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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 300 mW. What are the minimum and maximum load currents that can be drawn safely from the circuit, keeping the output voltage V0 at 6 V?
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- 0 mA, 180 mA
- 5 mA, 110 mA
- 10 mA, 55 mA
- 60 mA, 180 mA
Correct Option: C
The given circuit (i.e., fig)
Given, IZK = 5 mA, V0 = VZ = 6V, RS = 50 Ω, Vi = 9V
| PZM = 300 mW or IZ(max) = | = | = 64 mA | VZ | 6V |
= 50 mA
| From figure, I S = | = | = | = 60 mA | RS | 50 | 50 |
Now, IL(min) = IS – IZ(max) = 60 – 50 = 10 mA
IL(max) = IS – IZK = 60 – 5 = 55 mA
Hence alternative (C) is the correct choice.
