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TCAN1473-Q1: Question about EMC test fail

Chase Jeong
Mastermind 8905 points

Part Number: TCAN1473-Q1
Other Parts Discussed in Thread: TCAN1462-Q1

Dear TI experts,

My customer tested EMC CE current test in the lab, but the test result was fail. (Over the bandwidth of 20Mhz)

Customer's product is used TCAN1473CDMTRQ1.

Customer used TCAN1462-Q1 in their previous product before but customer did not see the results like this.

Could you check the reason of this failed result although TCAN1462-Q1 has no problem?

Please check this issue. Thanks,

Best regards,

Chase

  • 0
    TI__Guru 69477 points

    Hi Chase,

    • Ensure the power supplies do not droop. For example, confirm VCC is at 5 V when measured at the IC pin, and not somewhere near 4.75 V.

    • Ensure total bus load or any other nodes connected ≤ 50 pF.
    • Ensure the previous passing case did not include CMC, similar to the NC CMC as this case. Verify if it passes with CMC. Ensure CMC of 50 to 100 uH passes.
    • Ensure the previous case includes a similar termination as this case (or help confirm any / all differences in from the passing case). Verify if it passes with 60 ohms split termination at both ends of the bus for an effective bus termination of 60 ohms.
    • Ensure cable impedance is close to 120 ohms as well, thanks.

    Best Regards,

    Michael.