WS3443 Datasheet, PDF (1/8 Pages) List of Unclassifed Manufacturers – Non-isolated Buck Offline LED Driver

WS3443 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 DIP-7 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 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.
Attention：A 22pF capacitor can be parallel with Rovp and a resistor can be parallel with the Vcc capacitor.
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