WS3220A

WS3220A Product Description WS3220A High Precision PSR Constant Current LED Driver Features ■ Built-in 650V Power MOSFET ■ ±5% LED Current Accuracy ■ Primary-side Sensing and Regulation Without TL431 and Opto-coupler ■ No Auxiliary Winding For Sensing And Supplying ■ Ultra low operating current ■ LED Open/Short Circuit Protection ■ CS Resistor Short Circuit Protection ■ VCC Clamp & under voltage lockout( UVLO) ■ Over Temperature Protection Applications ■ GU10 LED driver ■ LED spot light ■ Other LED lighting General Description WS3220A is a high precision primary-side feedback and regulation controller for LED lighting, it operates in constant current control mode and is designed to work in inductor current discontinuous conduction mode and especially suitable for flyback convertor under universal input. The output power of system is recommended to less than 5W. WS3220A integrates 650V power MOSFET. Since adopting primary sense and feedback control technology, the secondary sense and feedback circuit is eliminated. And it does not need the auxiliary winding for sensing the output current and supplying the chip. The low component counts and small system size are realized. Since using the high accurate current sense method, WS3220A realizes ±5% accuracy of LED current along with excellent line and load regulation. WS3220A offers comprehensive protection including Cycle-by-Cycle current limiting (OCP), LED open/short circuit protection, CS resistor short circuit protection, VC...