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Chapter 21

Chapter 21. Zener Diodes. Objectives. After completing this chapter, you will be able to: Describe the function and characteristics of a zener diode Draw and label the schematic symbol for a zener diode Explain how a zener diode operates as a voltage regulator. Objectives (cont’d.).

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Chapter 21

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  1. Chapter 21 Zener Diodes

  2. Objectives • After completing this chapter, you will be able to: • Describe the function and characteristics of a zener diode • Draw and label the schematic symbol for a zener diode • Explain how a zener diode operates as a voltage regulator

  3. Objectives (cont’d.) • Describe the procedure for testing zener diodes

  4. Zener Diode Characteristics • Zener diode • Operates at voltages that exceed breakdown voltage • Manufactured with a specific breakdown voltage (EZ) • Packaged like PN junction diodes • Power dissipation • Based on temperature and lead lengths

  5. Zener Diode Characteristics (cont’d.) Figure 21-1. Zener diode packages.

  6. Zener Diode Characteristics (cont’d.) Figure 21-2. Schematic symbol for a zener diode.

  7. Zener Diode Ratings • Positive zener voltage-temperature coefficient • Breakdown voltage increases as temperature increases • Negative zener voltage-temperature coefficient • Breakdown voltage decreases as temperature increases

  8. Voltage Regulation with Zener Diodes Figure 21-3. Typical zener diode regulator circuit.

  9. Voltage Regulation with Zener Diodes (cont’d.) Figure 21-4. Zener diode voltage regulator with load.

  10. Testing Zener Diodes Figure 21-5. Setup for testing zener diode regulation.

  11. Summary • Zener diodes are designed to operate at voltages greater than the breakdown voltage (peak reverse voltage) • The breakdown voltage of a zener diode is determined by the resistivity of the diode • Zener diodes are used to stabilize or regulate voltage

  12. Summary (cont’d.) • Zener diode regulators provide a constant output voltage despite changes in the input voltage or output current • To determine whether a zener diode is regulating at the proper voltage, a regulation test must be performed

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