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TPS54560的EN管脚应如何处理

Other Parts Discussed in Thread: TPS54560

TPS54560手册上说EN内部已经上拉,在需要更高欠压保护的应用中需要外部上拉,请问怎么判断EN管脚是该悬空还是该外部上拉?为什么在WEBENCH导出的设计文件中,原理图EN是悬空的而PCB的EN是外部上拉的?