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ML4821

Part Number	ML4821
Manufacturer	Micro Linear
Description	Power Factor Controller
Published	May 7, 2005
Detailed Description	May 1997 Micro Linear GENERAL DESCRIPTION The ML4821 provides complete control for a “boost” type power factor correcti...
Datasheet	ML4821 PDF File

Overview

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...

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