Question 141: Semiconductors and Logic Gates

Question

Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the
unregulated input voltage varies between 10 V to 16 V, then what is maximum Zener current?
![](https://imagex.cdn.examgoal.net/jf762wkjy3s6t03/60078bcc-45e6-4dc7-9464-0a8521a728c8/fc61ea30-a6a9-11e9-902e-23ffedc9804e/file-jf762wkjy3s6t04.png)

Accepted Answer

${I_L} = {{{V_Z}} \over {{R_L}}}$
= ${{6\,V} \over {4\,k\Omega }}$ = 1.5 mA
Let input voltage = V
$ 	herefore $ ${{V - {V_Z}} \over {{R_S}}} = {I_s}$
Here maximum input voltage = 16 V
$ 	herefore $ ${{16 - 6} \over {2\,k\Omega }} = {I_s}$
$ \Rightarrow $ I
S
= 5 mA
$ 	herefore $ I
Z
= I
S
- I
L
= 5 - 1.5 = 3.5 mA
![](https://imagex.cdn.examgoal.net/jf762wkjy3scb97/0cef265b-57a9-4b4b-84af-c1a25234e538/95873cb0-a6aa-11e9-902e-23ffedc9804e/file-jf762wkjy3scb98.png)

Answer

3.5 mA

Answer

1.5 mA

Answer

2.5 mA

Answer

7.5 mA

Semiconductors and Logic Gates

Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input voltage varies between 10 V to 16 V, then what is maximum Zener current?

Choose the correct answer: