I would like to design a boost converter using LM3481 from texas instruments. To de the job, I have selected TINA TI circuit simulator, where the average model of LM3481 is given. So I have used this model to get the open loop bode plot of the power stage without the compensator.My objective is to get a plot that will help me to decide where to put poles and zeros of the compensator. The circuit is given bellow with (L=6uH, Rsense=20m, Fsw=227kHz)
My probleme is that I do not know how to built a circuit for AC simulation, for exmample, I do not know how to isolate the COMPENSATION PIN or where to connect it.
*If I connect it the compensator circuit, I will not get the open loop graphs, but I will get the closed ones, am I right ?
*If I connect it to the ground, I get a strange graphs that are not convinient to me.
What are the techniques that I should use to get the bode plot of the power stage without the compensator?