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MHT CET20239 May 2023Morning ShiftPhysicsSemiconductorsActual

A 5.0 ~V stabilized power supply is required to be designed using a 12 ~V DC power supply as input source. The maximum power rating of zener diode is 2.0 ~W . The minimum value of resistance R _ s in connected in series with zener diode will be

Options

  1. A16.5
  2. B17.5
  3. C18.5
  4. D15.5

Correct answer

B. 17.5

Step-by-step solution

Using the series resistance formula for a zener diode aligned R _ S & = ( V _ S - V _ Z ) I _ Z _ I _ Z & = P _ Z V _ Z = 2 5 =400 ~mA R _ S & = (12-5) 400 10⁻³ = 7 400 10^3 & =17.5 aligned

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