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Original question:

TCAN1051HV-Q1: Bus-Pin Fault Protection - Testing

TCAN1051HV: Bus Fault protection time

PYTsai
Genius 9955 points
Part Number: TCAN1051HV

Hi 

The datasheet mentioned the fault protection up to ±70 V . 

Is there an rough idea how long can the device sustain for ±70 V fault ? 

  • 0
    TI__Mastermind 25165 points

    PY,

    The absolute maximum ratings indicate the acceptable range of conditions to which the device can be exposed without sustaining damage. The bus fault protection does not have a time limit.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    TI__Genius 9955 points

    Hi Danny,

    My customer saw the device are damaged, if they keep trying to send of receive data from CAN bus when bus fault condition happens. 

    Can you share what might cause the failure and how to avoid it ? 

    Thanks!

  • 0 in reply to PYTsai
    TI__Mastermind 25165 points

    Hi PY,

    Damage to devices is usually a result of thermal considerations (i.e. overheating). When this fault occurs, the device will drive up to its internal current limit. However, this still would require thermal management in the system to dissipate excess heat. If too much heat builds up in the system, you could expect the device to eventually sustain overtemperature damage. This could be one mechanism that could be occurring.

    Thermal considerations within the IC are still a product of voltage drop and current flow. Dissipating this thermal energy is a consideration for board design.

    Best,

    Danny