• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 38 subscribers
  • Views 560 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.

PMP21549: Appropriate fuse value

Mark Thompson2
Intellectual 640 points

Part Number: PMP21549

Hi there,

I was just wondering if you have a good rule of thumb for how to select an appropriate fuse to be used in this design to protect the circuit?

Many thanks,

Mark

  • 0
    TI__Intellectual 2895 points

    Hi Mark,

    There are lots of considerations when selecting a fuse, obviously mostly related to fail-safe conditions.  There are lots of reference materials available from fuse manufacturers, and I suggest starting there.  

    Having said that, fuses don't necessarily protect a circuit, but rather prevent a failed circuit from creating further damage to itself or other things/people.  Obviously, the current rating needs to be higher than the input current of your circuit.  A good rule of thumb is to have the current rating at least 1.5 times your input current to avoid nuisance tripping.  Other than current rating, you also need to consider other fuse characteristics including current-time curve ratings and voltage ratings.

    thanks,

    Brian

  • 0 in reply to Brian King
    Intellectual 640 points

    Thanks for your response, Brian!

    Out of curiosity, what fuse rating was installed for the Test Report PMP21549 document?

    Kind regards,

    Mark

  • +1 in reply to Mark Thompson2
    TI__Intellectual 2895 points

    Hi Mark,

    I can't say for sure, because the schematic and BOM have the fuse holder listed rather than an actual part number for the fuse.  However, it was likely the 37216300411 from Little Fuse, because it uses that style fuse holder and has an appropriate rating.

    thanks,

    Brian

  • 0 in reply to Brian King
    Intellectual 640 points

    Thanks again, Brian!