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TCAN1042HGV-Q1: CANL short to 48V test

Ivy Jin
Expert 4545 points
Part Number: TCAN1042HGV-Q1

Tool/software:

Hi team,

My customer is evaluating TCAN1042HGVDRQ1 in their new 48V platform, they found the chip is broken directly when the CAN is shorted to a 48V supply during normal CAN communication. Could you please share some comments?

During normal communication: CANH is 2.5V-3.5V, CANL is 1.5V-2.5V.

When CANL short to 48V, CANH-CANL is -45.5V~ -46.5V

Theoretically, this does not exceed the +-70V range, why the chip is broken?

Thanks.

Regards,

Ivy

  • 0
    TI__Guru 50736 points

    Hi Ivy,

    If the device is damaged, this is most likely due to exceeding the abs max ratings. With 48 V short to battery applied, the IC will observe transients greater than 48 V due to the CMC and TVS diode used. If the transients are then greater than 70 V, damage is common. This can be confirmed by measuring the voltage observed on the device pin when the 48 V short is applied (with and without the CMC, TVS), thanks. 

    Please see Common Mode Chokes in CAN Networks: Source of Unexpected Transients for more information and recommendations, thanks. 

    Best Regards,

    Michael.