1.

In a zener regulatedpower supply a zenerdiode with Vz = 6 Visused for regulation.The load current is tobe 4 mA and theunregulated input is10 V. What should bethe value of seriesresistor Rs?

Answer»

The resistor value is 167 ohm.

Solution:

The load current when regulated perfectly must have value of series resistance as R in order that the Zener diode has larger current flow than load current.

The value of series resistance is calculated as follows,

Given: Zener Voltage, = 6 V

= 4 m A

Unregulated input = 10A

Now the total current is given by,

I = 20 + 4 = 24 m A

Voltage drop across the series resistance = Unregulated – Regulated

V = 10 – 6

V = 4 v

Therefore, series resistance R = 167 ohm.



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