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Compensators Using OpAmp

Dear Team,

I was going through this document "Demystifying Type II and Type III Compensators Using OpAmp and OTA for DC/DC Converters"(https://www.ti.com/lit/an/slva662/slva662.pdf?ts=1591891093941&ref_url=https%253A%252F%252Fwww.google.com%252F).

While finding the transfer function of compensators,I can see that Vref(Connected to non inverting pin of Opamp) is not considered anywhere.

May I know why.

Regards

Hari