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In the figure below, the voltage V1 ranges from 15 to 35V. The load current is 20mA. The diode knee current is 2 mA, the breakdown voltage is 5V and power rating is 200 mW. Calculate the range of R2 for the circuit to behave properly as a regulator.

In the figure below, the voltage V1 ranges from 15 to 35V. The load current is 20mA. The diode knee current is 2 mA, the breakdown voltage is 5V and power rating is 200 mW. Calculate the range of R2 for the circuit to behave properly as a regulator. Correct Answer 454Ω =< R2 =< 500Ω

IS >= IL + IZmin IS >= 22mA IZmax = 200mW/5 = 40 mA. V1 is minimum, IS >= IZmin + IL V1-5/R2 >= 22mA R2 <= 454 Ω IS =< IZmax + IL when VS is maximum V1-5/R2 =< 60mA R2 >= 500 Ω Hence 454Ω =< R2 =< 500Ω.

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