I have a question regarding the UCC1805 error amplifier. I am trying to run an analysis on a design which utilizes the UCC1805-EP. Currently we are having what I believe to be compensation problems. In an averaged model the compensator works as expected, but when plugged into a transient model using TI's pspice model the supply has a large constant error.
Digging into it I made a model to test the error amplifier in the spice model. I constructed a simple inverting amplifier using it and found the amplifier output in the model to be 180 out of phase relative to an ideal op-amp stimulated by the same source. In other words when configured as an inverting amplifier it acts like a non-inverting amplifier. It does not act anything like an op amp as the data sheet says. Is this representative of the real device? If so, how do you compensate it?