I am working on a hysteretic buck regulator. I know this topology is
always stable. But I have a question about the open loop gain of this
topology. Since the comparator is a non-linear circuit and I do not know
how to use linear model to represent this block. I just got a feeling that
the loop gain is not very high.

Does anybody know how to calculate the loop gain of this topology? Could you provide some document? Thank you very much!