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a) To what value R must be adjusted in the following circuit to make IZ = 70 mA. Assume VZ =20 V at 65 mA and ZZ = 23 Ω. What is the Zener voltage at 70o C, if it has a positive TC of 0.08 %/oC.?

a) To what value R must be adjusted in the following circuit to make IZ = 70 mA. Assume VZ =20 V at 65 mA and ZZ = 23 Ω. What is the Zener voltage at 70o C, if it has a positive TC of 0.08 %/oC.?

Electric Motor Control
Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
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a) To what value R must be adjusted in the following circuit to make IZ = 70 mA. Assume VZ =20 V at 65 mA and ZZ = 23 Ω. What is the Zener voltage at 70o C, if it has a positive TC of 0.08 %/oC.? b) Using a Complete diode model, find the diode current (ID), diode voltage (VD), and output voltage (Vo) for the diode circuit shown below. Given that: Vs = 20 V, RL=3 kΩ , Barrier Potential VF = 0.3 V , and r’d = 70 Ω. If the diode was reversed and IR = 200 µA, Determine the diode reverse voltage (VR)
a) To what value R must be adjusted in the following dircuit to make L 70 mA. Assume V, =20 V at 65 mA and Z, = 23 Q. What is the Zener voltage at 70 C, if it has a positive TC of 0.08 %/C.? R 24 V b) Using a Complete diode model, find the diode current (I,), diode voltage (V,), and output voltage (Vo) for the diode circuit shown below. Given that: V = 20 v, R =3 kQ , Barrier Potential V. = 0.3 V, and r', = 70 Q. If the diode was reversed and I, = 200 uA, Determine the diode reverse voltage (V,) + VD - lo RL Vo Vs
Transcribed Image Text:a) To what value R must be adjusted in the following dircuit to make L 70 mA. Assume V, =20 V at 65 mA and Z, = 23 Q. What is the Zener voltage at 70 C, if it has a positive TC of 0.08 %/C.? R 24 V b) Using a Complete diode model, find the diode current (I,), diode voltage (V,), and output voltage (Vo) for the diode circuit shown below. Given that: V = 20 v, R =3 kQ , Barrier Potential V. = 0.3 V, and r', = 70 Q. If the diode was reversed and I, = 200 uA, Determine the diode reverse voltage (V,) + VD - lo RL Vo Vs
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