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Fairchild Semiconductor Electronic Components Datasheet

KA3842AC Datasheet

SMPS Controller

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KA3842AC pdf
KA3842AC/KA3842AE
SMPS Controller
Features
„ Low start current 0.2mA (Typ.)
„ Operating range up to 500kHz
„ Cycle by cycle current limiting
„ Under Voltage Lock Out (UVLO) with hysteresis
„ Short shutdown delay time: Typ.100ns
„ High current totem-pole output
„ Output swing limiting: 22V
March 2006
Description
The KA3842AC/KA3842AE are fixed PWM controllers
for Off Line and DC to DC converter applications. The
internal circuits include UVLO, low start up current, tem-
perature compensated reference, high gain error ampli-
fier, current sensing comparator, and high current totem
pole output for driving a POWER MOSFET. Also
KA3842AC/KA3842AE provides low start up current
below 0.3mA and short shutdown delay time, typically
100ns. The KA3842AC/KA3842AE has a UVLO thresh-
old of 16V(on) and 10V(off). The KA3842AC/KA3842AE
can operate within a 100% duty cycle.
1
8-DIP
Ordering Information
Part Number
KA3842AC
KA3842AE
Operating
Temp. Range
-0 to +70°C
Pb-Free
Yes
Package
8-DIP
Packing Method
Tube
©2006 Fairchild Semiconductor Corporation
KA3842AC/KA3842AE Rev. 1.0.1
1
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

KA3842AC Datasheet

SMPS Controller

No Preview Available !

KA3842AC pdf
Internal Block Diagram
VREF 8
VFB 2
COMP 1
Internal
Bias
1/2 VREF
5V SET/
VREF RESET
Good LOGIC
UVLO
Error Amp
+
-
1/3
1V
C.S
Comp.
PWM
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
KA3842AC/KA3842AE Rev. 1.0.1
2
www.fairchildsemi.com


Part Number KA3842AC
Description SMPS Controller
Maker Fairchild Semiconductor
Total Page 6 Pages
PDF Download
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