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You can try this IC lm2576 from national semiconductor.
It is a complete information to build the dc-dc regulator.
Input can be from 7Vdc to 40Vdc.
Output is a regulated 5Vdc.
3A is the maximum current, the regulator is able to handle.
The website include PCB layout, schematic and components
that are required to build your own dc-dc regulator.
The following website contains information on LM2576 dc-dc converter regulator,
Use UC3843-5 or similar IC .
These ic designed for use with 110-220VAC but you can use there with about 12-30 volts.
Just you need few change in design eg. transformer winding ratio.
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