A Zener voltage regulator circuit is to maintain constant voltage at 60 V, over a current range frome 5 to 50 mA. The input supply voltage is 200 V. Determine the value of resistance R to be connected in the circuit, for voltage regulation from load current IL = 0 mA to IL max,

Question

A Zener voltage regulator circuit is to maintain constant voltage at 60 V, over a current range frome 5 to 50 mA. The input supply voltage is 200 V. Determine the value of resistance R to be connected in the circuit, for voltage regulation from load current [latex]I_{L}[/latex] = 0 mA to [latex]I_{L}[/latex] max, the maximum possible value of [latex]I_{L}[/latex]. What is the value of [latex]I_{L}[/latex] max?

Accepted Answer

Given [latex]V_{z} = V_{o}[/latex] = 60 V and [latex]V_{in}[/latex] = 200 V
(a) To find the value of resistance (R).

R = [latex]\frac{V_{in} – V_{o}}{I_{z(min)} + I_{L(max)}}[/latex]

= [latex]\frac{200 – 60}{50 × 10^{– 3}}=\frac{140}{50 × 10^{– 3}}[/latex]= 2.8 kΩ

(b) To find the value of [latex]I_{L(max)}[/latex].
If [latex]I_{z(max)}[/latex] = 50 mA, [latex]I_{L(min)}[/latex] = 0 mA
If [latex]I_{z(min)}[/latex] = 5 mA, [latex]I_{L(max)}[/latex] = 45 mA
Therefore, [latex]I_{L(max)}[/latex] = 45 mA

Question 18.36: A Zener voltage regulator circuit is to maintain constant vo...

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