>I will have a look at 100KHz, it makes sense. I have now to
>look at inductor selection which seems a bit confusing.

Have a look at the mail that Olin sent through here recently, which gave a 
pretty good formula for designing a converter. As set out I think it was for 
buck converters, but should work for boost ones as well. It is the last one 
under "[EE] 24 -> 5V switching regulator?" You should be able to find it in 
the piclist archive using that subject line as your search criteria.

Also look at the devices and application notes from Linear Technology. 
Essentially the core of their business is convertor chips. The LTSpice 
program is built around designing for these chips (although it does general 
purpose spice as well). They have chips for all sorts of power ranges, 
including multiphase ones that get some reasonable power outputs.

http://www.linear.com/index.jsp


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