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UC3855A - High Performance Power Factor Preregulator

General Description

The UC3855A/B provides all the control

Key Features

  • Controls Boost PWM to Near Unity Power Factor.
  • Fixed Frequency Average Current Mode Control Minimizes Line Current Distortion.
  • Built-in Active Snubber (ZVT) allows Operation to 500kHz, improved EMI and Efficiency.
  • Inductor Current Synthesizer allows Single Current Transformer Current Sense for Improved Efficiency and Noise Margin.
  • Accurate Analog Multiplier with Line Compensator allows for Universal Input Voltage Operation.
  • High Bandwidth (5.

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Datasheet Details

Part number UC3855A
Manufacturer UNITRODE
File Size 1.28 MB
Description High Performance Power Factor Preregulator
Datasheet download datasheet UC3855A Datasheet

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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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High Performance Power Factor Preregulator application INFO available UC2855A/B UC3855A/B FEATURES • Controls Boost PWM to Near Unity Power Factor • Fixed Frequency Average Current Mode Control Minimizes Line Current Distortion • Built-in Active Snubber (ZVT) allows Operation to 500kHz, improved EMI and Efficiency • Inductor Current Synthesizer allows Single Current Transformer Current Sense for Improved Efficiency and Noise Margin • Accurate Analog Multiplier with Line Compensator allows for Universal Input Voltage Operation • High Bandwidth (5MHz), Low Offset Current Amplifier • Overvoltage and Overcurrent protection • Two UVLO Threshold Options • 150µA Startup Supply Current Typical • Precision 1% 7.