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Zener Diode & Zener Voltage Regulator Calculator

Zener Diode & Zener Voltage Regulator Calculator

Zener Diode & Zener Voltage Regulator Calculator
Formulas and Equations for Zener Diode & Zener Voltage Regulator Calculator
Series Current
IS= VIN – VZ / RS….. (Ohm’s Law Again)
Load Voltage
Change in Load Voltage
∆VL = IZ x RZ
Output (Regulated) Voltage
VOUT= VIN – IR = VIN – (IZ + IL) / RS = (VIN – IS) / RS
Load Current
IL = VL / RL
Zener Current
IZ = IS – IL
Output ripple
VR (OUT) VR (IN) x (RZ/RS)
Maximum Series resistance
RS (MAX) = RL (MIN) x [(VIN (MIN) / VZ) -1]
Maximum Series resistance
RS (MAX) = RL (MIN) x [(VIN (MIN) – VZ) / IL(MAX)]
Or Series Resistance
RS = (VL – Vout) / (IZ + IL) = (VL – Vout) / (IS)
Value of Resistor
R = [(VIN (MIN)– VOUT) / (IL + 10)]
Power of Resistor
RP = (VIN (Max)– Vout) 2­­ / R
Power of Zener Diode


Enter value and click on calculate. Result will be displayed.
Enter values:
Max Input Voltage (VIN (Max)):      Volts
Min Input Voltage (VIN (Min)):      Volts
Output Voltage (VOut):      Volts
Load Current (IL):      mAmp

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Zener:     Volts Zener Power:     Watts
Resistance:     (Ω) OhmsResistance Power:     Watts

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  1. Nucky P.rayanta Natalius says:

    Wowss Good brother ..

    1. Electrical Technology says:

      Thanks for appreciation 🙂

    2. Murthy Challa says:

      Very nice, useful and instant calculation. ThanQ

  2. Ripudaman says:

    To calculate Vout , we need Rs
    VOUT= Vin – Ir = Vin – (Iz + IL) / Rs = (Vin – Is) / Rs

    and then to calculate Rs We need V out again

    RS = (VL – Vout) / (IZ + IL) = (VL – Vout) / (IS)

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