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[求助]TPS73HD301的28#管脚输出复位信号(低电平)

TPS73HD301的28#管脚输出复位信号(低电平),不知道什么原因!

5V输入是外部开关电源供电,供电很稳,其纹波噪声为80mV,但是TPS73HD301的28#脚输出低电平

3.3V和1.9V输出正常,没有任何问题。

电路图如下: