Formula Doubt

Discussion in 'General Electronics Chat' started by imraneesa, Feb 20, 2015.

  1. imraneesa

    Thread Starter Member

    Dec 18, 2014
    184
    4
    I want to know how they got the value 25.1kohm. what is the value of (In). they have not mentioned it. please check it. I am attaching the part of datasheet for your reference.

    http://www.ti.com/lit/ds/symlink/lm3409.pdf
     
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  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    ln is the natural logarithm.
     
  3. imraneesa

    Thread Starter Member

    Dec 18, 2014
    184
    4
    Oh OK OK. Ty sir. How much ripple current I can assume for laser diodes? Since they are very sensitive for spike currents.
     
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