Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 716 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.

5V from Microphone Phantom Power

Andy Neil
Guru 35525 points
Other Parts Discussed in Thread: LM5145, LM76002

I'm looking for recommendations/suggestions for obtaining 5V (for USB power) from 48V Microphone "Phantom" Power.

(nearly?) all Google results seem to be about doing the opposite; eg, this thread:

  • 0
    TI__Mastermind 25590 points

    Andy,

    My experience with phantom power is that it's often derived from 5V/3.3V hence no need to create 5V because it's already there. That may be why it's difficult to find documentation on this use-case.

    We have lots of parts that can do this for you. LM5145 is a good 75V part that would get the job done.

    We can narrow down our portfolio if you can share your needs. Do you need:

    • Fixed frequency
    • A particular switching frequency
    • Good light-load efficiency
    • Other care-abouts...

    Let us know and we'll find something that fits.

    Thanks,

    -Sam

  • 0 in reply to Samuel Jaffe
    Guru 35525 points
    Hi Sam,

    Thanks for the reply.

    The application would be at the microphone end of a microphone cable - so no other supplies available!

    Good light-load efficiency would, indeed, be key - as there is only very limited power available anyhow.

    As it is a microphone lead, low noise would also be good!
  • 0 in reply to Andy Neil
    TI__Mastermind 25590 points
    Andy,

    Check out LM76002. That's a 60V part with plenty of current. It has 15uA Iq and it's a QFN so it should be better for EMI.

    -Sam