NCP1680 Datasheet - ON Semiconductor

NCP1680 Totem Pole CrM Power Factor Correction Controller

Table 1. PIN DESCRIPTIONS Pin Number Pin Name Function 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 conditions. The pin becomes active when the PFC output achieves regulation in nominal operation, sou.

CrM Totem Pole PFC IC Totem Pole CrM Power Factor Correction Controller NCP1680 The NCP1680 is a Critical Conduction Mode (CrM) 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 circu.

NCP1680 Features

* Totem Pole PFC Topology Eliminates Input Diode Bridge Enabling Very High Efficiency & Compact Design

* AC Line Monitoring Circuit & AC Phase Detection

* Brownout Detection

* Critical Conduction Mode (CrM) Operation

* Discontinuous Conduction Mode (DCM) with

NCP1680-ONSemiconductor.pdf