NCP1681 Datasheet - ON Semiconductor

NCP1681 Totem Pole Power Factor Correction Controller

Pin Number Pin Name Pin Description 1 FAULT Combined OVP/OTP fault pin. 2 PFCOK The PFCOK pin is held low when the PFC output voltage is out of regulation and during fault condi- tions. The pin becomes active when the PFC output achieves regulation in nominal operation, sourc- ing a curr.

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 brid.

NCP1681 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

NCP1681-ONSemiconductor.pdf