1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

A problem with zener limtting output voltage

  1. Nov 15, 2013 #1
    hello guys !!

    i know that in zener diode limitting circuit
    there are three types : 1-limitting Positive peak 2-limitting Negative peak 3-limtting both peaks

    and i know that output voltage for
    limitting positive peak =VZ+0.7v
    limitting negative peak= -VZ-0.7v
    but i don't know what will happen if the input voltage is changed ?!!
    i mean is there a relationship between input voltage and VZ ??

    in this photo i understand that in

    bqKSEw8.png

    (a) Positive peak output = 5.1v+0.7v=5.8v
    Negative peak output =-3.3v-0.7=-4.0v
    (b) Positive peak output =6.2v+0.7v=6.9v
    Negative peak output = -15v-0.7v=-15.7v

    but in related problem i don't know if the output voltage will change if the input voltage is changed ?!!
    i think it will not change but iam not sure about that ..so help me guys !!!

    Thank you :)
     
  2. jcsd
  3. Nov 15, 2013 #2

    gneill

    User Avatar

    Staff: Mentor

    The zener characteristics are nearly independent of the input voltage. I say nearly because "real-life" zeners do have a small resistance value that will make the zener voltage vary a bit when its current changes (the same holds true for all diodes). Do a web search for zener characteristic curve and zener equivalent model.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: A problem with zener limtting output voltage
  1. Zener diode problem (Replies: 9)

Loading...