ECE 202-EEE206(3)

ECE 202-EEE206(3) - ECE 202-EEE206 Experiment no. 3 Study...

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Experiment no. 3 Study of Zener diode Theoretical Background: The diodes we have studied before do not operate in the breakdown region because this may damage them. A Zener diode is different it is a silicon diode that the manufacturer has optimized for operation in the breakdown region. It is used to build voltage regulator circuits that hold the load voltage almost constant despite large change in line voltage and load resistance. Figure shows the symbol of Zener diode. F i g ; S y m b o l o f Z e n e r d i o d e I-V Characteristic curve: The Zener diode may have a breakdown voltage from about 2 to 200 V. These diodes can operate in any of the three regions: forward, leakage and breakdown. Figure shows the I- V graph of Zener diode. In the forward region it works as an ordinary diode. In the leakage region (between zero and breakdown) it has only a small reverse saturation current. In the breakdown region it has a sharp knee, followed by an almost vertical increase in current without changing the voltage. The voltage is almost constant, approximately equal to Vz over most of the
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ECE 202-EEE206(3) - ECE 202-EEE206 Experiment no. 3 Study...

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