Lecture 5 Special-Purpose Diodes - Zener Diode - LED
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2 Lecture 5 Special-Purpose Diodes - Zener Diode - LED
3 Objectives 1. Describe the characteristics of a Zener diode and analyze its operation 2. Explain how a Zener diode is used in voltage regulation and limiting 3. Discuss the operation and characteristics of LEDs and photodiodes
4 Zener Diode
5 Introduction The basic function of Zener diode is to maintain a specific voltage across its terminals within given limits of line or load change. Typically it is used for providing a stable reference voltage for use in power supplies and other equipment. This particular zener circuit will work to maintain 10 V across the load.
6 A Zener diode is much like a normal diode, the exception being is that it is placed in the circuit in reverse bias and operates in reverse breakdown. This typical characteristic curve illustrates the operating range for a Zener. Note that its forward characteristics are just like a normal diode. Zener Diode
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8 Zener Diodes The Zener diode s breakdown characteristics are determined by the doping process. Low voltage Zener less than 5V operate in the Zener breakdown range. Those designed to operate more than 5 V operate mostly in avalanche breakdown range. Zener are available with voltage breakdowns of 1.8 V to 200 V. This curve illustrates the minimum and maximum ranges of current operation that the Zener can effectively maintain its voltage.
9 1- Zener Equivalent Circuits the ideal model 0f a Zener diode in reverse breakdown and its ideal characteristic curve. It has a constant voltage drop equal to the nominal Zener voltage. This constant voltage drop across the Zener diode produced by reverse breakdown is represented by a dc voltage symbol even though the Zener diode does not produce a voltage.
10 2- Zener Equivalent Circuits the practical model of a zener diode, where the zener impedance (resistance), ZZ, is included. Since the actual voltage curve is not ideally vertical, a change in zener current produces a small change in zener voltage
11 Example 1
12 Example 2
13 Example 2 Sol.
14 Applications Apply a zener diode in voltage regulation Analyze zener regulation with a variable input voltage Discuss zener regulation with a variable load Describe zener regulation from no load to full load
15 Zener Regulation In Zener regulation circuit, the Zener diode will adjust its impedance based on varying input voltages and loads (R L ) to be able to maintain itsdesignated Zener voltage. 1. Zener current will increase or decrease directly with voltage input changes. 2. The Zener current will increase or decrease inversely with varying loads.
16 Zener Regulation with a Variable Input Voltage Zener current will increase or decrease directly with voltage input changes.
17 Zener Regulation with a Variable Input Voltage
18 Zener Regulation
19 Example 3
20 Example 3 sol.
21 Exampl 3 sol.
22 Zener Regulation with a Variable Load A zener voltage regulator with a variable load resistor across the terminals. The zener diode maintains a nearly constant voltage across as long as the zener current is greater than IZK and less than IZM.
23 Example 4
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25 For the circuit in Figure 3 15: (a) Determine VOUT at IZK and at (b) Calculate the value of R that should be used. (c) Determine the minimum value of RL that can be used
26 Zener Limiting Zener diodes can used for limiting just as normal diodes. Recall in previous chapter studies about limiters. The difference to consider for a Zener limiter is its Zener breakdown characteristics.
27 Optical Diodes The Light Emitting Diode (LED) emits photons asvisible light. Its purpose is for indication and other intelligible displays. Various impurities are added during the doping process to change the color output.
28 Optical Diodes The seven segment display is an example of LEDs use for display of decimal digits.
29 Optical Diodes The photo diode is used to vary current by the amount of light that strikes it. It is placed in the circuit in reverse bias. As with most diodes when in reverse bias, no current flows when in reverse bias, but when light strikes the exposed junction through a tiny window, reverse current increases proportional to light intensity.
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