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TPS56221输出电压问题

按照datasheet搭建电路,设计输出电压为1V,但是上电后输出电压为0.52V

经测量,V(FB)=0.32V,而不是手册描述的0.6V,没找到问题出在哪?

(当前电源输出无负载)

请大侠指教!