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关于 LDO TPS73250DBV输出电压不正常的问题。

大家好,试了5个TPS73250DBV芯片,只有一个芯片能正常输出5.0V,其他都是输出的输入电压,输入电压为5.4V和5.35V,这是什么原因啊,难道是买到假货了吗。。。