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我需要测试误差放大器的开环增益，闭合了继电器5,7,23,25。在DVI1，DVI2施加10V电压箝位10MA，QVI1上加-1.5V和-4V电压箝位1MA，QVi2加2V箝位1MA，COMP脚电压为梯形，梯形面积QVI1改变而改变，MP3为正反的满偏。是我的芯片坏了吗？还是说本来就该这样
求救，我需要测试的芯片是UCC2808ad-2的误差放大器开环增益。闭合继电器5,7,23,25，通过MP3测得电压求得开环增益，QVI2F上加2V，在QVI1F上分别加-1.5和-4v电压时，comp脚检测到的电压是一个梯形，mp3上是正反向的满偏随QVI1改变而改变。是芯片坏了，还是别的什么原因？
