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The following circuit is provided. Given that V1 varies from 20V to 50V, the diode breakdown voltage is 5V, the knee current is 1mA and the current is 9 mA across R1, find the maximum value of R2.

The following circuit is provided. Given that V1 varies from 20V to 50V, the diode breakdown voltage is 5V, the knee current is 1mA and the current is 9 mA across R1, find the maximum value of R2. Correct Answer 1500Ω

IS >= IZmin + IL IS >= 10mA V1-5/R2 >= 10mA R2 =< V1-5/10-2 Thus R2 =< 1500Ω when V1 = 20V And R2 =< 4500Ω when V1 = 50V Hence R2 =< 1500Ω.

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