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LM5575 12V转-15V

如图所示的12V转-15V电路,无法正常工作,输出电压不稳定(-28V左右吧),FB比输出电压高1.6V,也超出了手册数值1.225V,Vcc比输出电压高7.8V,Comp电压为5.6V(相对于输出电压),不等于FB。问题出在哪?