Zener Voltage Regulator:
The regulated power supply can use zener diode as the voltage controlling device as shown in the figure. The output voltage can be determined by the reverse breakdown voltage of zener diode. This is constant for a wide range of currents. The load voltage can be maintained constant by controlling current through the zener diode.
Fig.
The zener diode regulator has limits of range. The load current range for which the regulation is maintained, is the difference in between maximum allowable zener current and minimum current needed for the zener to operate in the breakdown region. For instance, if zener diode needs a minimum current of 10 mA and is limited to the maximum of 1A (to prevent the excessive dissipation), the range is nearly1 - 0.01 = 0.99A. If the load current variation exceeds 0.99A, regulation can be lost.
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