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WS3240 Datasheet(PDF) 5 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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WS3240 Datasheet(HTML) 5 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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5 / 8 page  WS3240 ProductDescription WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299 5/8 Application Information WS3240 is a constant current driver for LED lighting, adopted advanced constant current control method.It integrates 650V power switch. Only need a few peripheral components can achieve excellent constant current characteristic. With the primary side feedback technology, WS3240 do not need optocoupler and TL431, also need not the auxiliary winding for power supply and detection. Thus achieve the low systemcost. Low operation current The operating current of WS3240 is very low. The typical value is 150uA. The low operating current improves the efficiency of the system, while reducing the VDD capacitor requirements. Primary Feedback PSR Technology Assume that the system works in DCM flyback mode, the power transmission equations can be expressed o o s pk m I V f I L P 2 2 Where, P is the output power, Vo and Io is the system output voltage and current, η is the system power conversion efficiency, Ipk is the primary side peak current, fixed 185mA. In DCM mode, Demagnetization time Tdem can be expressed as: pk p s dem m o I N N T L V Where, Np and Ns is the transformer primary and secondary turns, respectively. Combination of the above two formula, the average output current can be expressed as: dem s s p pk o T f N N I I 2 s dem s p pk o T T N N I I 2 Where Ts is the switch cycle. WS3240 adopts PFM mode to realize constant current, making the peak inductor current of primary side constant, also remains the ratio of the demagnetization time and the cycle time, which can realize constant output current, but also independent with the line input voltage and transformer inductance. The ratio of the demagnetization time and the cycle time is 0.5: 5 . 0 s dem T T Single Chip Built-in 650V High Voltage Power Supply, Start time less than 100ms Fig.1 shows the internal high voltage power supply module. When the system access AC power, VDD capacitor is charged by the internal 650V high voltage MOS. It will not reset and start working until the VDD voltage reaches 5.8V. The start time is less than 100ms, which means that the light achieves instant bright. In normal operation, VDD is dynamically charged by Drain, which can save the power supply auxiliary Winding. Demagnetization Detection WS3240 detects the demagnetization time through the drainterminal waveform, which can save auxiliary winding. Cycle by Cycle Current Protection and Lead Edge Blanking Cycle-by-cycle current limiting is offered in WS3240. An internal leading edge blanking circuit chops off the sense |
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