• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 465 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.

UCC39002: UCC39002 current Amp ratio

Marco Hsieh
Intellectual 1060 points
Part Number: UCC39002

Team,

If my load share full scale voltage is 8V, use R sense 0.125 mohm, and output current 100A/CH.

Per those parameters, I will design current sense Amp ratio to "640" (640k/1k).

Will this design work or not?? I am afraid that will hit the current Amp limit.

Marco

  • 0
    TI__Mastermind 34465 points
    Hi Marco,
    With a 100A load and a 0.125mOhm senses resistor, the sensed voltage is 12.5mV.
    So with a gain of 640, the expected output voltage of the current amplifier needs to be 8V.
    This means that you need at least 8V+2V = 10V on the VDD pin.
    What voltage do you have on the VDD pin ?

    Regards,
    John Griffin