Zener diode static and dynamic parameters

Uz– Stable Voltage
It describes the stable voltage value created by the two ends of the zener diode when the rated existing go through it. This worth differs slightly with the operating current and also temperature. And also as a result of the distinction in manufacturing process, the voltage law values of the exact same sort of zener are not precisely the exact same. For instance, the 2CW51 regulator has a Vzmin of 3.0 V and a Vzmax of 3.6 V.
Iz– Rated Current
It shows the current value travelling through the tube when the voltage regulator generates a stable voltage. If the current is listed below this value, the voltage regulation result will be worse, and also it is permitted to be above this value as long as the rated power loss is not gone beyond, as well as the voltage regulation performance will be better, but at the same time, even more power is consumed.
Rz– Dynamic Resistance
It’s the ratio of the voltage modification to the current adjustment across the zener diode, which differs with the operating current. Generally, the larger the operating current is, the smaller sized the dynamic resistance will be. For instance, the operating current of the 2CW7C zener diode is 5mA, as well as its Rz is 18Ω. When the operating current is 1OmA, Rz is 8Ω. As well as when it is 20mA, Rz is 2Ω. And also if it exceeds 20mA, the worth will certainly be generally continuous.
Pz– Rated Power Consumption
It is figured out by the permitted temperature surge of the chip, and also its worth is the product of the stable voltage Vz and the optimum allowable current Izm. For example, if the Vz of the 2CW51 zener diode is 3V and also its Izm is 20mA, the Pz of the diode is 60mWo.
α– Temperature Coefficient
If the temperature level of the Zener diode modifications, its stable voltage will also alter somewhat. The relative changing worth of the voltage across the tube caused by the temperature level modification of 1 ° C is the temperature coefficient (device: %/ ° C).
Typically speaking, we call the voltage regulation worth listed below 6V zener breakdown, and under the conditions, the temperature coefficient of the diode is adverse. Avalanche break down happens when the voltage regulation value is greater than 6V, as well as the temperature coefficient is positive.
When the temperature increases, the deficiency layer lowers. In the depletion layer, the energy of the valence electrons of the atom increases, and also electrical field with smaller intensity can thrill the valence electrons from the atoms to generate zener break down, so the temperature level coefficient is unfavorable. When the exhaustion layer is broad with an intensive electric field, the boosting temperature will certainly triggers the resonance amplitude of the lattice atoms to boost, which impedes the movement of providers, generating avalanche break down. In this case, avalanche break down can just happen when the reverse voltage is raised, so the temperature level coefficient of the avalanche break down is positive. This is why the voltage policy value of a zener diode paremeters with a voltage regulation value of 15V progressively enhances with temperature level, as well as the voltage policy worth of a zener diode with voltage law value of 5V slowly decreases with the temperature level. For instance, the temperature level coefficient of the 2CW58 zener diode is +0.07%/ ° C, that is, for every 1 ° C rise in temperature, the voltage guideline value will certainly enhance by 0.07%.
When there is a high needs for the power supply, two zener diodes with contrary temperature level coefficients can be attached in series as compensation. Due to common compensation, the temperature coefficient is considerably reduced to 0.0005%/ ° C.
IR– Reverse Leak Current
It describes the leak existing produced by the zener diode at the specified reverse voltage. As an example, when VR of 2CW58 zener diode is 1V, its IR is O. 1uA. And also when its VR is 6V, IR becomes 10uA.

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