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 DIP-7 Package

 

Structure Type		Part No.	MOS	Package	App. Watt		OVP	PDF
					176-264Vac	90-264Vac
Non-isolation	PF﹥0.5	WS3443	-	DIP7	160V/280mA	80V/380mA	External Set

 

The WS3443 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 WS3443 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 WS3443 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 WS3443 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 WS3443 is available in DIP-7 Package.