onsemi - NCP1680 Totem-Pole CRM Power Factor Correction Controller | Datasheet Preview

The onsemi NCP1680 is a Critical Conduction Mode power factor correction controller designed to drive the bridgeless totem-pole PFC topology. This power factor correction architecture consists of 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 the power stage efficiency. The NCP1680 features discontinuous conduction mode with valley turn on under a light load condition and a frequency foldback in discontinuous conduction mode with 25 kilohertz minimum frequency. Other features include a skip mode, a proprietary current sense scheme, digital voltage loop compensation, and an AC line monitoring circuit as well as AC phase detection. The NCP1680 PFC controller is ideal for power factor correction or as an offline power supply in industrial, telecom, networking, gaming console and computing applications.