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rich77777 Guest
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Posted: Tue Jun 19, 2007 3:46 am Post subject: Voltage drop across resistor in series with zener diode |
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how do i find this? i thought i would take the 22v source and just subtract the 0.7v that the diode takes.
but i am wrong, please help me!!  |
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vtech
Joined: 08 May 2006 Posts: 1264 Location: USA
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Posted: Tue Jun 19, 2007 4:42 am Post subject: |
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The .7v drop across a standard silicon junction is correct, however a zener diode behaves as an open circuit until reaching it's rating & acts like a voltage regulator/crowbar during it's avalanch mode. In other words the voltage drop across a Zener diode will equal to whatever it's rated when "zenering" ---NOT .7v as in a regular diode.
Purpose of the resistor is to limit the current through the zener during it's breakdown voltage region.
Here's a detailed example;
http://www.allaboutcircuits.com/vol_3/chpt_3/9.html |
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