[SOLVED] [moved] PI Controller for DC-DC Converter

Hello folks,
I am working on dc-dc converter. I have a basic doubt about controller design. I have observed that mostly PI controller is used in dc-dc converter . My question is, why? I mean there are so many controllers but why people go with PI ?

PI is what you get from having the basic integrating opamp (error amplifier) setup, which is about the simplest way to do it.
Here in ltspice sim I show you PI controller for current mode smps...as you see its broken down into parts...and you see there is not really an easier way to do it....you see the error amp, its so simple and gives you nice PI control

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of course, as you know, the best book to actually tell what is PI control , in simple terms but very effective, is the first 50 pages of the book Electronics control by Owen Bishop....(that might not be the actual exact title of the book)

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Aaah ..here is the book
https://www.amazon.co.uk/Understand-Electronic-Control-Systems-Bishop/dp/0750646012

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Dare I say
Owen Bishops literature is of such high quality, that when you read stuff by Owen Bishop, you realise just how many of the other technical authors are either writing with the deliberate intent to confuse people and put the people off their subject because they want the knowledge all to themselves, or perhaps writing just out of pure vanity.
(of course Include Ray Ridley in the quality literature arena)

Hey, thanks for the reply. I have been following Ray Ridley's Power Supply Design Center though never used Owen Bishop book. I will go through it.

Because it can be built easily with an op amp and a few passive components, is easily integrated into control ICs, is simple to analyze and design, and is adequate for most purposes. Not sure what else you could ask for, unless of course you have some unique need or application.

PI have good response time and very small error is steady state. Parameter choosed for P and I components will modify response time, overshoot and error.