深圳市华钻电子有限公司

SY5810*LED照明方案

General Description

The SY5810 is a single stage Flyback and 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 converter in constant

on time operation to achieve high power factor.

Features

·Primary side control eliminates the opto-coupler.

·Valley turn-on of the primary MOSFET to achieve

low switching losses

·0.3V primary 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

Applications

·LED lighting

·Down light

·Tube lamp

·PAR lamp

·Bulb

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