UC3842 Datasheet – Current Mode Controller

Part Number : UC3842, UC3842A

Function : High Performance Current Mode Controller

Package :  DIP 8 Pin, SOIC 14 Type

Manufacturers : ON Semiconductor, TI


UC3842 PWM Controller

Description :

The UC3842, UC3842A, UC3843A series of high performance fixed frequency current mode controllers are specifically designed for off−line and DC−to−DC converter applications offering the designer a cost effective solution with minimal 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 totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle−by−cycle current limiting, programmable output deadtime, and a latch for single pulse metering.



UC3842 datasheet pinout



1. Trimmed Oscillator Discharge Current for Precise Duty Cycle Control
2. Current Mode Operation to 500 kHz
3. Automatic Feed Forward Compensation
4. Latching PWM for Cycle−By−Cycle Current Limiting
5. Internally Trimmed Reference with Undervoltage Lockout
6. High Current Totem Pole Output
7. Undervoltage Lockout with Hysteresis
8. Low Startup and Operating Current

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UC3842 Datasheet PDF Download