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 and DIP-7 Package

Description
The WS3441 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 WS3441 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 WS3441 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 WS3441 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 function.
The WS3441 is available in SOP-8 Package and DIP-7 Package.