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控制多LED的功率和成本eng
黄桂强
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The traditional way to control the output of multiple LEDs is to dedicate a pulse width modulation （PWM） controller to each LED and use the controller to transform the input voltage to a current that supplies the LED. Often voltage controlled PWM controllers are used for this purpose. A current sense resistor is placed in series with the LED that feeds a voltage back to the controller. In essence， the controller is operating in a voltage mode holding the sample voltage constant， thereby， maintaining a constant current. This typical arrangement is shown in Figure 1.
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