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LM5122: LM5122

Sangram
Prodigy 25 points
Part Number: LM5122
Other Parts Discussed in Thread: PMP9256

Tool/software:

please share the schematic and BoM of evaluation board with transformer PA2398NL.

  • 0
    TI__Mastermind 29640 points

    Hello Sangramsinh,

    Thanks for using the e2e forum.
    If you are referring to one of our EVM boards, please have a look at the according User's Guide, which can be found in the technical documentation section.
    This file includes a BOM list.

    If you are looking for the datasheet of a component listed, you can simply browse the component name at the manufacturer website and download the datasheet from there.

    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Prodigy 25 points

    Hi Niklas,

    I am using PMP9256 EVM board. But i found some mismatches in component values with BoM and schematic also there is no footprint/ placement provision for few components.

     could you provide exact BoM for EVM using transformer with part no. of PA2398NL.

    Also in BoM inductance for above transformer is 307uH but in actual datasheet of transformer they mention 100uH. please confirm the same.

  • 0 in reply to Sangram
    TI__Mastermind 29640 points

    Hi Sangramsinh,

    Thanks for pointing this out.
    I will check the schematic and BOM mismatch and see if a revision is necessary.

    Please allow me time until tomorrow to get back to you.

    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    TI__Mastermind 29640 points

    Hi Sangramsinh,

    I agree the schematic is rather confusing here.
    In fact, the PCB uses two different inductors X1_A and X2_B.
    Only one is populated and only the X1_A is listed in the BOM document.
    I assume they created footprints for both inductors to compare the performance of each of them.

    Unfortunately, I cannot see which of the two inductors was considered the better selection, but depending on your design requirements, you can also choose which of the two inductors would be more suitable for your design, or even choose a completely different part.

    I also recommend to check our power stage designer tool to assess which inductance leads to which current levels within the system.
    https://www.ti.com/tool/POWERSTAGE-DESIGNER

    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Prodigy 25 points

    i'm using X1_A, can you share BoM for same.

  • 0 in reply to Sangram
    TI__Mastermind 29640 points

    The BOM can be found here.
    https://www.ti.com/lit/df/snvr389a/snvr389a.pdf

    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Prodigy 25 points

    Hi Niklas,

    could specify which components need to populate to use transformer X1_A.

    Also conform inductance value for same.

    As per BoM it is 307uH but as per datasheet for that part it is 100uH.

  • 0 in reply to Sangram
    TI__Mastermind 29640 points

    Hi Sangram,

    If the inductance varies between the BOM and the datasheet, I would always follow the datasheet of the components.
    In this case, I would calculate with 100uH inductance.
    The datasheet gives also information about the footprint necessary for the component to fit.
    Please make sure that the winding are connected correctly, otherwise primary and secondary side will conduct current at the same time and you will not get the required power to the output side.

    Best regards,
    Niklas