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Common Mode choke testing for CAN bus

Vinod Kanoji
Prodigy 90 points


Hi,

    I am using EPCOS B82789-C0513-H common mode choke in my CAN bus network and i have other two common mode chokes from TDK and murata as an option. How can test these chokes by replacing one by one (soldering/desoldering) and what parameters to be checked and conclude which one is good.

Regards

Vinod Kanoji

  • 0
    TI__Guru 74322 points

    Vinod,

    Common-mode chokes are typically used to help mitigate EMI from the transceiver to the rest of the system and vice versa. If you have a way to test for conducted/radiated emission or RF immunity, these are the best methods of testing chokes. The intent of a common-mode choke is to "choke" out high-frequency noise from and to the CAN bus.

    If there isn't a feasible way for you to test emissions or immunity, you could also check the time-domain waveforms and compare the edge rates for the dominant-to-recessive edge. Typically chokes will help with the ringing present on this edge of the CAN bus signals.

    Please let me know if you have any other questions.

    Regards,