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There are still several tasks that need to be considered regarding
the electrical needs of the CPU board. A suitable power supply
needs to be purchased or designed. This power supply needs to
supply a current of 4 amps at a voltage of +5V (). This
requirement on the power supply excludes using a linear supply as
the power dissipation would be too great:
Assuming a worst case battery voltage of +14V.
We would need to dissipate 36W of power in the liner regulator, so
for this application a high efficiency switching regulator.
National semiconductors produces a line of ``simple switcher"
regulators that require few external components to design such a
power supply. The task of designing this power supply will occur
after the platform has been assembled and tested, as code
development can begin without it by simply using a standard PC