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WS9221 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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WS9221 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 8 page  WS9221ProductDescription WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS Copyright@WinsemiMicroelectronics Co.,Ltd.,All rightreserved 1117 Features Built-in650V Power MOSFET Constant current control without secondary sense and feedback circuit. No Auxiliary winding for sensing and supplying Ultra low operating current to improve efficiency Universal input voltage ±5% LED current accuracy LED short and open circuit protection CS resistor short circuit protection VCC under-voltage protection Over temperature protection Available in SOP-7 package Applications GU10/E27 LED bulb, spot light Other LED lighting Description The WS9221 is a high precision primary-side feedback and regulation controller for LED lighting, it operates in constant current control mode and is designed to work in inductor current discontinuous conduction mode and especially suitable for flyback convertor under universal input. The output power of system is recommended to less than 5W. The WS9221integrates 650V power MOSFET. Since adopting primary sense and feedback control technology, the secondary sense and feedback circuit is eliminated. The loop compensation components are also removed while maintaining stability overall operating conditions. The operating current is very low, and it doesn’t need the auxiliary winding for sensing the output current and supplying the chip. The low component counts and small system size arerealized. Since using the proprietary high accurate current sense method, theWS9221 realizes ±5% accuracy of LED current along with excellent line and load regulation. The WS9221 offers rich protection functions including LED open/short circuit protection, CS resistor short circuit protection, over-temperature protection, VCC under voltage protection. Typical Application High Precision PSR Constant Current LED Driver |
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