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TPS61070与TL431级联使用

Other Parts Discussed in Thread: TPS61070, TLC3578, TL431, TPS62203, TPS54231, TPS6735

使用TPS61070将3.6V锂电转换为5v,采用TL431转化4V作为AD芯片TLC3578的基准元,可是在使用的时候,TPS61070会烧坏,输入电源引脚和地短路,取下61070,用万用表测量,发现SW引脚与地短路,输入电源引脚正常。在取掉原理图中R26后,接上电源,除AD外工作正常,原理图如下图所示: