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OPA365-Pspice模型,单电源供电与双电源供电,Ib仿真结果不一致

从TI官网下载的OPA365-Pspice模型,接成跟随器,仿真Ib电流。

1.使用±2.5V双电源供电,同相端接GND,反相端连接输出。仿真结果:Ib+=-401.156fA , Ib-=-401.681fA

2.使用+5V单电源供电,同相端接+2.5V,反相端连接输出。仿真结果:Ib+=4.5989pA , Ib-=4.5983pA

请TI工程师帮忙分析一下。