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Stepdown voltage

Discussion in 'General Electronics Discussion' started by jesse nobles, Jun 10, 2017.

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  1. jesse nobles

    jesse nobles

    Jun 10, 2017
  2. davenn

    davenn Moderator

    Sep 5, 2009
    the current is determined by the load ... in this case, what the 3 fans draw
  3. Irv


    Jun 7, 2017
    I have one of those. If you draw much current, be sure one of those fans is cooling the step-down module :)
  4. BobK


    Jan 5, 2010
    Theoretically you can get 3X the average current if you step down from 36V to 12V, but the devil is in the details. There is an efficiency issue, which will reduce it by 10 to 20%. And also, it is the average current that is reduced. In the typical buck converter topology, all of the current flowing to the load comes from the source during the on portion of the duty cycle. So, if the fans require 1A each you will be pulling 3A from the solar panels, but only 1/3 of the time, resulting in an average of 1A.

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