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LMZ14203: 关于使能端的理解阐述

Part Number: LMZ14203

1:这个en的这一端接入负电压那一侧与直接接地有什么区别?

2:正电压是与1.2V的基准电源作比较,负电压由于是芯片的GND接入负压输出端,所以是1.2V的基准源与负电压串联,实际上就是(-5+1.2V)。是这样理解的?