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TPS62120供电电压不稳定

Other Parts Discussed in Thread: TPS62120

TI专家你们好,我想通过TPS62120稳压芯片将5V电压变成-5V,测试电路是按照TPS62120手册的经典参数搭建的。其中芯片采用直流电源供电,测试结果发现直流电源的输出电压被拉低而且不稳定,电流输出为0A(输出一直在变动,我只取了其中的三张)。我用万用表测得-Vout= -1.3V左右,这个到底是什么原因?

                                          

                                                                                              测试电路