*27. a. Given Pmax = 14 mW for each diode at Fig. 172, determine the maximum current rating of each diode (using the approximate equivalent model). b. Determine Imax for the parallel diodes. c. Determine the current through each diode at V using the results of part (b). d. If only one diode were present, which would be the expected result?

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Chapter59: Motor Startup And Troubleshooting Basics
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Problem 12SQ: How is a solid-state diode tested? Explain.
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*27. a. Given Pmax = 14 mW for each diode at Fig. 172, determine the maximum current rating of
each diode (using the approximate equivalent model).
b. Determine Imax for the parallel diodes.
c. Determine the current through each diode at V; using the results of part (b).
d. If only one diode were present, which would be the expected result?
Imax
Si
160 V
Si
4.7 k2
68 k2
CIC
27.
(a) Pmax = 14 mW = (0.7 V)I,
14 mW
Ip =
0.7 V
20 mA
(b) Imax = 2 x 20 mA = 40 mA
(c) 4.7 k2 || 68 k2 = 4.4 k2
VR = 160 V – 0.7 V = 159.3 V
159.3 V
= 36.2 mA
%3D
4.4 k2
max
= 18.1 mA
(d) Total damage, 36.2 mA > 20 mA
Transcribed Image Text:*27. a. Given Pmax = 14 mW for each diode at Fig. 172, determine the maximum current rating of each diode (using the approximate equivalent model). b. Determine Imax for the parallel diodes. c. Determine the current through each diode at V; using the results of part (b). d. If only one diode were present, which would be the expected result? Imax Si 160 V Si 4.7 k2 68 k2 CIC 27. (a) Pmax = 14 mW = (0.7 V)I, 14 mW Ip = 0.7 V 20 mA (b) Imax = 2 x 20 mA = 40 mA (c) 4.7 k2 || 68 k2 = 4.4 k2 VR = 160 V – 0.7 V = 159.3 V 159.3 V = 36.2 mA %3D 4.4 k2 max = 18.1 mA (d) Total damage, 36.2 mA > 20 mA
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