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Question 4.16: Finding the temperature effect of a zener regulator with PSp...

Finding the temperature effect of a zener regulator with PSpice/SPICE The zener voltage of the regulator in Fig. 4.26(a) is V_{ Z }=4.7 V . The current-limiting resistance R_{ s } is 1 kΩ, and the load resistance R_{ L } is very large, tending to infinity. The supply voltage v_{ S } varies from 0 to 20 V. Use PSpice/SPICE to plot the output voltage v_{ O } against the input voltage v_{ S } for junction temperatures T_{ j }=25^{\circ} C \text { and } T_{ j }=100^{\circ} C . Assume PSpice/SPICE model parameters of zener diode D1N750:

IS=880.5E-18  N=1  CJO=175P  VJ=.75  BV=4.7  IBV=20.245M

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The zener diode regulator for PSpice simulation is shown in Fig. 4.35. The PSpice plots of the output voltage v_{O} against the supply voltage v_{ S } are shown in Fig. 4.36, which shows that the junction temperature affects the zener voltage slightly. For example, at v_{ S }=5 V , v_{ O }=4.2336 V at 25°C and 4.2285 V at 100°C.

Screenshot 2021-10-20 140720
Screenshot 2021-10-20 140720

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