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WS3440 Datasheet(PDF) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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WS3440 Datasheet(HTML) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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1 / 8 page  Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. W/T-Y027-Rev.A/1 May.2014 WS3440 Product Description WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS 0813 Features Features Features Features � Inductor Current Critical Mode, No Need to Compensate the Inductance Variation � Source Driver Structure, Not Need the Auxiliary Winding for VCC � ±3% LED Current Accuracy � Up to 93% System Efficiency � LED Short Circuit Protection � Current Sense Resistor Short Circuit Protection � Over Temperature Protection � Programmable LED open protection Applications Applications Applications Applications � LED Bulb � LED Candle light � LED Spot light � Decorative LED lighting General General General General Description Description Description Description The WS3440 is a high precision constant current controller， designed for non-isolated buck LED driver. suitable for AC input voltage range (84V-264V) The WS3440 uses high precision current sense circuit and patent method for constant current control, to achieve high precision output current and excellent line regulation. The WS3440 operates in inductor current critical mode. The LED current is constant over wide range of inductance variation and the LED output voltage, so the load regulation is excellent. The WS3440 uses patent source driver architecture. The operation current is 200uA only, so the auxiliary winding is not needed. It can simplify the system design and reduce the system cost. The WS3440 offers rich protection functions, including LED open/short circuit protection, current sense resistor short circuit protection and over temperature protection. Typical Typical Typical Typical Application Application Application Application Circuit Circuit Circuit Circuit Constant Constant Constant Constant Current Current Current Current Controller Controller Controller Controller For For For For Non-isolated Non-isolated Non-isolated Non-isolated Buck Buck Buck Buck LED LED LED LED Driver Driver Driver Driver A C 1 2 3 6 5 4 R O V P G N D C S V C C G A T E S |
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