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A 6V zener diode along with a series res...

A `6V` zener diode along with a series resistance `R` is connected accrose a `12 V` supply. Calculate the minimum value of the resistance `R` required, if the maximum zener current is `30 mA`.

Text Solution

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The correct Answer is:
200
Refer to `V_i = 12V`
`I_1 = 30mA`

When zener current is maximum, then load current is minimum (i.e., `I_2 = 0` )
`:.` Maximum current, `I = I_1 + I_2 = 30+ 0`
` = 30 mA = 30xx10^(-3)A`
Voltage drop across zener diode = 6V
Since I is maximum, so minimum value of R is `R=(V_i-V_z)/I=(12-6)/(30xx10^(-3))=200Omega`
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