NCP1927 Datasheet (ON Semiconductor) - Combination Power Factor Correction Controller and Flyback Controller

NCP1927, Combination Power Factor Correction Controller and Flyback Controller

Pin No.

1 2 Pin Name POVUV PFB Pin Description The gate drive is disabled while VPOVUV is below VUVP (300 mV typ) or above VOVP (2.5 V typ).

This pin receives a portion of the pre *converter output voltage.

This information is used for the regulation and the “output low” detection that speeds

NCP1927 Combination Power Factor Correction Controller and Flyback Controller for Flat Panel TVs This combination IC integrates the primary side control blocks power factor correction (PFC) and flyback controllers with sequencing circuitry necessary to implement a compact highly efficient Flat Panel TV Switched Mode Power Supply.

The PFC controller exhibits near unity power factor while operating in Critical Conduction Mode (CrM) with an internal frequency clamp.

The

NCP1927 Features

* necessary for building a robust and compact PFC stage while minimizing the number of external components. The fixed

* frequency current

* mode flyback controller features a proprietary Soft

* Skip™ mode combined with frequency foldback enabling excellent efficiency during light loa