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A zener diode in the circuit shown in the figure below, has a knee current of 5 mA. and a maximum allowed power dissipation of 330 mW. What are the minimum and maximum load currents that can be drawn safely from the circuit, keeping the output voltage V0 at 6V?


  • a)
    0mA, 180mA

  • b)
    5mA, 110 mA

  • c)
    10 mA, 55 mA

  • d)
    60 mA, 180 mA

Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A zener diode in the circuit shown in the figure below, has a knee cur...
Given, IZ (min) = 5 mA

V0 = 6 V = Vz

(according to given condition).

Maximum power dissipation means maximum zener current

i.e. Iz (max) = Pmax V = 300 mW 6 V = 50 mA

from figure

I = Vin – Vz 50 = 9 – 6 50 = 60 mA

and I = IZ + IL

IL (min) = I – I(max) = 60 – 50 = 10 mA

IL (max) = I – Iz (min) = 60 – 5 = 55 mA

Hence alternative (C) is the correct choice.
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A zener diode in the circuit shown in the figure below, has a knee cur...
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Community Answer
A zener diode in the circuit shown in the figure below, has a knee cur...

Maximum load current = (60 - 5) m 
A = 55mA
Now,

lL min = 60 mA - 50 mA = 10mA
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A zener diode in the circuit shown in the figure below, has a knee current of 5 mA. and a maximum allowed power dissipation of 330 mW. What are the minimum and maximum load currents that can be drawn safely from the circuit, keeping the output voltage V0 at 6V?a)0mA, 180mAb)5mA, 110 mAc)10 mA, 55 mAd)60 mA,180 mACorrect answer is option 'C'. Can you explain this answer?
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