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WS9822B Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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1 / 11 page Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. WS9822B Product Description WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 0121 Features Three-stage switcher dimming: 100%-40%-15% Compatible PCB with WS3442 Internal 500V Power MOSFET Critical Conduction Mode Operation ± 3% LED Current Accuracy without Auxiliary Winding for power supplying Efficiency up to 93% LED Open and Short Circuit Protection Thermal Regulation Function to avoid lights flicking under high temperature. Typical Applictions T5/T8 LED Strings Ceiling Lamps Bulbs Other LED Lightings Typical Application Circuit Description The WS9822B is a three-stage dimming constant current LED driver with high precision and is applied to non-isolated buck LED power system. The WS9822B integrates a switch dimming circuit and can change the output current through switch shifting. The device operates in critical conduction mode and is suitable for universal input offline LED lighting to dim with three-stage by switcher. The WS9822B utilizes proprietary current control method. It can achieve precise LED output current and excellent line regulation. The operating current of the IC is as low as 120uA. So it doesn’t need the auxiliary winding for supplying the chip, which brings more simplified designs and lower cost. The WS9822B adopts intelligent temperature control and thoroughly solves the problem of LED flickering under high temperature. The WS9822B offers multiple protection functions to improve the system reliability, including LED open circuit protection, LED short circuit protection, and VCC under voltage protection. Non-isolated Buck High Precision Three-stage Dimming LED Driver |
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