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LM2673-12产生负压不准确

我用的LM2673-12S芯片来产生-12V电压,输入为24V,上电后输出为-20V。同样的电路在另外一块板子上(我也是从原板学习来的)却是精确的-12V,想了很久也找不到原因,希一直调不出来,希望有人能回答下。