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TPS54J061: BUCK输出电压不对

Part Number: TPS54J061


在应用时TPS54J061的输出电压不按规格书中给出的计算公司输出电压;初步判断VREF为2.0V;但是VREF应该是0.6V;请问这个是什么原因?

电路图如下所示,按照RFB的公式计算,如下电路图的输出电压应该是0.8V,但是现在输出的却是2.8V,VFB引脚的电压也变为了2.0V。