A characteristic zener diode for general purpose electronic circuits has the power rating of 500mW, BZX55 zener diode series or the larger 1.3W, BZX85 zener series are most commonly used zener diodes. The figure below shows the circuit arrangement of the Zener diode as a regulator. Circuit design V-I Characteristics of Zener Diode created by gowri sankar Physics with Tinkercad The forward characteristics of zener diode is similar to that of ordinary pn junction diode. (a) I-V Characteristics of Zener diode: (b) Zener diode as a Voltage Regulator . Do check out – V-I characteristics of PN Junction Diode It is driven by a current source. This is to compensate for the damage that occurs in the case of a pn junction diode when the reverse bias exceeds the breakdown voltage and thereby current increases at a rapid rate.. What Is Zener Diode Operation Principle Types Uses Of Zener The circuit diagram of the diode tester here is made of simple transistors and resistors. In the first circuit, the D1 diode is forward biased and permitting the flow of current through the circuit. In the reverse bias condition the Zener diode is an open circuit and only a small leakage current is flowing as shown on the exaggerated plot. In the above circuit diagram excess voltage (Vin – Vz) will drop across Rs thus by limiting the current through Zener. A graph of current through vs the voltage across the device is called the characteristic of Zener diode.The first quadrant is the forward biased region. Forward Biased PN Junction Diode. The reverse biasing means the n-type material of the diode is connected to the positive terminal of the supply and the P-type material is connected to the negative terminal of the supply. The typical forward voltage at room temperature with a current of around 1 mA is around 0.6 volts. Zener diodes are a special type of semiconductor diode– devices that allow current to flow in one direction only –that also allow current to flow in the opposite direction, but only when exposed to enough voltage. Precaution. V z = V L is a constant dependent on the zener diode. Zener diode is significant to use in breakdown region. If this resistor is not used the diode will be damaged due to high current. Zener Diode V-I Characteristics Curve As per the above analysis, it is evident that during forwarding bias Zener diode characteristics will remain the same as that of the normal diode. The breakdown voltage of a Zener diode can be set by controlling the doping level. The forward bias region of a Zener diode is identical to that of a regular diode. The negative feedback taken from the output is connected to the inverting pin of the op-amp through a voltage divider. Zener Diode Characteristics. In the above circuit, the Zener diode of Zener Voltage V Z is connected across the load R L in reverse condition. The circuit diagram to plot the VI characteristics of a zener diode is shown. The output across the diode will be constant. The Zener Diode is used in its “reverse bias” or reverse breakdown mode, i.e. When a diode is connected in a Forward Bias condition, a negative voltage is applied to the N-type material and a positive voltage is applied to the P-type material. Characteristics of a zener diode. 3. the diodes anode connects to the negative supply. The following circuit shows the way Zener Diode can be used as the Voltage Regulator. Note: V i n > V z is a necessary condition for the zener diode to work as a voltage regulator. Whereas after the applied voltage crosses the value of Zener voltage (Vz ) the Zener breakdown takes place. 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