Question
Which of the following statements is incorrect for a
Zener diode in breakdown region?Solution
In the breakdown region of a Zener diode, the voltage across the diode stays nearly constant at the Zener breakdown voltage, even if the current through it changes. This property is exploited for voltage regulation. However, once breakdown occurs:
- Reverse current increases rapidly with a small increase in voltage,
- But voltage stays almost constant, due to the Zener effect or avalanche effect (depending on the breakdown voltage),
- Series resistance is externally added to limit the current and avoid thermal damage.
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