Illustrate the general zener diode V-I. Then, analyze the reverse characteristics and operation of zener diode.
Illustrate the general zener diode V-I. Then, analyze the reverse characteristics and operation of zener diode.
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
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Transcribed Image Text:Question 3
(a) Illustrate the general zener diode V-I. Then, analvze the reverse characteristics and
operation of zener diode.
(b) Given datasheet in Table 1. Analvze the 1N4742A voltage across the Zener terminals
when the current is 70 mA with the aid of suitable equivalent circuit.
Table 1: Datasheet for IN4728A – IN4764A Zener Diode
Electrical Characteristics T,- 29°C unles otherwise noted
Vz (V) @ Iz (Note 1)
Max. Zener Impedance
Zz @Iz Zzk @
IR
Izk (2)
Leakage Current
Test Current
Device
Iz (mA)
IZK
(mA)
VR
(V)
Min.
Тур.
Мах.
(1)
(HA)
3.315
3.42
3.705
4.085
4.465
1N4728A
3.3
3.465
76
10
400
100
1N4729A
1N4730A
3.6
3.9
3.78
4.095
69
64
10
400
400
100
50
1
1N4731A
4.3
4.7
4.515
58
400
1
10
1
1N4732A
4.935
53
8.
500
1
10
1
5.355
5.88
1N4733A
4.845
5.1
49
45
7
550
600
10
1N4734A
5.32
5.6
1
10
6.2
6.51
7.14
1N4735A
5.89
41
700
1
10
3
1N4736A
6.46
6.8
37
3.5
700
1
10
1N4737A
7.125
7.5
7.875
34
700
0.5
10
5
700
700
700
700
1N4738A
7.79
8.2
8.61
31
4.5
0.5
10
6
9.555
10.5
1N4739A
8.645
9.5
9.1
10
28
0.5
10
10
1N4740A
1N4741A
25
0.25
7.6
10.45
11
11.55
23
8
0.25
8.4
1N4742A
11.4
12
12.6
21
700
0.25
9.1
(c) Figure 6 shows the Zener regulation with a variable load that used in power supply. Examine
the minimum and maximum load currents to ensure the Zener diode maintain regulation. Also,
Maximum Zener current, Igmax), Minimum value of R1, for the Zener to maintain 12 V.
R
VIN
R,
Figure 6
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