KA3842A Datasheet PDF – SMPS Controller – Fairchild

Part Number: KA3842A


Package: DIP 8 Pin Type

Manufacturer: Fairchild Semiconductor , ON Semicondcutor

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KA3842A datasheet

Obsolete as of 14-Sep-2013


The KA3842A / KA3842AC / KA3842AE 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 KA3842AC / KA3842AE provides low start up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3842AC / KA3842AE has UVLO threshold of 16V(on) and 10V(off). The KA3842AC/KA3842AE can operate within 100% duty cycle.

Block Diagram :

KA3842A pinout diagram


1. Low Start Current 0.2mA (Typ)

2. Operating Range up to 500kHz

3. Cycle by Cycle Current Limiting

4. Under Voltage Lock Out With Hysteresis

5. Short Shutdown Delay Time: Typ.100ns

6. High Current Totem-Pole Output

7. Output Swing Limiting: 22V


KA3842A Datasheet

KA3842A pdf


Other data sheets are available within the file: KA3842AC, KA3842AE