The Zener diode in the voltage regulator below is specified as a 12 V Zener. In parts (a-c), you may assume that rz 0 ohm. The input voltage is in the range Vin = 18 V +-10% and the load current is in the range 0 < IL < 50 mA. Solve for R such that the minimum Zener diode current is IZmin – 5 mA. Find the maximum power dissipation on the Zener diode, Pzmax, for the specified range of Vin and I_L, and the R selected in part (a). Given Vin = 18 V, and lL = 50 mA, find efficiency eta = Pout/Pin of the voltage regulator. Taking into account that rz = 5 ohm, find the load regulation DeltaVout/DeltaIL and the line regulation DeltaVout/DeltaVin for the voltage regulator.

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