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LMZ12003EXT 断电反灌电压

Other Parts Discussed in Thread: LMZ12003EXT

如图电路,当VIN不供电时,从VCC+5V_FIRST有其他设备供电(5V),此时在VIN接口测得电压6v,
不想在VIN口测得6V电压,没供电就应该显示0V,不在5V主干路上串二极管的话,有没有其他解决办法。还是这个就是正常现象呢?