Is = Izmin + ILmax We are going use it's reverse breakdown characteristics. The zener diode voltage regulator is based on a particular characteristic of zener diodes. 3(b) to charge a rechargeable battery of voltage V8 = 10V. What value of zener diode and sereis resistance should be used to produce the desired output? IS            Current passing through the series resistance To find the value of Rsmin we should consider the extreme condition that Vin is minimum and load current is maximum. Can someone please help me out with a circuit that converts 220 v ac to 5 v dc but strictly doesn’t contain any ics. The zener diode shunt is very economic as it is of low cost. Because the power supply is 6V. When the zener diode is operated in the breakdown or zener region, the voltage across it is substantially constant for a large change of current through it. The zener diodes have a voltage rating equivalent to the intended output voltage, that may be closely match the desired output value. ; It requires only two or three components. Beyond that current the diode can be damaged. Basically there are two type of regulations such as: In this type of regulation, series resistance and load resistance are fixed, only input voltage is changing. The function of a regulator is to provide a constant output voltage to a load connected in parallel with it in spite of the ripples in the supply voltage or the variation in the load current and the zener diode will continue to regulate the voltage until the diodes current falls below the minimum IZ(min)value in the reverse breakdown region. 07Sahil . Voltage regulator is a circuit which outputs constant voltage irrespective of the input the voltage. Circuit Graph. Then we can select a Zener diode with a breakdown voltage of 12 volts and connect it across the load. A voltage regulator is a system designed to automatically maintain a constant voltage level. This breakdown point is referred as “Zener voltage”. With an ideal Zener diode, construction of a voltage regulator is easy, simply connect the diode between the unregulated voltage and ground. And it is this characteristic of a zener diode that permits it to be used as a voltage regulator. Circuit of Zener One Zener Diode connected with one resistence and battery. For deciding Rs and RL, I need to know Izmax and Izmin of the zener diode 1N4736A used. We have discussed the application of Zener diode as voltage regulator and now we will discuss the other two points. 8V. This breakdown occurs due to the high electric field density across the depletion region breaks some of the covalent bonds leading to large number of minority carriers. Voltage regulator is a circuit which outputs constant voltage irrespective of the input the voltage. Izmax = Pmax/Vz Since the exploited property of Zener diodes is the reversebreakdown voltage, connect the anode of the diode to ground, not the cathode. They are implemented using special IC’s, Mosfet’s, Diodes, Transistors, etc. Its characteristics are otherwise very similar to common diodes. Figure. From the I-V Characteristics curve we can study that the zener diode has a region in its reverse bias characteristics of almost a constant negative voltage regardless of the value of the current flowing through the diode and remains nearly constant even with large changes in current as long as the zener diodes current remains between the breakdown current IZ(min) and the maximum current rating IZ(max). The R1 resistor is connected to the Zener Diode in series. Overview: Zener diode is a special type of Diode specifically designed to operate in reverse biased mode. This may damage the diode due to excess heat produced by the high current flow through the diode unless the current is limited. Rsmax = Vs/Is. A typical Zener diode shunt regulator is shown in Figure 3. Zener diodes have voltage values from less than 2 volts to several hundred volts, and they can dissipate power ranging from 0.25 to 50 watts… or more. For example, a 5.6 V, 0.5 W zener diode has a recommended reverse current of 5 mA. 1. The Zener Diode is used in its "reverse bias". 4V. As the zener diode is connected parallel to the load the voltage across the load will be always equal to the zener voltage. Zener Diode as a voltage. The output of the transformer is then rectified using a diode bridge and smoothened using a capacitive filter. Output volt remains same, as long as the load resistance is maintained above a minimum value. 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