VAX-11/750 power supplies
ard at p850ug1.demon.co.uk
Wed Apr 8 11:46:30 CDT 2015
> However looking in the print set the diode is listed as 1114197-00 with the
> remark "60 AMP POWER SCHOTTKY DIODE"
> Is the Unitrode USD5096F a 60 Amp diode? This link tells me it is a 35A
> and so does this link:
It's possible (although unlikely) that DEC selected diodes that could stand 60A for this location from what were
nominally 35A parts. More likely, I think, is that what is _needed_ here is a 35A diode (what is the output current
of this PSU) and that the originially specified part was a 60A one (which is clearly be OK). Then somebody found
a 35A part that would work.
Of course you can always fit a higher current diode than is strictly required (provide the switching times are
fast enough in a circuit like this). My guess is that since diodes have improved since the days of the 11/750,
you could fit modern 60A shottky diodes without problems.
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