• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 64 subscribers
  • Views 621 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LM7310: Does LM73100 have any protection mechanism when the back to back FETs are shorted or when Input short to output ?

Kai Lai
Expert 8136 points
Part Number: LM7310
Other Parts Discussed in Thread: TPS65994, CSD87501L

Hi Team, 

My customer is currently design the PD controller and the power path, and they are concerning one scenario which is when the back-to-back FETs are shorted or when Input short to output, does LM73100 have any protection mechanism ?
Since one of the project spec is they need to meet the IEC 62368-3 requirement.

They are considering when one port is short, the other port is working even at 20V, the other one port typeC connector will have 20V, it is not safe. 

Customer original design is our TPS65994 + CSD87501L, and I think CSD87501L is just a pure back-to-back FETs, so I think it should not have any protect when short event.

So I think LM73100 may be the good solution here, how do you think?

Thanks!

Kai Lai

  • 0
    TI__Guru 70460 points

    Hi Kai ,

    Thanks for reaching out. I will get back to you at earliest.

    Regards

    Kunal Goel

  • +1 in reply to Kunal Goel
    TI__Guru 70460 points

    Hi Kai,

    In IEC62368-3 testing ,is a physical short place between IN and OUT? Also when we say that back to back short ,what is causing them to short?

    Once we place short between IN and OUT then the device does not have control on that current flow path and it can't provide protection. So not only LM73100 but other devices also may not be able stop current flow in that case. 

    LM73100 does provide other protection features such as protection from short at output, overvoltage protection ,undervoltage protection, slew rate control, overtemperature protection, current monitor and power good indication and is suitable in this application.

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Expert 8136 points

    Hi Kunal,

    Thanks for your kindly reply!

    I also check this question with our PD controller team, and they said the IEC62368-3 is a new test spec, our PD controller will support this protect function in the next generation product, so I think this should be protect by controller instead of power path.

    Still thanks for your support!

    Have a great day!

    Kai