Add fuses to main 12V and 3.3V management power line from backplane

uob-hep-cad / uob-hep-pc072

DUNE MIB

CERN Open Hardware Licence Version 2 - Strongly Reciprocal

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Add fuses to main 12V and 3.3V management power line from backplane #22

Open DavidCussans opened 7 months ago

DavidCussans commented 7 months ago

Fermilab electrical safety reportedly insist on fuses at power input to boards. This isn't usually done on uTCA boards, but add fuses to make life easier for ourselves

Normal operating power for MIB ~ 12W ( i.e. 1A from 12V )

Put in 3A slow-blow surface mount fuse for VP12 Put in 100mA slow-blow SMD fuse for MP3V3

oxfpete commented 4 weeks ago

3A fuse in place (taken from 065 design). 100mA will be a fast fuse unfortunately, component will be added once I have found a part number.

oxfpete commented 4 weeks ago

SF-0603FP015F-2 will used on 3V3 line, it is a 150mA fast fuse - hopefully has enough head room to compensate for in rush at power on. 100mA was originally requested but not available in slow-blow as an 0603.

oxfpete commented 4 weeks ago

Done.

DavidCussans commented 2 weeks ago

Schematic looks good.