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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

5 mA, 110 mA

b

60 mA, 180 mA

c

10 mA, 55 mA

d

0 mA, 180 mA

answer is C.

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Detailed Solution

Current from source is

I=(9−6)/50=.06A

= 60 mA

 Now, Izmin=5mA and 

Izmax=Pmax/Vz=300mW/6V = 50 mA

So,

Lmax=I−Izmin=60mA−5mA = 55 mA

And

Lmin=I−Izmax=60mA−50mA = 10mA

 

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