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WS9441P Datasheet(PDF) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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WS9441P Datasheet(HTML) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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1 / 9 page  Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WS9441P Product Description WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 0318 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 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. Typical Application Circuit Non-isolated BuckOffline LED Driver |
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