Question 138: Semiconductors and Logic Gates

Question

The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener
diode is 6 V and the load resistance is, RL = 4k$$\Omega $$. The series resistance of the circuit is Ri
 = 1 k$$\Omega $$. If the
battery voltage VB varies from 8 V to 16 V, what are the minimum and maximum values of the current
through Zener diode?

Accepted Answer

V
breakdwon
= 6V, RL = 4k$$\Omega $$, R
i
= 1 k$$\Omega $$
$${i_L} = {6 \over 4} 	imes {10^{ - 3}} = 1.5 	imes {10^{ - 3}} = 1.5\,mA$$
i
i
= 2 ÃÂ 10
Ã¢ÂÂ3
i = i
1
Ã¢ÂÂ i
L
= 0.5 mA Ã¢ÂÂ minimum current
i
i
= 10 ÃÂ 10
Ã¢ÂÂ3
= 10 mA
i
max
= 8.5 mA

Answer

0.5 mA; 8.5 mA

Answer

1.5 mA; 8.5 mA

Answer

1 mA; 8.5 mA

Answer

0.5 mA; 6 mA

Semiconductors and Logic Gates

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