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 Ω c

Question

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 Ω connected in series with zener diode will be

TestHub · Accepted Answer

Using the series resistance formula for a zener diode R S ​ I Z m a x ​ ∴ R S ​ ​ = I Z m a x ​ ​ ( V S ​ − V Z ​ ) ​ = V Z ​ P Z ​ ​ = 5 2 ​ = 400 mA = 400 × 1 0 − 3 ( 12 − 5 ) ​ = 400 7 ​ × 1 0 3 = 17.5Ω ​

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