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TPS62175 电压逐渐升高的问题



之前焊过3块板子,芯片输出5V正常,但是最近焊了一块,发现电压输出有点问题,不能稳定在5V,供20V时输出已经在5.7V左右,而且可以观察到电压在逐渐上升,请问是可能的原因是什么呢?附上原理图