Question

Q5(a) Figure Q5(a) shows a basic series voltage regulator circuit.\\ (i)\\ (ii)\\ $V_{IN}$\\ $R_{REF}$\\ $Q_1$\\ $U_1$\\ $R_1 = 20 \text{ k}\Omega$\\ $D_1$\\ $R_2 > 30 \text{ k}\Omega$\\ Figure Q5(a)\\ $V_{OUT}$\\ Calculate the output voltage, $V_{OUT}$ if $V_{IN} = 50 \text{ V}$ and voltage drop across\\ $D_1 = 6.2 \text{ V}$.\\ (3 marks)\\ Illustrate a circuit diagram for overload protection between transistor ($Q_1$)\\ and the load.\\ (4 marks)\\ (iii)\\ (b)\\ Based on the answer in Q5(a)(ii), calculate the overload current $I_{L(max)}$.\\ Figure Q5(b) shows a voltage regulator.\\ (3 marks)\\ $+35 \text{ V}$\\ $C_1$\\ LM 317\\ $+V_{out}$\\ $\uparrow$\\ $V_{REO} \quad 220 \Omega$\\ $R_1$\\ $C_3$\\ $I_{ADJ}$\\ $R_2'$\\ $R_2$\\ $C_2$\\ $5 \text{ k}\Omega$\\ (i)\\ Figure Q5(b)\\ Determine the maximum and minimum output voltage for the voltage\\ regulator in Figure Q5(b), if $I_{ADJ} = 25 \mu A$ and $V_{REO} = 0.9 \text{ V}$.\\ (7 marks)\\ (ii) Determine the output voltage of the regulator if $R_2$ is set to 4 kkk.\\ (3 marks)

          Q5(a) Figure Q5(a) shows a basic series voltage regulator circuit.\\
(i)\\
(ii)\\
$V_{IN}$\\
$R_{REF}$\\
$Q_1$\\
$U_1$\\
$R_1 = 20 \text{ k}\Omega$\\
$D_1$\\
$R_2 > 30 \text{ k}\Omega$\\
Figure Q5(a)\\
$V_{OUT}$\\
Calculate the output voltage, $V_{OUT}$ if $V_{IN} = 50 \text{ V}$ and voltage drop across\\
$D_1 = 6.2 \text{ V}$.\\
(3 marks)\\
Illustrate a circuit diagram for overload protection between transistor ($Q_1$)\\
and the load.\\
(4 marks)\\
(iii)\\
(b)\\
Based on the answer in Q5(a)(ii), calculate the overload current $I_{L(max)}$.\\
Figure Q5(b) shows a voltage regulator.\\
(3 marks)\\
$+35 \text{ V}$\\
$C_1$\\
LM 317\\
$+V_{out}$\\
$\uparrow$\\
$V_{REO} \quad 220 \Omega$\\
$R_1$\\
$C_3$\\
$I_{ADJ}$\\
$R_2'$\\
$R_2$\\
$C_2$\\
$5 \text{ k}\Omega$\\
(i)\\
Figure Q5(b)\\
Determine the maximum and minimum output voltage for the voltage\\
regulator in Figure Q5(b), if $I_{ADJ} = 25 \mu A$ and $V_{REO} = 0.9 \text{ V}$.\\
(7 marks)\\
(ii) Determine the output voltage of the regulator if $R_2$ is set to 4 kkk.\\
(3 marks)

Q5(a) Figure Q5(a) shows a basic series voltage regulator circuit.

(i)

(ii)

VIN

RREF

Q1

U1

R1 = 20 kΩ

D1

R2 > 30 kΩ

Figure Q5(a)

VOUT

Calculate the output voltage, VOUT if VIN = 50 V and voltage drop across

D1 = 6.2 V.

(3 marks)

Illustrate a circuit diagram for overload protection between transistor (Q1)

and the load.

(4 marks)

(iii)

(b)

Based on the answer in Q5(a)(ii), calculate the overload current IL(max).

Figure Q5(b) shows a voltage regulator.

(3 marks)

+35 V

C1

LM 317

+Vout

↑

VREO 220 Ω

R1

C3

IADJ

R2'

R2

C2

5 kΩ

(i)

Figure Q5(b)

Determine the maximum and minimum output voltage for the voltage

regulator in Figure Q5(b), if IADJ = 25 μ A and VREO = 0.9 V.

(7 marks)

(ii) Determine the output voltage of the regulator if R2 is set to 4 kkk.

(3 marks)

Added by Jennifer P.

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