Engineering Theory & Mathematical Model
Whereas standard rectifiers avoid reverse breakdown, a Zener diode is heavily doped to operate safely and nondestructively at a sharp reverse breakdown knee Vz (5.1V). As input voltage Vin rises, the Zener absorbs extra shunt current Iz so the drop across series resistor Rs increases proportionally, holding load voltage nearly constant.
Interactive Lab Procedure
- Compare CH1 (rippling 9V–15V unregulated input) with CH2 (flat, regulated load output) on the oscilloscope.
- Lower input DC offset on VIN below 5V to see regulation drop out when Vin falls beneath the Zener knee!
- Inspect Zener power dissipation P = Vz × Iz to verify thermal margin.
Technical FAQ
What is the core governing formula for Zener Diode Shunt Voltage Regulator (5.1V) Simulator?
Iz = (Vin − Vz) / Rs − Vz / RL — Whereas standard rectifiers avoid reverse breakdown, a Zener diode is heavily doped to operate safely and nondestructively at a sharp reverse breakdown knee Vz (5.1V). As input voltage Vin rises, the Zener absorbs extra shunt current Iz so the drop across series resistor Rs increases proportionally, holding load voltage nearly constant.
Can I modify component values and rewire this circuit live?
Yes! The schematic above runs a live MNA SPICE engine. Click any part to adjust parameters, add or delete wires and components, and click Share URL to save your custom topology.