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Zener diodes attempt to keep terminal voltage constant. If the load is fairly small, a single zener diode can be used for this purpose. If the load is large enough that the zener cannot hold the voltage within desired margins, I suggest using the zener to control the base of a power transistor; the emitter or collector (depending on transistor type) will be used as the output to the load.
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Line regulation and load regulation of zener diode?
Line regulation defines as the output voltage of the zener to remain constant under input line variation. Load regulations defined as the load increases or decreases the zener will control this variation by keeping the voltage constant.
Why the zener current taken five times the load current in zener diode as voltage regulator?
A: There is no X times current for a zener to regulate. The real limit is the zener power dissipation that determine the total current since the zener to regulate must carry its own breakdown current in addition to the load current when the load is absent . IF this is not taken in consideration the zener will surely burn out
Can a zener diode be used in place of ic 7805?
no, zener diode regulators can supply no more than a few tens of milliamperes to a load while maintaining stable regulation. a 7805 three terminal linear regulator IC is designed to provide up to 1 ampere to a load while maintaining stable regulation.Note: three terminal linear regulators like the 7805 already contain an internal zener diode acting as a voltage reference, but its internal load is only 1 or 2 milliamperes to keep it very stable.
What is Zener resistance of the Zener diode?
zener resistance of a zener diode is the resistance of the zener diode but which is the resistance of a diode
How can we find the zener impedance?
Zener impedance is calculated, like anything else, with Ohm's law. Take voltage and divide by current, and you get resistance (or impedance). The only thing special about a zener is that it is not linear, and you can not expect the impedance to remain the same if you change the voltage or current. In fact, the primary characteristic of a zener is that the voltage is relatively constant over the specified current range so, in effect, the zener is a dynamic resistor or, more correctly, a mostly-independent voltage load.
Line regulation and load regulation of zener diode?
Line regulation defines as the output voltage of the zener to remain constant under input line variation. Load regulations defined as the load increases or decreases the zener will control this variation by keeping the voltage constant.
How a zener diode is used in voltage regulator under both varying input and varying load condition?
In the varying input condition, the zener diode is used in such a that any variation in the input voltage,should not in any affect the load (that is the arrangement supplies just the voltage needed by the load no matter how high or low the supply voltage might go). In the varying load condition, the zener diode is connected in such a way that any change in the load voltage should not affect the input voltage.
What is the difference between regulated IC and the zener diode?
a zener regulator must sustain its own current to function plus the load currents IC regulator on the other hand will require very little current to sustain regulation plus there is a gain regulation that a zener do not have.
What are the features of Zener diode?
By varying doping levels ,it is possible to produce zener diodes with varying breakdown voltages.
Discussion of zener diode a voltage regulation?
A zener diode has a relatively flat voltage to current curve when reverse biased. Within limits, you can consider that the voltage across the zener diode is constant. You can use the zener as the primary regulator, so long as you consider the power requirements and dissipation of both the zener and the load, and you do not overload the zener. More often, the zener is used as a voltage reference in a larger power supply that uses other components, linear or switched, to supply the load.
What is the function of zener?
zener diode is a revers bias diode which used for voltage regulation.
What is application of zener diode?
A: It can have two function one is to provide a known voltage drop to a series circuit. The other is to provide voltage regulation across a load.
Why the zener current taken five times the load current in zener diode as voltage regulator?
A: There is no X times current for a zener to regulate. The real limit is the zener power dissipation that determine the total current since the zener to regulate must carry its own breakdown current in addition to the load current when the load is absent . IF this is not taken in consideration the zener will surely burn out
Why does the power factor of the load effects the V.R. of transformer?
With varying power factor the load current drawn changes, which in turn affects the voltage regulation
Disadvantage of zener voltage regulator?
It has poor regulation and wastes energy.
Can a zener diode be used in place of ic 7805?
no, zener diode regulators can supply no more than a few tens of milliamperes to a load while maintaining stable regulation. a 7805 three terminal linear regulator IC is designed to provide up to 1 ampere to a load while maintaining stable regulation.Note: three terminal linear regulators like the 7805 already contain an internal zener diode acting as a voltage reference, but its internal load is only 1 or 2 milliamperes to keep it very stable.
From theory you will remember that the zener diode is used in the?
Provided the zener has enough current through it it will control the voltage for a load.
