[MinnowBoard] USB power adapter

Scott Guthrie scottgu3 at gmail.com
Thu Mar 26 17:42:38 UTC 2015


Interesting.

Makes me suspect mine would work fine if I didn't have the keyboard and
mouse attached, but it also makes me think that even if it did, I'd be
operating too close to Max current on the PSU.  I'd still recommend 3A for
a Max with a Flotsam.

Scott

On Thu, Mar 26, 2015 at 12:18 PM, David Byte <dbyte at suse.com> wrote:

>  I have a flotsam running using a 32GB super cache msata on the CUI Inc
> 2.5A power supply without issue today.  My goal is to ensure I have enough
> power for the entire stack (the 2.5" SSD drive is only rated at 1A, so
> there is plenty left over in the power supply I am looking at.
>
> What I am looking for is just a little more experienced input from someone
> who may have done something similar.
>
> The system I am building is for prototyping software for distributed
> environments.  Think OpenStack, Ceph, HPC, etc.
>
>
> David Byte
> Sr. Technology Strategist
> Alliances and Integrated Systems
> SUSEdbyte at suse.com
> (P)918.528.4422www.suse.com https://www.suse.com/partners/integrated-systems/
>
> On 3/26/2015 11:12 AM, Scott Guthrie wrote:
>
>   I can tell you with my Flotsam with a Crucial 240GB SSD on it (with a
> Wireless USB Mouse and a Corded Keyboard), 2.5A didn't cut it.  I could
> boot, but with Mint up in desktop, as soon as I did ANYTHING, the system
> would crash (voltage/current sag).  Removing the SSD allowed flawless
> operation.
>
>  I have a 3.5 or 4Amp unit now, but I've not tested it yet.
>
>  I don't think you can power the Flotsam with an SSD (or any form of Disk)
> on less than 3 Amps.
>
>  Scott
>
> On Thu, Mar 26, 2015 at 12:07 PM, David Byte <dbyte at suse.com> wrote:
>
>> Good advice Ken.
>>
>> I'm looking to power a stack of up to 8 boards with Flotsam boards and
>> possibly up to 8 SATA 2.5" SSD drives as well.  So, I am assuming I need to
>> be looking at about 16 devices * 2.5A each @ 5V on a good switching power
>> supply.
>>
>> Thoughts of using this:
>> http://www.mouser.com/ProductDetail/Mean-Well/HSP-250-5/?qs=sGAEpiMZZMsPs3th5F8koANcuRqubmL6N%252bynPk%252b952k%3d
>> and breaking it out to the 16 device plugs?
>>
>>
>> David Byte
>> Sr. Technology Strategist
>> Alliances and Integrated Systems
>> SUSE
>> dbyte at suse.com
>> (P)918.528.4422
>> www.suse.com
>> https://www.suse.com/partners/integrated-systems/
>>
>>   On 3/26/2015 9:50 AM, Ken Tait wrote:
>>
>>> These boards have a pretty poor power supply to keep them 'cheap'. That
>>> is why they require 5V in instead of 12V. All of the larger CPU's have a
>>> large instantaneous current draw when they turn on. This gets worse if you
>>> add disk drives or USB peripherals. The plug in the wall power supplies are
>>> poorly designed, they in fact do NOT handle this kind of surge well. If you
>>> get one to work, it is a random event. what you really need is a 5V at 5A
>>> switching supply that has a fast rise time to get this to reliably work.
>>>
>>> If you place an on/off switch in the + power supply lead and plug the
>>> 'plug in the wall' supply in FIRST before turning it on, you may get better
>>> results.
>>> This allows the supply to come up to voltage before turning on the Max.
>>>
>>> As for the barrel jacks, you can get them from Digi-Key or Mouser, lots
>>> of the surplus houses like All-Electronics also have them from time to time.
>>>
>>> Hope this helps
>>> Ken
>>>
>>> _______________________________________________
>>> elinux-MinnowBoard mailing list
>>> elinux-MinnowBoard at lists.elinux.org
>>> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>>>
>>>
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