WS9441P Datasheet, PDF (1/9 Pages) List of Unclassifed Manufacturers – Non-isolated BuckOffline LED Driver

WS9441P Product Description
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
 External PWM Dimming
Applications
 LED Bulb Lights
 LED Panel Lights
 LED Strings
Typical Application Circuit
Non-isolated BuckOffline LED Driver
Description
The WS9441P 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 WS9441P 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 WS9441P adopts intelligent temperature control and
thoroughly solves the problem of light flashing at high
temperatures. It integrates an external dimming pin which inputs
PWM signal and can dim by changing the duty cycle of the PWM
signal. The WS9441P 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 WS9441P is available in SOP-7 Package.
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