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KA3843AC Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part # KA3843AC
Description  SMPS Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA3843AC Datasheet(HTML) 1 Page - Fairchild Semiconductor

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©2005 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 KA3843AC are fixed PWM controller for Off-Line and
DC to DC converter applications. The internal circuits
include
UVLO, low start up current circuit, temperature
compensated reference, high gain error amplifier, current
sensing comparator, and high current totem-pole output for
driving a POWER MOSFET. Also KA3843AC provide low
start up current below 0.3mA and short shutdown delay
time typ. 100ns. The KA3843AC is 8.4V(on) and 7.6V(off).
The KA3843AC 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
KA3843AC
SMPS Controller


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