• FIGURE 3-69 I8 V 8. To what value must R be adjusted in Figure 3–69 to make /a Vz = 12 V at 30 mA and Zz = 30 N. plied to tbe circuit in Ficur
• FIGURE 3-69 I8 V 8. To what value must R be adjusted in Figure 3–69 to make /a Vz = 12 V at 30 mA and Zz = 30 N. plied to tbe circuit in Ficur
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I need solution of all these numerical on urgents basics. Actually, i am preparing for them just I want soltion of these numerical
Transcribed Image Text:14. In a certain zener regulator, the output voltage changes 0.2 V when the input voltage goes from
10. A loaded zener regulator is shown in Figure 3–70. Vz = 5.1 V at lz = 49 mA, Izk = I mA,
Zz = 7 N, and Izm = 70 mA. Determine the minimum and maximum permissible load
source. Draw the output waveform. Use the parameter values established in Problem 8.
9. A 20 V peak sinusoidal voltage is applied to the circuit in Figure 3–69 in place of the de
SPECIAL-PURPOSE DIODES
P FIGURE 3-69
R
18 V
= 40 mA? Assume
8. To what value must R be adjusted in Figure 3–69 to make l,
Vz
= 12 V at 30 mA and Zz = 30 N.
currents.
R
• FIGURE 3-70
Multisim file circuits are identified
22 N
with a logo and are in the Problems
folder on the companion website.
Filenames correspond to figure
numbers (e.g., F03-70).
IN4733A
11. Find the load regulation expressed as a percentage in Problem 10. Refer to Chapter 2. Equation
2-15.
12. Analyze the circuit in Figure 3–70 for percent line regulation using an input voltage from 6 V
to 12 V with no load. Refer to Chapter 2, Equation 2–14.
13. The no-load output voltage of a certain zener regulator is 8.23 V, and the full-load output is
7.98 V. Calculate the load regulation expressed as a percentage. Refer to Chapter 2. Equano
2-15.
SV to 10 V. What is the input regulation expressed as a percentage? Refer to Chapter .
Equation 2-14.
load regulation expressed as a percentage. Refer to Chapter 2, Equation 2–15.
Section 3-3
The Varacdas ni.
Transcribed Image Text:PROBLEMS
• 163
Answers to all odd-numbered problems are at the end of the book.
BASIC PROBLEMS
PROBLEMS.
The Zener Diode
Section 3–1
1. A certain zener diode has a Vz = 7.5 V and an Z, = 5 N at a certain current. Draw the equiv-
alent circuit.
2. From the characteristic curve in Figure 3–67, what is the approximate minimum zener current
(Izk) and the approximate zener voltage at Izk?
• FIGURE 3-67
Vz (V) +
-10 -9 -8 -7
-3 -2 -1
4
5
7
8
9
10
11
12
13 .
Iz (mA)
3. When the reverse current in a particular zener diode increases from 20 mA to 30 mA, the zener
voltage changes from 5.6 V to 5.65 V. What is the impedance of this device?
4. A zener has an impedance of 15 N. What is its terminal voltage at 50 mA if Vz = 4.7 V at
Iz = 25 mA?
A certain zener diode has the following specifications: Vz = 6.8 V at 25°C and TC =
+0.04%/°C, Determine the zener voltage at 70°C.
Section 3-2 Zener Dlode Applications
6. Determine the minimum input voltage required for regulation to be established in Figure 3–68.
Assume an ideal zener diode with Izx = 1.5 mA and V7 = 14 V.
• FIGURE 3-68
560 N
7. Repeat Problem 6 with Zz = 20 N and Vz = 14 V at 30 mA.
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