We have the same outlets in the 733, at the moment our EFBs take that as usual source of power as do the flightdeck mobile-phones. Tested it on various noteboots as well without any problem, no matter if wintel or apple notebooks.
At the moment we try to certify a second 115v/400hz outlet so that both EFBs can run on power since their batteries run dry after just 2 to 3 hours and its a bloody nuisance to change them between pilots all the time.