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LM5046: Huge reflection Power Supply spikes when Board is inserted

Jordi Ferre Ferran
Prodigy 50 points
Part Number: LM5046
Other Parts Discussed in Thread: TPS2393, LM5064

We are having issues with new hotplug used on latest board developments. Customer has complained that when they insert one board in the chassis, other boards already inserted are affected ( Board resets ). We didn’t saw that issue in “old” boards.

 

New boards are equipped with: LM5064PMHE/NOPB

 

Old boards are equipped with: TPS2393APW

 

We have been doing a lot of different tests past  weeks but we are not able to find the issue, neither to improve results. We have noticed that a huge spike is generated when we insert the board which affects the other boards on the rack. That spike has a smaller slope in Old hotPlug

  • 0
    TI__Genius 14580 points

    Hello,

    The TPS2393 is used for HOTSWAP on the old board, but LM5046 is used for full bridge control. They are completely different, and can't be replaced with each other. Are you sure LM5046 is a right part to be replaced?

  • 0 in reply to Sean Xu
    Prodigy 50 points

    Hi,

    Thanks for quick answer. 

    However the title of subject is wrong ( we made a mistake when we have selected PN on the form ). The correct PN is LM5064PMHE/NOPB which is supposed to be also a HOTSWAP.

    So please, could you help us with spikes generated by LM5064 ?  any suggestions ? Any explanations ? Any improvements ?

    Regards

    Jordi

  • 0 in reply to Jordi Ferre Ferran
    TI__Genius 14580 points

    Hello,

    Thanks for the clarification. LM5064 is supported by different product engineers. I am not sure who I should forward to. The better way is to restart a new post thread using LM5064. It will go to right engineers to answer your question. 

    Regards,