Example 7-3: The reverse current in a certain 12 V, 2.4 W zener diode must be at least 5 mA to ensure that the diode remains in breakdown. The diode is to be used in the regulator circuit shown in...

Extracted text: Example 7-3: The reverse current in a certain 12 V, 2.4 W zener diode must be at least 5 mA to ensure that the diode remains in breakdown. The diode is to be used in the regulator circuit shown in Fig. 7-9, where Vi can vary from 18 V to 24 V. Find a suitable value for RS and the minimum rated power dissipation that RS should have. Rs Solution: IZK = 5 mA & IZM= Pz/Vz=2.4/12 = 200 mA V- Vz R26002 (when the switch S is open) = 00