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zll中关于pwm波形的问题,为什么pwm值为0时仍然有波形存在,而不是一条直线

zll中pwm通道调光时,为什么给pwm值为0 时,仍然有波形存在?

我在实际的应用中,需要给出pwm值为0 时,是一条低电平的直线,我应该怎么做呢?

希望TI的工程师帮我解答下!谢谢