输入电压为2.6v左右时,输入电流已经达到了0.5a,在此情况下,Vref=-1.15v,FBN=-1.21V,FBP=0.268V,VNEG=-2.42V,VPOS=2.34,而OUTN的本应该是与地相接输出零电压,却是一个从-3v到2v的不断跳变的波形,引起整个电路板地电位不断跳板
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TPS65131 的输入电压范围是2.7V 到5.5V, 如果输入电压过低,可能会出现工作异常,另外,OUTN不是与地相连接的,应该串一个电感连接到地,这样才能连成一个buck-boost电路,产生负压输出.