NCP1681 - Totem Pole Power Factor Correction Controller

onsemi

General Description

Combined OVP/OTP fault pin.

tions.

Key Features

Totem Pole PFC Topology Eliminates Input Diode Bridge Enabling Very High Efficiency & Compact Design.
AC Line Monitoring Circuit & AC Phase Detection.
Brownout Detection.
Digital Loop Compensation.
Novel Current Sensing Scheme Providing Inductor Current Upslope and Downslope Sensing.
PFCOK Indicator.
Skip/Standby Mode for Optimizing Light Load Performance.
Near.
Unity Power Factor in All Operating Modes Multi.

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NCP1681 totem pole power factor correction controller by onsemi - Datasheet Preview

Datasheet Details

Part number	NCP1681
Manufacturer	onsemi
File Size	2.17 MB
Description	Totem Pole Power Factor Correction Controller
Datasheet	NCP1681 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 Totem Pole Power Factor Correction Controller NCP1681 The NCP1681 is an innovative Multi−Mode (MM) and Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller IC designed to drive the bridgeless totem pole PFC topology. The bridgeless totem pole PFC consists of two totem pole legs: a fast− switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in efficiency and power density. The NCP1681 is available as a Fixed Frequency (NCP1681Ax) or Multi−Mode (NCP1681Bx) device.