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Semiconductor Devices — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Devices2 Marks
Question
The voltage stabilization is effective when there is a minimum Zener current. The Zener diode must be always operated within its breakdown region when there is a load connected in the circuit. Similarly, the supply voltage Vs must be greater than Vz.
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Answer

A Zener diode is operated in the breakdown region. There is a minimum Zener current, Iz, that places the desired operating point in the breakdown region. There is a maximum Zener current, IzM, at which the power dissipation drives the junction temperature to the maximum allowed. Beyond that current the diode can be damaged. Hence, the supply voltage must be greater than Vz and the current-limiting resistor must limit the diode current to less than the rated maxi mum, IzM.

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