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WS9441

Applications
LED Bulb Lights
LED Panel Lights
LED Strings

Features
Critical Conduction Mode Operation
Internal 500V Power MOSFET
Gate Drive and No Auxiliary Winding
±3% LED Current Accuracy
Efficiency up to 93%
LED Short Circuit Protection
LED Open Circuit Protection
Current Sense Resistor Short Protection
Thermal Regulation Function
 

Structure Type

Part No.

MOS

Package

App. Watt

OVP

PDF

176-264Vac

90-264Vac

Non-isolation

PF0.5

WS9441

1A/500V

SOP7

80V/220mA

80V/150mA

External Set

WS9441.pdf

 

150V/150mA

 

Description
The WS9441 is a high precision buck constant current LED driver and is applied to non-isolated buck LED power system with
AC input voltage of 85VAC-265VAC. The WS9441 integrates a 500V power MOSFET, and can achieve excellent constant current
performance with very few external components, so the system cost and size are minimized. The driver operates in critical
conduction mode, and the output current does not change with the inductance and LED output voltage. The operating current of the
IC is 200uA, so it doesn’t need the auxiliary winding for supplying the chip, thus simplifying design and reducing cost.
The WS9441 adopts intelligent temperature control and thoroughly solves the problem of light flashing at high temperatures. The WS9441 offers full protection functions to improve the system reliability, including LED open circuit protection, LED short circuit protection, CS resistor short circuit protection and thermal regulation function.
The WS9441 is available in SOP-7 Package.
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Return Policy

30 Days Service

Solution & Support

Call +86-755-8418 2951