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TPS5450的负压调试

按着数据手册上面的-5V负压想要改成-15V,3A输出可是焊接完出现了问题。一是不可调,二是输出才-1.22。请问FB的的值应该是怎么变的,可能是负数吗是不是因为我358没有接负压

不知道哪里出了大问题,希望得到帮助