4. Determine the average ac resistance for the diode of Fig. 2.1 for the region between 0.6 V and 0.9 V. 5. Determine the temperature coefficient of a 5-V Zener diode (rated 25°C value) if the nominal voltage drops to 4.8 V at a temperature of 100°C.
4. Determine the average ac resistance for the diode of Fig. 2.1 for the region between 0.6 V and 0.9 V. 5. Determine the temperature coefficient of a 5-V Zener diode (rated 25°C value) if the nominal voltage drops to 4.8 V at a temperature of 100°C.
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
Related questions
Question
Solving points 4 and 5
Transcribed Image Text:H.W
1. a. Determine the thermal voltage for a diode at a temperature of 20°C.
b. For the same diode of part (a), find the diode current using Eq. 2.1
if I, = 40 nA, n = 2 (low value of V and the applied bias voltage
is 0.5 V.
2. Determine the static or dc resistance of the commercially available
diode of Fig. 1 at a forward current of 4 mA.
3. a. Determine the dynamic (ac) resistance of the commercially
available diode of Fig. 2.1 at a forward current of 10 mA using Eq.
(1.5).
b. Determine the dynamic (ac) resistance of the diode of Fig. 2.1 at a
forward current of 10 mA using Eq. (2.5).
c. Compare solutions of parts (a) and (b).
4. Determine the average ac resistance for the diode of Fig. 2.1 for the
region between 0.6 V and 0.9 V.
5. Determine the temperature coefficient of a 5-V Zener diode (rated
25°C value) if the nominal voltage drops to 4.8 V at a temperature of
100°C.
-40 -30 -20 -10
Reverse-bias region
(VD<0 V. Ip=-1,)
ID = IeVD/nVT
20+
19-
18-
17
16
15-
14
13-
12-
11-
10-
-9
-8-
-7-
6
-4-
ID (mA)
Eq. (1.1)
10 PA
20 PA
30 PA
40 PA
-50 PA
0.3
(VD positive)
0.5 0.7
Actual commercially
available unit
No-bias
(Vp=0V. Ip=0 mA)
Defined polarity and
direction for graph
+
Forward-bias region
(VD>0V, Ip>0 mA)
Fig. 2.1 Silicon semiconductor diode characteristics.
VD (V)
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