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CRN 12754 \ (20) =\5bln a904 (Spring 2011) Test #3 Question #1 (50 points): Suppose that AC power is available from a 110 V mms source operating at 60 Hz. Design a half-wave rectifier that delivers a maximum voltage of 12 V (with a ripple of ‘ no more than 2 V) and J, = 10 mA to a resistive load, Ry. Assume diode parameters of V,,, = 0,7 V and Ra = 0, Determine the maximum instantaneous power dissipated in the diode (i) just after the power supply is tumed on and (ii) once the output voltage is in steady state. Compare these values to the average power dissipation in the diode. Draw the circuit diagram for your design and specify the values of all components (including the breakdown voltage rating of the diode). Question #2 (50 points): Design a voltage regulator that delivers 9 V to a load represented by a car radio. Assume the circuit is powered by a source for which the voliage, Vs, may vary from 10 to 12 V. This circuit should consist of a series resistor, Rs, and a Zener diode (with Rz = 0) connected in the appropriate manner to the source and the radio. The power dissipated in the Zener diode must not exceed 0.1 W. Draw the circuit diagram for your design and specify the values of all components. The equivalent load resistance of the radio may vary in magnitude from Ry (min) to an open circuit. Determine the value of Ri (min) that ensures the load voltage - does not “drop out of regulation.” March 3, 2011 
