SY5810应用文档.pdf

Applications Note: SY5810 Single Stage Flyback And PFC Controller With Primary Side Control For LED Lighting Preliminary datasheet General Description Features The SY5810 is a single stage Flyback and PFC • Primary side control eliminates the opto-coupler. controller targeting at LED lighting applications. It is a • Valley turn-on of the primary MOSFET to achieve primary side controller without applying any secondary low switching losses feedback circuit for low cost, and drives the Flyback • 0.3V primary current sense reference voltage leads converter in the quasi-resonant mode to achieve higher to a lower sense resistance thus a lower conduction efficiency. It keeps the Flyback converter in constant loss. on time operation to achieve high power factor. • Internal high current MOSFET driver: 0.25A sourcing and 0.5A sinking Ordering Information • Low start up current: 15µA typical SY5810SY5810 (( )) • Reliable short LED and Open LED protection □□□□□□□□□□□□□□□□ □□□□□□□□□□□□□□□□ Temperature CodeTemperature Code • Power factor 0.90 with single-stage conversion. Package Code