SY58203A1

Applications Note:SY58203A1 Single Stage Flyback And PFC Regulator With Primary Side Control For LED Lighting General Description The SY58203A1 is a single stage Flyback and PFC regulator targeting at LED lighting applications. It integrates a 700V MOSFET to decrease physical volume. 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. Ordering Information SY58203□(□□)□ Temperature Code Package Code Optional Spec Code Ordering Number SY58203A1FAC Package type SO8 Note ---- Typical Applications Features Integrated 700V MOSFET Primary side control eliminate to 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. Low start up current: 15µA typical Reliable short LED and Open LED protection Power factor >0.90 with single-stage conversion. Maximum frequency limit: 120kHz Compact package: SO8 Applications LED lighting R commended operating output power P oducts 90~264Vac 176~264Vac SY58203A1 10W 17.5W AC input 90~264V DB1 D2 R2 C2 NP NS C1 R1 T1 R3 D3 NAUX R6 R9 D1 R5 C5 C7 R7 NC Drain VIN NC COMP Source ZCS GND SY58203A1 R8 C3 DC Output y( ) Figure 1. Schematic Diagr...