In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. The minimum value of the resistance required, if the maximum zener current is 90 m

Question

In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. The minimum value of the resistance required, if the maximum zener current is 90 mA will be Ω.

TestHub · Accepted Answer

Voltage across, R L = 5 V ⇒ i 2 = 5 R L Also, voltage across R = 50 - 5 = 45 volt v = i R ⇒ R = v i = 45 i i + i 2 R = 45 90 m A + 5 R L Current in zener diode is maximum when R L → ∞ i 2 → 0 and i i = i So R = 45 90 mA = 500 Ω

Physics - Semiconductors Question with Solution | TestHub

Doubts & Discussion