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The sinusoidal ac source in the figure has an rms value of 20 V . Considering all √2
possible values of RL, the minimum value of Rs in Ω to avoid burnout of the Zener diode is _______.
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- 99 to 201
- 100 to 101
- 199 to 201
- 299 to 301
Correct Option: D
To avoid burn-out IS ≥ IZ + IL
For RL = ∞ [considering all possible values]
IL = 0
| then , IS ≥ IZ > | ||
| RS |
| Since , 5.IS = | ||
| 4 |
| ⇒ IS = | A | |
| 20 |
| Then , | ≥ | |||
| 20 | RS |
⇒ RS ≥ 300 Ω
Minimum value of RS = 300 Ω
