1. Limited time only! Sign up for a free 30min personal 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!

Zener diodes homework

  1. Nov 1, 2009 #1
    1. The problem statement, all variables and given/known data

    A designer requires a shunt regulator of approximately 20V. two kinds of zener diodes are available: 6.8V devices with r_z=10ohms and 5.1V devices with r_z=30ohms. For the two major choices possible, find the load regulation. In this calculation neglect the effect of the regulator resistance R.

    3. The attempt at a solution

    For the first type of zener diode i figured that 3 of them would provide 20.4V with 30ohms resistance. For the 5.1 zeners, using 4 diodes to provide 20.V with 4*30=120ohm resistance would also do the trick. What I'm having trouble with is finding the load regulation which according to my solution manual should be -30mV/mA and -120mV/mA.
  2. jcsd
  3. Nov 5, 2009 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    I guess I'd have to see a circuit schematic to see what is going on, and perhaps an explicit definition of load regulation as well. I do notice that the load regulation is simply -R for each Zener combination.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Zener diodes homework
  1. Zener diode (Replies: 8)

  2. Zener diodes (Replies: 6)

  3. Zener diode problem (Replies: 9)

  4. Zener Diode problem (Replies: 6)