Question

A Zener diode voltage regulator is designed for 10v. If input voltage Is 24v. Find value of current limiting resistor ? (Pz= 500 mw)

Answer 1

V_Z = 10 V

V_in = 24 V

The rated maximum Zener current,

\(I_{Z} = \frac{P_{Z}}{V_Z}\)

\(= \frac{500 mW}{10 V}\)

\(= 50 \ mA\)

The minimum current limiting resistance,

\(R = \frac{V_{in} - V_Z}{I_{Z}}\)

\(= \frac {24 V- 10V}{0.05 A}\)

\(= \frac{14V}{0.05A}\)

\(= 280 \Omega\)