UC3842A
Features
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- Low Start Current 0.2m A (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 UC3842A/UC3843A are fixed PWM controller for Off Line and DC to DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature pensated reference, high gain error amplifier, current sensing parator, and high current totem-pole output for driving a POWER MOSFET. Also UC3842A/ UC3843A provide low start up current below 0.3m A and short shutdown delay time typ. 100ns. The UC3842A has UVLO threshold of 16V(on) and 10V(off). The UC3843A is 8.4V(on) and 7.6V(off). The UC3842A and UC3843A can operate within 100% duty cycle.
8-DIP
8-SOP
Internal Block Diagram
7 VCC 29V
VREF 8
Internal Bias 1/2VREF
5V VREF
SET/ RESET UVLO
5 GND
Good LOGIC 7 PWR
VFB 2
Error Amp +
- C.S PWM...
