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UC3843 - SMPS Controller

General Description

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.

Key Features

  • Low Start up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency up to 500KHz.

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Other Datasheets by Fairchild (now onsemi)

Part Number Description
UC3843A SMPS Controller
UC3842A SMPS Controller
UC3844 SMPS Controller
UC3844D SMPS Controller
UC3844D1 SMPS Controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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www.DataSheet4U.com www.fairchildsemi.com UC3842/UC3843/UC3844/UC3845 SMPS Controller Features • • • • Low Start up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency up to 500KHz Description 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. The UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off). The UC3843 and UC3845 are 8.5V(on) and 7.9V (off).