UC3843 Datasheet – SMPS Controller – Fairchild

Part Number : UC3843, UC3843N, UC3843D1, UC3843D

Description : SMPS Controller

Package : 8-DIP, 8-SOP, 14-SOP Type

Manufactures : Fairchild Semiconductor


UC3843 pinout datasheet


The UC3842 / UC3843 / UC3844 / UC3845 are fixed frequencycurrent-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and a high current totempole output for driving a Power MOSFET.




1. Low Start up Current

2. Maximum Duty Clamp

3. UVLO With Hysteresis

4. Operating Frequency up to 500KHz


Official Homepage : https://www.fairchildsemi.com/products/legacy/UC3843.html


UC3843 Datasheet

UC3843 pdf