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.
I have not used National's Webench, but I can vouch for the Linear Technologies simulator. Not mentioned is that it does analog simulations very well and there is a LT Spice users group on Yahoo that even offers vacuum tube models.
The underlying engine in the LT Spice simulator is Pspice.
The underlying engine in the LT Spice simulator is Pspice.
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