矽力杰内置MOS恒流驱动方案，美国矽力杰，SY58203，SY58294，General Description

　　The SY58203 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.

　　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 lowerconduction 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

　　SY58294

　　General Description

　　The SY58294 is a 15W single stage Buck PFC controller targeting at LED lighting applications. It integrates a 500V MOSFET to decrease physical volume. It adopts the proprietary control architecture to achieve an accurate regulation of LED current, unity power factor, and quasi-resonant valley turn-on high efficiency operation.

　　It integrates open/short LED protection and eliminates the need for opto-coupler, thus minimizing the component count and board size.

　　Features

　　* Integrated 500V MOSFET

　　* 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

　　* Low start up current: 15μA typical

　　* Reliable short LED and Open LED protection

　　* Power factor >0.90 with single-stage conversion.

　　*Maximum frequency limit: 200kHz

　　*Compact package: SO8