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TPS61041: 输入输出电压均正常,反馈电压偏高

Part Number: TPS61041

电路见上图,输入5V,输出22.7V,测量时发现反馈脚电压为1.3V左右,与IC手册的1.233V不符,

这个电路与数据手册的电路差别不大,没有发现哪里会引起这个原因,求解答。