WS3441A

WS3441A ProductDescription Features  Critical Conduction Mode Operation  Internal 500V Power MOSFET  No Auxiliary Winding  Ultra Low Operating Current  ±3% LED Output Current Accuracy  Efficiency up to 93%  LED Open Protection  LED Short Protection  Current Sensing Resistor Short Protection  Thermal Regulation Function  Available in SOP-8 Package Applications  LED Candle Light  LED Bulb, Spot Light  T8/T10 LED String  Other LED Lighting Typical Application Non-isolated Buck Offline LED Driver Description The WS3441A is a high precision buck constant current LED driver. The device operates in critical conduction mode and is suitable for 85Vac~265Vac universal input offline LED lighting. The WS3441A integrates a 500V power MOSFET. The operating current of the IC is very low. So it doesn’t need the auxiliary winding for supplying the chip. It can achieve excellent constant current performance with very few external components, so the system cost and size are minimized. The WS3441A utilizes patent pending current control method. It can achieve precise output current and excellent line regulation. The driver operates in critical conduction mode, the output current does not change with the inductance and LED output voltage. The WS3441A offers rich protection functions to improve the system reliability, including LED open circuit protection, LED short circuit protection, VCC under voltage protection, CS resistor short circuit protection and thermal regulation functio...