• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 170 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.

TPS2378: TPS2378DDA powered from a power source

albgarc2014
Genius 3520 points
Part Number: TPS2378

Hi TI, 

I have designed a product with the TPS2378DDA that is in production.
For production testing I have indicated to supply the PoE input with 48V from a power supply.
Will the TPS2378DDA work correctly if we supply it from a power supply?

Thank yuo very much. 

  • +1
    TI__Mastermind 21320 points

    Hello, 

    Yes if you use 48V directly on PoE input it should work. That is how we often test it in the lab, we have a CAT5 ethernet wire that we split apart and have banana jack inputs on each pairset. 

    The only thing to watch out for is hotplugging the 48V. I do not suggest having the power supplies at 48V and then directly connecting it. We either slowly ramp up voltage (by hand) or use a power supply with a limiting output. 

    If 48V is already turned on and then connected directly it could spark and cause a current surge. 

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments