If you don't need input to output ground isolation, go for a simple buck converter, this will avoid complexity and save time. If ground isolation is required, you would have to go for a transformer coupled topology, and for 2A I recommend either flyback or forward topologies rather than full bridge because they use just a single primary side switch and one or two secondary side diodes.
razunitem said:
If you don't know how to design it (or even if you do), there are two pretty-good ways to get started:
1) Go to http://www.national.com/appinfo/power/webench.html .
2) Download and install http://ltspice.linear.com/software/swcadiii.exe . Then run it and select File-->Switch Selector Guide.
Both 1 and 2, above, can automatically design several different suitable SMPSs for you, using the SMPS controller ICs of either National Semiconductor (1) or Linear Technology Corp (2). I would try both of them.
I don't mean to break the DIY spirit here, but if you are OK with an off the shelf solution, you can try TI's PTN78060W or PTN78060H(these are non-isolated).
http://focus.ti.com/docs/prod/folders/print/ptn78060w.html
I recently used one for a project and it turned out well. The board is VERY compact.
http://focus.ti.com/docs/prod/folders/print/ptn78060w.html
I recently used one for a project and it turned out well. The board is VERY compact.
An externally hosted image should be here but it was not working when we last tested it.
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