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

 

Structure Type		Part No.	MOS	Package	App. Watt		OVP	PDF
					176-264Vac	90-264Vac
Non-isolation	PF﹥0.5	WS3442	-	SOP8	80V/280mA 120V/220mA	80V/220mA60V/300mA	External Set
				DIP8	120V/280mA 160V/220mA	80V/300mA

 

The WS3442 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 WS3442 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 WS3442 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 WS3442 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 WS3442 is available in SOP-8 Package and DIP-7 Package.