Here is some information for you:
https://books.google.co.uk/books?id=XE0vBQAAQBAJ&pg=PA1&lpg=PA1&dq=switch+mode+power+supply+basics&source=bl&ots=hZJz_wOy9f&sig=aq0rhOIn6Z87aZxLc3RuMkVvJcc&hl=en&sa=X&ved=0ahUKEwiT-Z3ms-3RAhWGOsAKHR31AzI4ZBDoAQg1MAU#v=onepage&q=switch mode power supply basics&f=false
http://slot-tech.com/interesting_stuff/a collection of technical stuff from a technician in Libya/Practical_Switching_Power_Supply_Design.pdf
Wow, looks like you really covered the bases there spec.
And to think i was going to say, "look online"
Switch mode power supplies are a devil to understand, and there does not seem to be one book that covers the basics thru to a high level. Often the best way to grasp a difficult subject is to read about it described from different angles and pick out the bits that gel- the scatter gun approach.
I hope all the data does not overwhelm the OP who does not seem to have had much luck with the same question on other sites.
One of the problems is that there does not seem to be one book that goes from the basics of switch mode power supplies thru to a high level, so it seemed best to let the OP do what I do in such cases and mix and match from various sources.
Thanks- I did get your meaning.Yes some good points, and just to be clear, i was commending you on the thoroughness of your answer.
That is a good observation- buck converters are the simplest to understand and probably the easiest to design as well.I would also like to add that my recommendation for someone who never looked into switching type converters would be that they should start with the buck (step down) converter as they are the easiest to understand out of the whole bunch.