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TCAN1043A-Q1: Fault protection on 48V system?

AnBer
Mastermind 30150 points
Part Number: TCAN1043A-Q1

Team,

The datasheet indicated "±58-V CAN bus fault tolerant":

-Does it means that the transceiver can be used or is meant to be used on 48V system?
-Can the on-chip Fault protection mechanism sustain fault from a 48V system bus?

Thanks in advance,

A.

  • 0
    TI__Genius 15345 points

    Hi A,

    The ±58-V CAN bus fault tolerance is the maximum voltage that the CAN bus can withstand without doing permanent damage to the device. However, it is not recommended that you operate within that range continuously and if you do so you can degrade the life of the device.

    When it comes to a 48V system the answer is most likely no. The VSUP pin of the TCAN1043A is meant to be connected to the battery of the system. The maximum recommended VSUP voltage is 40V. So you would have to step down your battery level in order to operate within recommended spec. If you absolutely need the VSUP to be connected to a 48V battery you can look at the TCAN1043Hx. The TCAN1043Hx has a +/- 70V bus fault tolerance and a recommended VSUP range of up to 60V.

    When it comes to surviving a fault from a 48V system it all depends on what a fault from your system looks like. If the fault is within +/-58V then you will be fine. But if there is a large overshoot / undershoot or a very large surge voltage outside of the ABS max spec then the device could be permanently damaged.

    Best,

    Chris