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TLE4275-Q1, 20pinHTSSOP封装的电源芯片搭建的电源模块疑问

您好!最近我们在测试时发现,上图中的TLE4275,KL30A在不加24V电的情况下,给VCC端加3.3V时,POWER端此时也测得是3.3V?为什么?谢谢!