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UC3842A - SMPS Controller

Download the UC3842A datasheet PDF. This datasheet also covers the UC3843A variant, as both devices belong to the same smps controller family and are provided as variant models within a single manufacturer datasheet.

Description

The UC3842A/UC3843A are fixed PWM controller for OffLine and DC to DC converter applications.

Features

  • Low Start Current 0.2mA (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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (UC3843A_FairchildSemiconductor.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by Fairchild (onsemi)

Part Number Description
UC3843 SMPS Controller
UC3843A 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.

View original datasheet text
www.fairchildsemi.com UC3842A/UC3843A SMPS Controller Features • • • • • • • Low Start Current 0.2mA (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 OffLine 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 UC3842A/ UC3843A provide low start up current below 0.3mA and short shutdown delay time typ. 100ns. The UC3842A has UVLO threshold of 16V(on) and 10V(off).
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