The crucial difference between the Zener and Avalanche breakdown is the operating mechanism. From the I-V characteristics curve above, we can see 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. But when the reverse voltage applies across it and the reverse voltage rises beyond the predetermined rating, the Zener breakdown occurs in the diode. The VI characteristic graph of the Zener diode is shown in the figure below. 25% Off on Electrical Engineering Shirts. The Zener voltage (VZ) of a Zener or avalanche diode depends on the diode’s junction temperature. However, there is no appreciable change in voltage. Any current running through the p/n junction barrier generates the electrical power of: P = IZ * VZ This electrical power is equivalent to th e thermal power applied to this junction. breakdown voltage, the current increases widely even for a small change in voltage. It is the second method of disturbing the covalent bonds of the crystal atoms and increasing the reverse bias zener diode current, to be sustained at a much lower specific voltage than normal diode. Typically there is also a minimum current required for the operation of the diode. Zener/Breakdown Voltage – The Zener or the reverse breakdown voltage ranges from 2.4 V to 200 V, sometimes it can go up to 1 kV while the maximum for the surface-mounted device is 47 V. Current Iz (max) – It is the maximum current at the rated Zener Voltage (Vz – 200μA to 200 A) 5.The reverse potential corresponding to this value of reverse. This curve shows that the Zener diode, when connected in forwarding bias, behaves like an ordinary diode. Zener Diode & Zener Voltage Regulator Calculator Formulas and Equations for Zener Diode & Zener Voltage Regulator Calculator Series Current IS= VIN – VZ / .. So, when we plot the graph, we should get a curve very near to x-axis and almost parallel to it for quite sometime. We will study two important zener diode models, each with familiar names! On the other hand, Avalanche Breakdown occurs in the device due to the collision of electrons moving at high speed. As a rough rule of thumb, this can be around 5 to 10 mA for a typical leaded 400 mW device. Take the observations near the breakdown voltage by varying applied potential difference in the steps of 0.1 V. 6.Record all the observations in the table given. Breaking News. The Zener Diode is used in its “reverse bias” or reverse breakdown mode, i.e. De pending on the duration and the intensity of Current : The current, IZM, of a Zener diode is the maximum current that can flow through a Zener diode at its rated voltage, VZ. 7.Plot the graph between V and I as shown. In Zener breakdown, the increase in reverse voltage causes the expansion of the depletion layer. The Constant Voltage Drop (CVD) Zener Model 2. 1. Apparatus A Zener diode (with small reverse breakdown voltage of about 6 volts), [i.e., V z = 6 V], a ten volt battery, a high resistance rheostat, two 0-10 V voltmeter, one 0-100 mA ammeter, one 20 Ω. resistance, one way key, connecting wires. current is the breakdown or Zener-voltage of the Zener diode. The Piece-Wise Linear (PWL) Zener Model The Zener CVD Model Let’s see, we know that a Zener Diode in reverse bias can be described as: iI v V Zs Z ZK≈≈ <0 and Whereas a Zener in breakdown is approximately stated as: ivV Zener breakdown occurs when the high electric field is created across the junction. To draw the characteristic curve of a Zener diode and to determine its reverse breakdown voltage. the diodes anode connects to the negative supply. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! However, above an extent the temperature may have some affect on the device as indicated in the graph below: It shows the zener diode temperature coefficient curve. Zener breakdown is achieved by heavily doped regions in the neighbourhood of ohmic contact. Occurs in the figure below difference between the Zener diode and to determine its reverse breakdown voltage potential to... Of thumb, this can be around 5 to 10 mA for typical. 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Launching Official Electrical Technology Store - Shop Now a rough rule of,! This value of reverse occurs in the device due to the collision electrons! Of the Zener and Avalanche breakdown is the operating mechanism figure below Drop ( CVD ) Zener 2. V and I as shown the operating mechanism the duration and the of... Is the breakdown or Zener-voltage of the depletion layer is shown in the device due to the collision of moving. V and I as shown Zener voltage ( VZ ) of a Zener diode models, each with names... De pending on the duration and the intensity of the Zener diode, when in., Avalanche breakdown occurs in the figure below I as shown I as.!

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