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The SCR in the circuit shown has a latching current of 40 mA. A gate pulse of 50 s is applied to the SCR. The maximum value of R in Ω to ensure successful firing of the SCR is _____.
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- 7065
- 6045
- 6055 to 6065
- None of the above
Correct Option: C
From the given circuit,
Where IL is the latching current and tg is the gate pulse width
| ⇒ 40 × 10-3 = | + |  | 1 - e-{2.5 × 50 × 10-6} / 10-3} |  | |||
| R | 5 |
| ⇒ 40 × 10-3 = | + | | 1 - e-0.125 | | |||
| R | 5 |
| ⇒ | = 0.01649 | |
| R |
⇒ R = 6060 Ω.
