ZENER Diode - 3

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ZENER DIODE LIKE VOLTAGE STABILIZERS

Even if with the experiments previously described it has been demonstrated that the semiconductor diode  is behaved from stabilizing element of voltage, in practical, in order to carry out this important function, reruns to one special diode , purposely conceived, called diode  zener. Which it comes constructed with an intrinsic voltage of job, that it is that typical one of stabilization.
As an example: 2,7 V - 3,3 V - 4,7 V, 6v-6,1v-7,2v-9,1v-10v and therefore via in a range of values that extends from 0,78 V to 20V approximately.

Fig. 4 - On the left the real configuration of a diode  is brought back zener in which, in proximity of the cathode electrode, the ring is present pointer. On the right electrical worker of the zener is designed to the symbol normally adopted in the composition of the electronics project.

As it can be observed, the cathode is easy individualistic through the ring-guide received in proximity of the electrode homonym. We resume hour the concept, as soon as formulated to the beginning, of the demanded inverse voltage from the operation of the diode  zener. It is  to remember that one of the characteristic parameters of the semiconductor diode  is the voltage inverse principle that is in a position to support. The diode , when polarized in inverse sense, increases to the barrier voltage hindering the current flow . But it is pure true that this concept is valid until to precise values of polarization voltage, since, from a sure point in then manifest the destruction total of the component . It is used also to say that, once old the maximum inverse voltage, meets a zone strongly conduction that, generating a chain reaction, quickly leads the diode  to its destruction. However, drugging physically the silicon crystal, that is adding to it some impurity, it is possible to control the chain reaction so as to to avoid the breach of the diode ; but it is obvious that the doping of the silicon not enough, because it is necessary to also supply to a limitation of the current that slides through the component through opportune resistances. Therefore, the conceived component therefore takes the diode  name zener and the maximum inverse voltage is called voltage of zener . The zone, instead, in which the diode  it can calmly work, without auto ­ destroying, assumes the name of zone of breakdown . We conclude asserting, once again, that the diode  zener must inversely be polarized and that it does not lead current until the voltage applied to its electrodes is inferior to that one of job.

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