is there ny1 can guide me about the inductor working in detail? y we need that and how it work? or ny ref?

 

Let me give you a link to the section in our Ebook - http://www.allaboutcircuits.com/vol_2/chpt_3/2.html.

 

I think you need to know about inductors because you want to design a SMPS. If yes have a look here:

http://www.nxp.com/acrobat_download/applicationnotes/APPCHP2.pdf