[SI-LIST] Re: Power Supply
- From: Mike Brown <bmgman@xxxxxxxxxx>
- To: mahesh@xxxxxxxxxx
- Date: Thu, 11 Mar 2004 23:34:04 -0600
Mahesh,
this sounds like it could be a case of "save money at any cost". You
are going to burn 48 watts of 48 volt power to deliver 12 watts of load
power. Those 36 watts are not free. A DC Converter at 75% efficiency
(and I know that you can do better than that!) burns 16 watts from 48
volts. So if the converter costs less than 20 watts of 48 volt power
delivery, it is actually saving money.
This is overly simplistic, since the 48 volt power may already be paid
for - hence virtually "free".
However, the 20 watt difference will impact the temperature in your box,
and the cooling impact may not be free.
There may be regulatory pressure to isolate the 48 volts from the 12
volt side for safety reasons, in which case you have no choice but an
isolated converter.
Regards
Mike
Mahesh Linge wrote:
> Hi Grp,
>
> Can Any one tell me the solution for Power supply design for 48 volt to 12
> volt(1 Amp).I am looking for a descrete solution.I dont want to use a DC-DC
> converter in this design due to cost constraints.
>
> Hope some one from group will come up with better solution.
>
> Thanks in advance.
>
> Mahesh
>
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