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现在对于PWM输入直接拉高和无PWM输入的情况，输出状态完全一致，就好像PWM输入没有起作用。除了IFSEL管脚外还有什么会影响PWM输入？
Hi
PWM输入占空比D方波，对应输出LED电流会因为占空比不同，而使得输出电流不同，此时输出电流为Iset*D
