• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 387 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCAN1044V-Q1: CAN Bus fault Spec inquiry

Lee, Sam
Expert 6255 points

Part Number: TCAN1044V-Q1
Other Parts Discussed in Thread: LM5088-Q1

Hello team,

A customer asks about how the bus fault range is determined. Would you please explain it or share any document?

   Ex)  A: 12V system : +/- 45V

          B: 24V system : +/-58V

          C: 48V system : +/-70V

Thanks,

Sam Lee

  • +1
    TI__Mastermind 26836 points

    Sam,

    Please use TCAN1044AV-Q1 in place of TCAN1044V-Q1. It is a drop-in upgrade, and TCAN1044V-Q1 will not have supply to support new projects over time. TCAN1044AV-Q1 will have this increasing supply.

    We have a few resources that can help explain your question. The primary driver of this protection requirement is load dump during ignition, when the battery supply voltage level can fluctuate significantly. The clamping of this pulse is dependent on the type of system, as you mentioned above. Load dump in 12 V systems is typically clamped near 40 V, and in 24 V systems it is typically clamped near 58 V, which is why VBUS is capable of handling this voltage in case of a fault event during ignition.

    Here is an application note that discusses load dump in the context of LM5088-Q1: https://www.ti.com/lit/an/snva681a/snva681a.pdf

    Here is a TI training video that gives a general overview of automotive transients: https://training.ti.com/automotive-transients-explained

    Best,

    Danny