Hi David,
That's alot of startup current. 40 amps is tough. You will definitely
need a real switching supply, allow at least a 15% overhead on the max
current.
You might be better off using 2 smaller supplies(2 x 25A), one just
wired to the SSD's. This may end up being less expensive than 1 big
40amp unit.
I had to do something like this once for a hand held gaming system
charger. We used MeanWell supplys, very good at good price with good
short circuit and overcurrent...but there are many good choices out
there. What you are looking for is one with good transient response.
I have a 30A unit on my bench running a laser driver and it takes alot
of abuse...
Digikey sells barrel jacks with molded leads attached. I think CUI makes
them? Not sure what the wire gauge is, but I would go at least 18 gauge
so there is no voltage drop at the actual barrel jack. Barrel jacks
really suck for this type of board. Despite what the specs say, they are
really good for only about 1.5Amps. It would have been better off with
straight .156" 2 pin header....Remember, there is a reset monitor that
will trip if the 5V is too low, or comes up too slowly.
Good luck
Ken
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