在看电源芯片规格书时，你会发现有一些电源芯片有PG管脚。如下ti.com.cn/product/cn/tps56637?qgpn=tps56637规格书所示：

        对应的描述是：Open Drain Power Good Indicator, it is asserted low if output voltage is out of PG threshold due to over-voltage, under-voltage, thermal shutdown, EN shutdown or during soft-start. 开漏管脚，电源输出正常的指示管脚，如果发生过压、欠压、热关断、EN 关