4°±4°
φ0.8
R0.15
R0.15
3°±2°
Dec. 2004 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AZ2843.PDF ] | |
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