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TPS5430输出-12V的问题



我用的是21CN上的一个参考电路,输入12V,要得到输出-12V;

现在的情况是,输出在-12V和-18V之间来回跳动,不知道怎么解决?求大神指导,谢谢。

附件为原理图

Protel Schematic111.pdf