一块板子上使用三块TPS54620，分别输出1.8V,1.2V和3.3V，前面两路输出正常，后面3.3V实际输出只有0.6V左右。换了新的电源芯片也是一样的现象。电路布局都是一样的。VSEN引脚测出来只有0.4V左右。
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