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KA3882E Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part # KA3882E
Description  SMPS Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA3882E Datasheet(HTML) 1 Page - Fairchild Semiconductor

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©2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
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 KA3882E/KA3883E is a fixed PWM controller for
Off-Line and DC to DC converter applications. The internal
circuits include a UVLO, a low start-up current circuit, a
temperature compensated reference, a high gain error
amplifier, a current sensing comparator, and the high current
totem-pole output for driving a POWER MOSFET. Also the
KA3882E/KA3883E provides low start-up current below
0.3mA and short shutdown delay time typ. 100ns. The
KA3882E has UVLO threshold of 16V(on) and 10V(off).
The KA3883E is 8.4V(on) and 7.6V(off). The KA3882E and
KA3883E can operate within 100% duty cycle.
8-DIP
8-SOP
1
1
Internal Block Diagram
8
+
-
7
5
SET/
RESET
5V
VREF
Internal
Bias
Good LOGIC
2
R
S
OSCILLATOR
1
3
4
T
7
6
5
UVLO
29V
22V
1/3
Error Amp
1/2VREF
1V
C.S
Comp.
PWM
LATCH
VREF
VFB
COMP
C.S
RT/CT
OUTPUT
VCC
GND
PWR
VC
PWR
GND
KA3882E/KA3883E
SMPS Controller


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