7. The Zener diode in the voltage regulator circuit shown in the figure below has the following specifications: VF = 0.7 V, Vz= 12 V, Iz(min) = 0.4 mA, Pz(max) = 360 mW (a) Determine the voltages VRs and VRL (b) Calculate the currents IRS, IRL and Iz (c) Determine the maximum and minimum resistance values of Rs in order to ensure that the Zener diode is operating as a voltage regulator without damage Rs = 3200 18 V IRS VRS N RL= 860 Ω IRL VRL

Compared to an ideal PN diode, what are the different characteristics of a practical PN diode? Please list two different characteristics when the diode is reversed biased.

Determine the minimum value and the maximumvalue that the series resistor may have in a regulatorcircuit whose output voltage is to be 25 V, whose inputvoltage varies from 35 to 40 V, and whose maximumload current is 75 mA. The Zener diode used in thiscircuit has a maximum current ratingof 250 mA.

Q1/ a/Draw the output voltage waveform for the bridge rectifier in this figure : 5:1 D Da 120 V ms Dy RL B/ What PIV rating is required for the diodes in a bridge rectifier that produces an average output voltage of 50 V? Q2/ Determine the minimum input voltage required for regulation to be established in the figure. Assume an ideal zener diode with Izx = 1.5 mA and V, = 14 V. lllee 幸

For each circuit shown below, the input v, is a 60HZ, 12 volt peak sine wave. Sketch the waveform resulting at vo. Assume ideal diodes. What are its positive and negative peak values?

Please find the correct answer by solving the problem

Consider the following circuit diagram. Using practical diode model solve the following items. i. What is the type of rectification in this circuit? ii. Calculate the total peak secondary voltage (Note that “RMS" value is given in the circuit) iii. Sketch the plot of time vs voltage over Load (RL) iv. Find the average voltage over Load. v. Find the maximum current passing over diodes. vi. Find the peak inverse voltage (PIV) over the diodes. vii. Find the minimum fuse current rating for the primary coil. 5:1 D DA 120 V rms D3 D2 RL=10kQ RL out ell lelll

Q2) Explain the working of zener diode on both forward and reverse bias. From the circuit in the Figure-2, Rs=1KO, Vz=7.2V and RL=3KN. If Vs = 12V. Find out the following DC parameters: a) Is = ?, Current passing through resistor Rs b) IL = ?, Current passing through resistor RL c) Iz = ?, Current passing through Zener Diode d) VL= ?, Output Voltage (Figure-2) Rs 1k Ohm Is Iz RL VL Vs UA723_ZD2 .3k Ohm 12 V

For the series diode configuration employing the diode characteristics of Fig. 2.3b determine: (a) VD and IDo (b) VR. E10V Si R w † ½p (mA) 10 9 8 7 6 5 ΙΚΩ 01 0.5 0.8 VD (V)

5) The figure below illustrates a simple voltage threshold detection circuit. To understand how it operates, we will analyze its behavior based on the simple constant voltage drop model for both diodes. Assume the Zener diode (Z1) only conducts when its breakdown voltage of 10V is reached. Di is a red light emitting diode (LED). Assume it conducts after its forward bias voltage of 1.8V is reached. Vin is unknown. Assume Zj acts as a perfect Zener diode (without series resistance). What voltage does Vin have to reach before there is a current through R¡? What voltage must Vin reach before current flows through R2? Write an equation for the current through Zi in terms of Vin, Rị and R2 that is valid when Vin is high enough for both diodes to be conducting. a. b. c. R2 Vino R1 LED