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TPS2116: 关于Vin1与Vin2无法正常切换的问题

Part Number: TPS2116

根据TPS2116的真值表设计了电路,我们期望当VIN1>1.5V时,VOUT输出VIN1,当VIN1<1.5V, VIN2>1.6V时,VOUT输出VIN2,

但是在实际测试中,VOUT一直与VIN1保持一致,在VIN1上的通断逻辑没问题,但是始终无法切换到VIN2。请问是什么原因?