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TPS2811: TPS2811 仿真 2OUT 输出不正常

Part Number: TPS2811

VDD=4V, GND接-8V,

1OUT 的输出能跟随1IN的波形进行反向,但是2OUT 的输出就是不正常。

1IN 和2IN的波形是一样的,0-3.3V的方波。请问是什么问题?

TPS2811 是官网下的Pspice 模型,通过TINA 导入的。