WINSEMI MICROELECTRONICS

WINSEMI MICROELECTRONICS

WINSEMI MICROELECTRONICS

WINSEMI MICROELECTRONICS

WINSEMI MICROELECTRONICS

Copyright@WinsemiMicroelectronics Co.,Ltd.,All rightreserved

1105

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 DIP-7 Package

Applications



LED Candle Light



LED Bulb, Spot Light



T8/T10 LED String



Other LED Lighting

Description

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.

Typical Application

Attention：A 22pF capacitor can be parallel with Rovp and a resistor can be parallel with the Vcc capacitor.

Non-isolated Buck Offline LED Driver