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Sure, I understand now, the entire converter can be treated as a small box, which is an operational amplifier + also LC filters in the converter at the output



In the sense that the system can become a generator despite the hidden feedback?




Could you show more information on this topic and how to choose the pk-pk value of the injection signal depending on the IC documentation? What to look for?

I found some information like that, I also added the scalak documentation


I found the open loop error amplifier gain and it is very high, which also explains why at low frequency the gain is high




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Regarding simulation

When there is 1 kHz in the simulation, it can be seen that the system is unstable, when I made a different frequency, it was visible that it is stable, so this shows that it probably has a small phase margin?


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