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OPA860: opa860的第8脚出现奇怪的现象

Part Number: OPA860


从官网下载了opa860的Pspice模型,仿真峰值保持电路看到了正确的仿真波形,orcad pspice显示第8脚的输出电压为-42v,但在电路板上用万用表实际测得第8脚的输出电压为5v,整个芯片的供电是正负5v,这种现象怎么解释?