[Arm-netbook] eoma68 router pcb

[Christopher Thomas]

On Wed, Nov 13, 2013 at 8:42 PM, Scott Sullivan <scott at ss.org> wrote:

> On 11/13/2013 08:41 PM, Christopher Thomas wrote:
>
>>     On Wed, Nov 13, 2013 at 6:34 PM, luke.leighton
>>     <luke.leighton at gmail.com <mailto:luke.leighton at gmail.com>> wrote:
>>          > anyone any experience at dealing with that much power on
>>         small boards
>>          > (4 amp @ 5V) ?
>>
>>           LM1084?  any guidance on PCB layout anyone aware of?
>>     Well, this will obviously be a 4 layer board, but I can say with the
>>     MEBv2, we had tremendous problems with thermal dissipation of the
>>     LM2576 at 9-12vdc, at 6vdc is was manageable, but the MEBv2++ are 2
>>     layer boards, and with the addition of a secondary power plane, it
>>     would probably have been fine. For the most recent versions, we are
>>     using an AP6503a, and so far at 6, 9,12 vdc the heat is
>>     non-existent. Not to mention, the local price of the AP6503 was .60c
>>     cheaper than the LM2576, and is 85-95% more heat efficient.
>>
>>
>> My point in mentioning the LM2576, is that they are functionally similar
>> to the LM1084, and both Linear.
>>
>
> CUI does board mount switching regulators that generate a lot less heat.
>
> http://www.cui.com/product/power/dc-dc-converters/
> isolated/board-mount/20-w/pyb20-series
>
> PYB20-Q24-S5 is an isolated supply that will output 5V at 4A.
> But that digikey pricing suggests their not economical yet.
>
> http://www.digikey.com/product-search/en/power-supplies-board-mount/dc-dc-
> converters/4325599?k=PYB20-Q24-S5
>
>
>
While not the best for the job, it's certainly appealing at .22c versus
$39. But taps out at 3A. if there's a way to cull some wattage from the 20w
point.

http://www.digikey.com/scripts/DKSearch/dksus.dll?Detail&itemSeq=138936230&uq=635199731575593822
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