Solving Zener Diode Problem - Need Help

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SUMMARY

The discussion focuses on solving a Zener diode circuit problem involving a 15-volt supply and a load requiring 10 volts. Participants emphasize calculating the series resistor value based on the total current, which includes both the load current and the minimum Zener current. The importance of verifying the Zener diode's power rating to prevent exceeding its limits is also highlighted. Additionally, the impact of varying the supply voltage to 20 volts and the absence of a load resistor is discussed.

PREREQUISITES
  • Understanding of Zener diode operation and characteristics
  • Basic circuit analysis techniques, including Ohm's Law
  • Knowledge of power ratings and thermal limits in electronic components
  • Familiarity with series resistor calculations in voltage regulation circuits
NEXT STEPS
  • Study Zener diode voltage regulation techniques
  • Learn how to calculate power ratings for Zener diodes
  • Explore the effects of varying supply voltages on circuit performance
  • Investigate load resistor impacts on Zener diode current and voltage stability
USEFUL FOR

Electronics students, hobbyists, and engineers working on voltage regulation circuits using Zener diodes.

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Homework Statement



Please refer to the picture
[PLAIN]http://img337.imageshack.us/img337/7118/46864828.jpg

Can anyone help me?
Thanks.
 
Last edited by a moderator:
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You can work out the value of the resistor when the load is connected, but there is only a 15 volt supply.

You know the minimum current for the Zener and you know the current in the load (it has 10 volts across it) so you know the total current in the series resistor.
You know the voltage across this resistor so you can work out what size resistor it should be.

So, you can select this resistor and see how it affects the currents when there is a 20 volt supply and/or there is no load resistor.

Notice that the Zener will take whatever current is necessary to maintain the output voltage at 10 volts.

Then check if the Zener power rating is being exceeded.
 

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