3-Handouts_Handout_2e - Zener Diodes Named after Clarence...

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Zener Diodes ± Named after Clarence M. Zener (1905 - 1993) by Bell Labs. ± Webster’s Dictionary: a silicon semiconductor device used especially as a voltage regulator ± Zener Diode Parameters ± V Z is given at a specified current I ZT ± Δ V=r z Δ I ± r z is the dynamic resistance (Ideally zero) ± V Z in the range of a few volts to a few hundred volts ± V Z =V ZO +r z I z ( I > I ZK ) ± V ZO is the intersection of the linear C/Cs with the voltage-axis V ZK ± I ZK is the minimum current to sustain breakdown operation Circuit symbol for a zener diode. The diode i-v characteristic with the breakdown region shown in some detail. Model for the zener diode.
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Analysis of Diodes in Reverse Breakdown Operation Choose 2 points (0V, -4 mA) and (-5 V, -3 mA) to draw the load line.It intersects with i-v characteristic at Q-point (-2.9 mA, -5.2 V). Using piecewise linear model : D I D V 5000 20 + = Using load-line analysis: 0 > = D I Z I mA 94 . 2 5100 V ) 5 20 ( 0 5 5100 20 = Ω
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This note was uploaded on 01/16/2010 for the course EE ee203 taught by Professor Electronics1 during the Spring '09 term at King Fahd University of Petroleum & Minerals.

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3-Handouts_Handout_2e - Zener Diodes Named after Clarence...

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