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UC3854 - ENHANCED HIGH POWER FACTOR PREREGULATOR

General Description

The UTC UC3854 provide all the functions necessary for active power factor corrected preregulators.

The controller achieves near unity power factor by shaping the AC input line current waveform to correspond to that of AC input line voltage.

Key Features

  • Controls Boost Preregulator to Near Unity Power Factor.
  • Limits Line Distortion.
  • World-Wide Line Operation.
  • Accurate Power Limiting.
  • Fixed Frequency Average Current Mode Control.
  • High Bandwidth (5MHz), Low Offset Current Amplifier.
  • Integrated Current and Voltage Amp Output Clamps.
  • Multiplier Improvements: Linearity, 500mV VAC Offset (eliminates external resistor), 0-5V Multout Common Mode Range.
  • VREF "GOOD" Comparator.
  • Faster and Improved Accurac.

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📁 Similar 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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UNISONIC TECHNOLOGIES CO., LTD UC3854 Advance ENHANCED HIGH POWER FACTOR PREREGULATOR  DESCRIPTION The UTC UC3854 provide all the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor by shaping the AC input line current waveform to correspond to that of AC input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control. Designed in UTC’s Bipolar process, the UTC UC3854 offers new features such as wide bandwidth, low offset Current Amplifier, a faster responding and improved accuracy enable comparator, a VREF "good" comparator, UVLO threshold options (16/10V for offline, 10.