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ML4821 - Power Factor Controller

General Description

The ML4821 provides complete control for a “boost” type power factor correction system using the average current sensing method.

Special care has been taken in the design of the ML4821 to increase system noise immunity.

Key Features

  • Average current sensing for lowest possible harmonic distortion.
  • Average line compensation with brown-out control.
  • Precision buffered 5V reference.
  • 1A peak current totem-pole output drive.
  • Overvoltage comparator eliminates output “runaway” due to load removal.
  • Wide common mode range in current sense comparators for better noise immunity.
  • Large oscillator amplitude for better noise immunity.
  • Output driver internally limited.

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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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www.fairchildsemi.com ML4821 Power Factor Controller Features • Average current sensing for lowest possible harmonic distortion • Average line compensation with brown-out control • Precision buffered 5V reference • 1A peak current totem-pole output drive • Overvoltage comparator eliminates output “runaway” due to load removal • Wide common mode range in current sense comparators for better noise immunity • Large oscillator amplitude for better noise immunity • Output driver internally limited to 17V • “Sleep mode” shutdown input General Description The ML4821 provides complete control for a “boost” type power factor correction system using the average current sensing method. Special care has been taken in the design of the ML4821 to increase system noise immunity.