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DS90UB954-Q1EVM: POC 24V Compatibility

Part Number: DS90UB954-Q1EVM
Other Parts Discussed in Thread: DS90UB953-Q1EVM,

Tool/software:

Hello TI team,

the DS90UB954-Q1EVM and DS90UB953-Q1EVM Eval boards now support 9V POC by default.
We would like to know if these boards support 24V POC.
If so, Is there a guideline or a list of recommended components that need to be changed?

Thank you in advance

  • Hello Mohamed,

    The whole board is designed for 12V input power supply. It is not recommended to modify it for higher voltages. However, this is possible, but you may need to replace almost all power supply components to support the higher input voltage.

    The following devices (on the UB954 EVM) may need to be replaced/adjusted:

    U4, U6, U7, U8, U9, U10

    R92, R94, R97, and R98

    Also, you need to check other passive components like capacitors, resistors and inductors/FBs on the power supply path and on the PoC network + the AC coupling capacitors, and make sure these are rated for 75V (24V x 3) or higher.

  • Hello,

    Thank you for your quick reply,

    So if we use J18 and J17 to power the POC externally, do we need to change all these components or just the passive components in the PoC network?

  • Hi,

    If you use J17 and J18 for external PoC supply, you will not need to change the power supply components mentioned above, but you need to check the passive components like capacitors, resistors and inductors/FBs on the PoC network + the AC coupling capacitors, and make sure these are rated for 75V (24V x 3) or higher.

  • Thank you for your reply!

    Regarding the DS90UB953-Q1EVM serializer side, I assume we need to make the same changes to the passive components.
    But there is no need to change the power supply components U8 and U9 as they already support 24V.

    Is that correct?

    Thank you in advance,

  • This is correct, U8 and U9 do support up-to 36V input voltage.

    However, as I said earlier, these boards were designed for 12V input voltage. Hence, you need to make your own research and testing to insure you will not be facing any issues.