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TPS54386的FB1,FB2电压没有达到0.8v会影响哪些部分?

您好:

      1、我使用54386给FGPA供电,输出3.3和1.2v,目前调试中发现FB1和FB2上的电压只有0.4v左右,但是手册中说明是在0.8v,请问什么可以导致该问题。

      2、Functional Block Diagram图中SW引脚有很多相连的点,请问这个点是什么关系  ‘与或非’?