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DRV8840上电直接进入限流保护

原理图如下,在两个OUT输出为了把PWM滤掉,加了一路LC电路,如下:

目前发现加上这个220uF的电容后,芯片就进入保护,去掉电容,输出正常。

还有就是上电后,给的占空比非常小,也是可以工作的。

感觉非常的奇怪。