Behavior Modeling Constant ON Time Buck (2)

Constant ON Time Buck Implementation (2)

Still, curious to know how its frequency response looks like.

Have to run POP to know the results.

I found it troublesome that I made the Simplis model too complicated. It just won't converge...

After lose some weight and just keep the power plant and major loop, It converged !!

This is not like we saw in TI's application note. It surly does so since I did not copy TI's circuit. 😊

In the model, I put a low bandwidth loop to lock the DC difference between FB and VREF while not affecting higher frequency range. And the early feed forward should put zeros into the loop. 

What I am not sure is in this model, only 20 degree phase lag around the loop!? But from the time domain response, it does indeed have good response.

I may need to derive the model some day...