v1.0 erratta - Githubissues

JQIamo / Low-noise-5A-power-supply

5A low noise +-15 V power supply for Eurocard boxes

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v1.0 erratta #1

Open npisenti opened 7 years ago

npisenti commented 7 years ago

[ ] Need 22uF tantalum (at least 2x) on +15V regulator; ceramic didn't work
[ ] Space capacitors farther from connector to transformer

npisenti commented 7 years ago

[ ] slow-burn (or other) onboard fuse
[ ] modify for direct heatsinking on back plane; currently fine at 1A/-1A, but at 5A/-3A regulators aren't adequately heat sunk to back panel

restelli commented 7 years ago

Few inconsistencies I have found between BOM and Digikey order

[ ] c11 and c13 445-12883-1-nd (different type of cap)
[ ] fuses? 486-1684-1-nd (10 A)
[ ] C12, C14 and C15 have wrong package. I have placed 10uF instead, but they oscillate
[ ] C7 and C10 are polarized, they need some tweak in the component package and silkscreen

npisenti commented 7 years ago

Here's the BOM I had assembled: https://docs.google.com/spreadsheets/d/1E0YdV9Aq1ntP1aUleoQcLPSlD99kIOq1E6atmrFjB9c/edit?usp=sharing

C11 & 13 i switched because schematic labeled them as 10u while the digikey part number was for a 100n capacitor. I'm guessing this was a copy/paste carry-through of the partno attribute, but worth looking at the prototype just in case.

npisenti commented 6 years ago

[ ] Investigate 22uF cap on neg rail -> better stability at low load
[ ] test points/vias on supply outputs
[ ] Update BOM in eagle
[ ] Export CAD, finalize project
[ ] machining on back panel & assembly instructions
[ ] Heat sink considerations
[ ] Adjust resistor for DC/DC 5V converter for higher dropout (sags marginally across LDO at 3A)