The percent regulation of the Zener diode regulator shown in Figure 2.16 is 5 percent. The Zener voltage is \(V_{Z O}=6 \mathrm{~V}\) and the Zener resistance is \(r_{z}=3 \Omega\). Also, the load resistance varies between 500 and \(1000 \Omega\), the input resistance is \(R_{i}=280 \Omega\), and the minimum power supply voltage is \(V_{P S}(\min )=15 \mathrm{~V}\). Determine the maximum power supply voltage allowed.

Figure 2.16:-

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+ VPS R + IL ww RL VL Figure 2.16 A Zener diode voltage regulator circuit