SMPS Controller
KA3842AC/KA3842AE SMPS Controller
March 2006
KA3842AC/KA3842AE SMPS Controller
Features
Low start current 0.2mA (Typ...
Description
KA3842AC/KA3842AE SMPS Controller
March 2006
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
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, temperature compensated reference, high gain error amplifier, 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 threshold 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
1
www.fairchildsemi.com
KA3842AC/KA3842AE Rev. 1.0.1
KA3842AC/KA3842AE SMPS Controller
Internal Block Diagram
7 VCC 29V VREF 8 Internal Bias 1/2 VREF Error Amp + C.S PWM Comp. LATCH 1/3 1V S COMP 1 T 5 PWR GND R 22V 6 OUTPUT 5V VREF SET/ RESET UVLO Good LOGIC 7 PWR VC 5 GND
VFB 2
C.S 3
RT/CT 4
OSCILLATOR
KA3842AC/KA3842AE Rev. 1.0.1
2
www.fairchildsemi.com
KA3842AC/KA3842AE SMPS Controller
Abs...
Similar Datasheet