• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 378 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.

Input capacitance sharing between PTH08T210W

WEIMING QIAN
Prodigy 10 points
Other Parts Discussed in Thread: PTH08T210W, PTH08T250W

I'm using 8 PTH08T210W/PTH08T250W on a ATCA module to power Xilinx FPGAs with total power of ~300W. The datasheet of these DCDC modules require a minimum input capacitance of 470uF/1000uF. If I put one 1000uF Poly Alum capacitor in front of each DCDC module, the whole module will need 8 big capacitors and it takes a lot of PCB space. So the question is what is the minimum input capacitance of N PTH08T210W/PTH08T250W modules in parallel?  Is that just N times the minimum capacitance of each PTH08T210W/PTH08T250W module? I hope it could be much less.

  • 0
    TI__Mastermind 38230 points

    Weiming:

    Ist question :is what is the ripple current rating of the poly aluminum input capacitor? I assume it is greater than  2000 mArms. The 1000 uf Poly  aluminum part number is : What vendor is used?

    2nd question: Are there an input inductors  used to reduce reflected ripple?

    3. The PTH08T250Wxx input capacitance is 560UF when  input voltage is ≥8V.

    4. Input capacitor sharing can carefully be incorporated  if there are no external  inductors separating and isolating  input capacitors from the module  input power pins?

    You can contact me off line at  tguerin@ti.com

    Tom