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?

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

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: