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TLC59116输出为恒定直流,怎么理解它调光



请问TLC59116的16路输出是直流电流么?我用示波器看的是一个PWM波形?

还是输出是直流,只是PWM改变其电压,控制LED通断,通过改变其平均电流来控制灯的明暗?

急盼解答