Zener Voltage Regulator Calculator
Design series-pass zener regulator circuits with component selection and performance analysis.
Design Parameters
V
V
V
mA
mA
Ohm
mW
Series Resistor
125 Ohm
Zener Current (max)
97.8 mA
Zener Power (max)
499 mW
Line Regulation
73.8 mV/V
Load Regulation
416.8 mV
Additional Results
Resistor Power: 1326 mWEfficiency: 9.6%
Zener Regulator Design
A zener regulator maintains constant output voltage by varying the current through the zener diode. The series resistor must be sized to ensure the zener always conducts (Iz greater than Iz_min) while staying within power limits at maximum input voltage and minimum load.
Rs = (Vin_min - Vz) / (Iz_min + Il_max)