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UC3855B - High Performance Power Factor Preregulator

Download the UC3855B datasheet PDF. This datasheet also covers the UC3855A variant, as both devices belong to the same high performance power factor preregulator family and are provided as variant models within a single manufacturer datasheet.

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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (UC3855A-UNITRODE.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number UC3855B
Manufacturer UNITRODE
File Size 1.28 MB
Description High Performance Power Factor Preregulator
Datasheet download datasheet UC3855B Datasheet

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Other Datasheets by UNITRODE

Part Number Description
UC3855A High Performance Power Factor Preregulator
UC3851 PWM Controller
UC3852 High Power-Factor Preregulator
UC3853 High Power Factor Preregulator
UC3854A Enhanced High Power Factor Preregulator

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
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.