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TPS62125输出得到的不是负压,怎么办?

Other Parts Discussed in Thread: TPS62125

按照slva514b的datasheet做的TPS62125的反相降压芯片,为何最后得到的不是芯片的负压啊?是按照datasheet给的参考电路图啊,请教一下各位大神啊?已经调了一天了,拜托各位了!