full bridge dc dc converter

[razunitem]

full bridge dc dc converter 30v/12v and Iout=2A

how can design it this circuit?

 

[Eva]

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.

 

[gootee]

full bridge dc dc converter 30v/12v and Iout=2A

how can design it this circuit?

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.

 

[theAnonymous1]

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.

[IMGDEAD]http://i12.tinypic.com/6urys9k.jpg[/IMGDEAD]

 

[hermanv]

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.