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LMR33620ADDA按照官方推荐电路无法输出所需电压

原始设计,按照WEBENCH上所给电路设计(如下图),得不到3.3V输出,

参考官方datasheet增加3个22uF Cout调整电感为6.8uH,PG接100k到VCC引脚,如下图,却得到稳定7.1V Vout。请问为什么会出现这种情况