Single Stage Buck PFC Controller For LED Lighting

1.Chip Description

The SY5814A is a single stage Buck PFC controller targeting at LED lighting applications. It drives the Buck converter in the quasi-resonant mode to achieveThe SY5814A is a single stage Buck PFC controller targeting at LED lighting applications. It drives the Buck converter in the quasi-resonant mode to achievehigher efficiency. It keeps the Buck converter in constant on time operation to achieve high power factor.

2. Features

Valley turn-on of the MOSFET to achieve low switching losses
0.3V current sense reference voltage leads to a lower sense resistance thus a lower conduction loss.
Internal high current MOSFET driver: 0.25A sourcing and 0.5A sinking
Low start up current: 15µA typical
Reliable short LED and Open LED protection
Power factor >0.90 with single-stage conversion.
Compact package: SOT23-6 Compact package: SOT23-6