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BQ4050: 外围供电电路BAT 引 脚通过一个二极管接到电池顶端B+,二极管作用是什么?

Part Number: BQ4050


指导手册上说:二极管的作用是当电池发生短路、过流等事件时,即使电池电压B+被瞬间脉冲拉低,也不至于把电量计BAT 引脚电压拉低。

我还是不太理解,B+被拉低后,二极管作用不应该是使BAT引脚成为高阻态吗?  那为什么选用BAT54HT1G(肖特基?),普通整流二极管可以吗?