Zener Diode Voltage Regulator Calculator
This calculator helps you design a basic Zener diode voltage regulator circuit by computing the output voltage, given the input voltage, Zener voltage, and the load and series resistance values.
What this calculator is doing
A Zener diode is used to maintain a stable output voltage across a load, even if the input voltage fluctuates. In this regulator configuration, a resistor is placed in series with the Zener diode, which is reverse-biased. Once the input voltage exceeds the Zener breakdown voltage, the diode conducts and maintains a constant voltage across the load.
The output voltage is approximately equal to the Zener voltage, as long as the input voltage is high enough to keep the Zener diode in breakdown:
$$ V_{out} \approx V_Z $$
To ensure proper regulation, the Zener current must stay within the allowable range. The Zener current is given by:
$$ I_Z = \frac{V_{in} - V_Z}{R_s} - I_L $$
Where:
- \( V_{in} \) is the input voltage
- \( V_Z \) is the Zener breakdown voltage
- \( R_s \) is the series resistor in ohms
- \( I_L \) is the current drawn by the load
The Zener diode regulates correctly when \( I_Z > 0 \), meaning the diode is in its breakdown (conducting) region.
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Disclaimer: These calculators are provided for informational purposes only. Always verify your designs against relevant engineering standards and consult a qualified professional. We do not take responsibility for any errors or damages resulting from the use of these calculations.