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passive components
Zener Diode
Computes the series resistor, resistor power dissipation, and zener power dissipation for a zener diode shunt regulator. Assumes a minimum zener current of 10mA.
Inputs
Maximum supply input voltage in volts — used for worst-case power calculations
Minimum supply input voltage in volts — used to size the series resistor
Desired regulated output voltage (= zener voltage) in volts
Load current in milliamps — 10mA minimum zener current is added internally
Results
⚠Minimum input voltage is too low — must be greater than output voltage + 0.8V
Resistance—ΩRequired series resistor value in ohms
Resistance Power—WWorst-case power dissipation of the series resistor in watts
Zener Voltage—VZener diode voltage — equal to output voltage
Zener Power—WWorst-case power dissipation of the zener diode in watts