Antoine Zen Ruffinen wrote:
> Anyway, in general, giving the lowest input voltage
> to a regulator that you can (but not to close from the lowest limit), is
> a good idea. it will ask less effort from the regulator.
This is very true for linear regulators, but for switching
ones it might actually be the opposite - higher voltage
means less current and less wasted energy.
To the OP: The 28 V is too close to that 30V, especially
if the power supply is unregulated. Better go with the 20.
--
Stano
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