NCL2801 - High-Efficiency Power Factor Controller

onsemi

Key Features

necessary for robust and compact PFC stages, with few external components. General Features.
Near.
Unity Power Factor.
Critical Conduction Mode (CrM).
Valley Count Frequency Fold.
Back (VCFF).
Peak Current Control Mode to Maintain a Proper Current Shaping in VCFF Mode.
Fast Line / Load Transient Compensation (Dynamic Response Enhancer) Option.
Brown.
out Detection.
Two.
level Line Feed.
Forward (HL&.

NCL2801 high-efficiency power factor controller by onsemi - Datasheet Preview

Datasheet Details

Part number	NCL2801
Manufacturer	onsemi
File Size	421.54 KB
Description	High-Efficiency Power Factor Controller
Datasheet	NCL2801 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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DATA SHEET www.onsemi.com Power Factor Controller, High-Efficiency, Enhanced for Lighting 8 1 SOIC−8 CASE 751 NCL2801 The 8−pin PFC controller NCL2801 is designed to drive PFC boost stages. It is based on an innovative Valley Count Frequency Fold−back (VCFF) method. The circuit classically operates in Critical conduction Mode (CrM) for high load values. When the load decreases a Discontinuous Conduction Mode DCM is forced by forcing a dead time which, by construction corresponds to a fixed number of valleys. The lower the output power, the higher the number of valleys corresponding to the dead time. After DCM works down to 6th valley switching and if the load continues to decrease, a dead time is continuously added to the 6th valley.