SY5839 Datasheet (Silergy) - Single Stage Buck PFC Controller

SY5839, Single Stage Buck PFC Controller

The SY5839 is a single stage Buck PFC controller targeting at LED lighting applications.

It is a primary side controller without applying any secondary feedback circuit for low cost, and drives the Flyback converter in the quasi-resonant mode to achieve higher efficiency.

It keeps the Flyback conver

SY5839 Features

* Valley turn-on of the MOSFET to achieve low switching losses

* Power factor >0.90 with single-stage conversion.

* Low start up current: 15µ A typical

* Quick start up