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Determine the maximum and minimum values of load current for which the Zener diode shunt regulator will maintain regulation when VIN=24V and R=500Ω. The Zener diode has a VZ=12V and (IZ)MAX=90mA.

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Determine the maximum and minimum values of load current for which the Zener diode shunt regulator will maintain regulation when VIN=24V and R=500Ω. The Zener diode has a VZ=12V and (IZ)MAX=90mA.

(a) 40mA, 0mA respectively

(b) 36mA, 5mA respectively

(c) 10mA, 6mA respectively

(d) 21mA, 0mA respectively

I got this question in an interview for internship.

My question comes from Voltage Regulation Using Zener Diode topic in chapter Application of Diodes of Electronic Devices & Circuits

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The correct answer is (d) 21mA, 0mA respectively

The best I can explain: The current through the resistance R is given by, I=(VIN-VZ)/R= (24-12)/500=24mA. (IL)MAX=I-(IZ)MIN=24-3=21mA .This current is less than (IZ)MAX. So, we assume that all the input current flows through the Zener diode. Under this condition,  (IL)MIN is 0mA.

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