[Soekris] net4801 DC INPUT

[Antoine Zen Ruffinen]

If you look at the graphs called "Efficiency Vs load current" page 12 of 
the datasheet, you will see that it has better efficiency with low input 
voltage.

Stanislav Meduna a écrit :
> 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.
>
>