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Original question:

TCAN1044AV-Q1: Common mode choke recommendation ?

TCAN1044AV-Q1: CAN bus CMC

Zehui Li
Intellectual 540 points

Part Number: TCAN1044AV-Q1

Tool/software:

Hi，

   I read the app note Common Mode Chokes in CAN Networks and this stream https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1361812/tcan1044av-q1-common-mode-choke-recommendation?tisearch=e2e-sitesearch&keymatch=common%2520mode%2520choke#.

  1.Any kind of CAN transceiver can be the victim. No matter whether it's TI's product or not. Right?

  2. How to guarantee one kind of CMC is proper？I think the measurement results in the note depend on the setup and layout. Every implementation has different result.

  • 0
    TI__Mastermind 27650 points

    Hi Zehui,

    1. Yes, if the voltage transient exceeds the device's abx maximum ratings, it can damage any CAN transceiver, doesn't matter TI's or other's.

    2. It it difficult to guarantee a specific type of CMC would be proper. However, the app note measured transient voltage at transceiver bus pins with various CMC on the market, it could be a good reference since our test setup and board layout keeps same when testing those different CMCs.

    Regards,

    Sean

  • 0 in reply to Sean Guo
    Intellectual 540 points

    Hi Sean,

    2.Could I believe if a CMC has a lower transient voltage at TI's test and it will still be the better one in other situation, compared with other CMCs? As for the actual measured transient voltage value, I'm afraid I couldn't get the same measured result, just as I said above.

  • 0 in reply to Zehui Li
    TI__Mastermind 27650 points

    Hi Zehui,

    Yes, as our app note states, TI's measurements use a very typical CAN bus setup which have shown that the transient voltage levels are highly dependent on the common-mode chokes core type and inductance value. I agree that different test setup and board layout can result in different measured transient voltage value, but the conclusion will not change, those CMC we tested with lower transient voltage will always be better compared to others.

    Regards,

    Sean