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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

  • s s s s s s s s s 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.
  • Some Packages Are O.

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Datasheet Details

Part number ML4821
Manufacturer Micro Linear
File Size 177.31 KB
Description Power Factor Controller
Datasheet download datasheet ML4821 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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May 1997 Micro Linear 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. The circuit includes a precision reference, gain modulator, average current error amplifier, output error amplifier, over-voltage protection comparator, shutdown logic, as well as a high current output. In addition, start-up is simplified by an under-voltage lockout circuit. In a typical application, the ML4821 controls the AC input current by adjusting the pulse width of the output MOSFET. This modulates the line current so that its shape conforms to the shape of the input voltage.