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Q.

A zener diode in the circuit shown has a knee current of 5 mA and a maximum allowed power dissipation of 300 mW. What are the minimum and maximum load currents that can be drawn safely from the circuit, keeping the output voltage V0 constant at 6 volts ?

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a

0 mA, 180 mA

b

5 mA, 110 mA

c

10 mA, 55 mA

d

60 mA, 180 mA

answer is C.

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Detailed Solution

Current from source isI=(9−6)/50=.06A= 60 mA Now, Izmin=5mA and Izmax=Pmax/Vz=300mW/6V = 50 mASo,Lmax=I−Izmin=60mA−5mA = 55 mAAndLmin=I−Izmax=60mA−50mA = 10mA

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