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LAUNCHXL-F28379D: Isolated supply of the LAUNCHXL-F28379D

Dan8
Intellectual 855 points
Part Number: LAUNCHXL-F28379D

Hello,

I would like to connect the development board LAUNCHXL-F28379D to my prototype converter. I have not managed to find a clear answer to my query regarding the supply of the Launch pad once the jumpers which connect the microcontroller to the USB supply have been removed. To obtain isolation jumpers JP1, JP2 and JP3 should be removed. Now to supply the board if I understood correctly only 3.3V needs to be supplied, since the 5V will be generated by an onboard step up converter by connecting jumper JP6. My query is, through which connector is the 3.3V externally supplied, through J1 and J5 or through J10, please?

Thanks and regards

Dan

  • 0
    TI__Guru 60865 points
    Hi Dan,

    All the 3.3V rails (e.g. VDDA) are sourced from the net '+3V3' and the 1.2V VDD supply is also generated from the '+3V3' net. You should therefore be able to connect to any header with a '+3V3'. Both J5 and J10 seem like they would work fine, and looking at the schematic there may be other possibilities as well.
  • 0 in reply to Devin Cottier
    Intellectual 855 points

    Hi Devin,

    So if I understood correctly there is no main point to supply the 3.3V. It can be supplied simultaneously to connectors J1, J5 and J10. And regarding the 5V it is generated on the Launchpad directly.

    Thanks

    Dan

  • 0 in reply to Dan8
    TI__Guru 60865 points
    Hi Dan,

    The +3.3 rail is connected everywhere on the board, so any post connected to that network will be fine.

    The 1.2V rail is generated from the 3.3V rail via voltage regulator U4.

    The 5V rail can be generated from the 3.3V rail via U12, but you must ensure that JP6 is connected.
  • 0 in reply to Devin Cottier
    Intellectual 855 points

    Devin Cottier said:
    Hi Dan,

    The +3.3 rail is connected everywhere on the board, so any post connected to that network will be fine.

    The 1.2V rail is generated from the 3.3V rail via voltage regulator U4.

    The 5V rail can be generated from the 3.3V rail via U12, but you must ensure that JP6 is connected.

    Great thanks for your help, Devin.