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Hardware Errata

This page lists some issues with the hardware rev 1:

  • MOSFET gate drive voltage too low
    • VGs, with the current configuration can only drive to max +3V3. This is not sufficient to turn on the MOSFETs selected (IXTH80N075L2) with a VGs(th) of 4.5V max
    • May be salvageable by rework (op-amp powered from 5V instead) and selecting a different MOSFET
    • Future work
      • Select a MOSFET driver opamp that can be powered from ±12V
      • Update power section to generate isolated 12V (replace PS201 with PDSE1-S12-S12-S)
      • Generate 5V locally (switching supply off 12V)
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