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TPS4800-Q1: TPS4800-Q1 反极性保护

Part Number: TPS4800-Q1

规格书中和demo板中提到了TPS4800-Q支持反极性保护功能,但我将输入口反接且不加负载情况下,会有大电流且输入口电源电压会拉低。请问这是为什么呢?原理图见下图:

17.png

期待您的回复。thanks