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TPS63700输出-5V不稳定

Other Parts Discussed in Thread: TPS63700

TPS63700,搭建负压产生电路,5.5V转-5V,上电以后电压正常,慢慢电压就变成-3.5V,直至到0V左右,期间电流慢慢变小,重新下电再上电没办法恢复,一直是电压在0V左右。电路是完全按照手册参数画的,不知道会有哪些原因导致这种情况,请指教,多谢。