[MinnowBoard] USB power adapter

[David Byte]

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
SUSE
dbyte at suse.com
(P)918.528.4422
www.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 
> <mailto: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 <mailto:dbyte at suse.com>
>     (P)918.528.4422 <tel:918.528.4422>
>     www.suse.com <http://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
>
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