V2.0 AUX_PSU - discussion and fix list

[mkiepiela]

We are going to make new revision of AUX_PSU. Issues to fix:

• Stock problems #10
• LT3089IFE schematic symbol - wrong pinout #11
• LT3089IFE - ILIM pin wrongly connected and resistors wrong values. #12
• LT3089IFE - lack of dummy load - LDO out of regulation #13
• LT3089IFE - wrong values of voltage setting resistors #14
• LT3089IFE - too high dropout voltage - extra power dissipation #15
• Negative voltage channel - wrong feedback circuit #16
• layout issues #18
• wrong 2.4V divider #19
• OC LEDs have inverted function #20
• sw2 and sw3 swapped #21
• update trimpot values #22
• Current limit for negative rail too high #24

Feel free to add any suggestions/issues/ideas for new revision.

[gkasprow]

make DIOT variant, expose the EEM connector and we will make Iso-SPI mezzanine.

[maciejprzybysz]

@mkiepiela #27

[jbqubit]

Looking forward to the updated version. :)

[martafafara]

V2.0 ready to review

[gkasprow]

There is one remaining issue from my list:
"add 10uH 1A inductor in series with L12, L11, L10"
Ferrite beads are pure resistances at the switcher frequency, and a lot of SEPIC noise goes through the LDO's poor PSRR at that frequency.

[martafafara]

@gkasprow I haven't seen it before. inductors added.
Additionally, power-up delay circuit added. Removed DIOT part break-off milling. Hole in front of Molex power connector added for easier plug inserting.

[jbqubit]

Sounds like this is released for manufacturing! Please create a Release tag on github including PDF schematics, layout and BOM.

Is there a plan for I2C ADC readout support in ARTIQ?