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PDF UC3842A Data sheet ( Hoja de datos )
| Número de pieza | UC3842A | |
| Descripción | (UC3842A / UC3843A) SMPS Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC3842A (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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UC3842A/UC3843A
SMPS Controller
www.fairchildsemi.com
Features
• Low Start Current 0.2mA (typ)
• Operating Range Up To 500KHz
• Cycle by Cycle Current Limiting
• Under Voltage Lock Out With Hysteresis
• Short Shutdown Delay Time: typ.100ns
• High Current Totem-pole Output
• Output Swing Limiting: 22V
Description
The UC3842A/UC3843A are fixed PWM controller for Off-
Line and DC to DC converter applications. The internal cir-
cuits include UVLO, low start up current circuit, tempera-
ture compensated reference, high gain error amplifier,
current sensing comparator, and high current totem-pole out-
put for driving a POWER MOSFET. Also UC3842A/
UC3843A provide low start up current below 0.3mA and
short shutdown delay time typ. 100ns. The UC3842A has
UVLO threshold of 16V(on) and 10V(off). The UC3843A is
8.4V(on) and 7.6V(off). The UC3842A and UC3843A can
operate within 100% duty cycle.
8-DIP
Internal Block Diagram
8-SOP
1
1
VREF 8
Internal
Bias
5V
VREF
SET/
RESET
Good LOGIC
UVLO
VFB 2
COMP 1
1/2VREF
Error Amp
+
-
1/3
1V
C.S PWM
Comp. LATCH
R
S
C.S 3
T
RT/CT 4
OSCILLATOR
7 VCC
29V
5 GND
7
PWR
VC
22V 6 OUTPUT
5
PWR
GND
©2000 Fairchild Semiconductor International
Rev. 5.0
1 page  
Mechanical Dimensions (Continued)
Package
UC3842A/UC3843A
8-SOP
1.55 ±0.20
0.061 ±0.008
MIN
0.1~0.25
0.004~0.001
#1 #8
#4 #5
6.00 ±0.30
0.236 ±0.012
3.95 ±0.20
0.156 ±0.008
1.80
0.071
MAX
0.50 ±0.20
0.020 ±0.008
5.72
0.225
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UC3842A.PDF ] | |
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