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Determine the minimum value of load resistance that can be used in the circuit with (IZ)Min=3mA. The input voltage is 10V and the resistance R is 500Ω. The Zener diode has a VZ=6V 0and (IZ)MAX=90mA.

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Determine the minimum value of load resistance that can be used in the circuit with (IZ)Min=3mA. The input voltage is 10V and the resistance R is 500Ω. The Zener diode has a VZ=6V 0and (IZ)MAX=90mA.

(a) 1KΩ

(b) 2.4KΩ

(c) 1.2KΩ

(d) 3.6KΩ

I got this question at a job interview.

The doubt is from Voltage Regulation Using Zener Diode in portion Application of Diodes of Electronic Devices & Circuits

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Right option is (c) 1.2KΩ

Best explanation: The I=(VIN-VZ)/R=(10-6)/500=8mA. (IL)MAX=I-(IZ)MIN=8-3=5mA. (RL)MIN=VZ/(IL)MAX=6/5m=1.2KΩ.

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