First slide

Application of p-n junction diode rectifier

Question

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 ?

Moderate

A

0 mA, 180 mA
B

5 mA, 110 mA
C

10 mA, 55 mA
D

60 mA, 180 mA

Solution

Current from source is
$I = (9 - 6) / 50 = . 06 A$
= 60 mA
$Now, I_{z min} = 5 mA and$
$I_{z max} = P_{max} / Vz = 300 mW / 6 V = 50 mA$
So,
$L_{max} = I - I_{z min} = 60 mA - 5 mA = 55 mA$
And
$L_{min} = I - I_{z max} = 60 mA - 50 mA = 10 mA$

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