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A silicon diode is operating at 25°C with a forward bias of 0.6 V and a current of 0.5 A. If the current is held constant at 0.5 A and the temperature of the device is raised to 75° C, the voltage across the diode is likely to be
1. 0.47 V
2. 0.60 V
3. 0.66 V
4. 0.75 V

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Correct Answer - Option 1 : 0.47 V

Concept:

For the forward-biased P – N junction, as the temperature increases the forward voltage decreases by 2.5 mV/°C which can be written as

\(\frac{{dv}}{{dt}} = - 2.5\;mV/^\circ C\)

Calculation:

Given, T1 = 25°C and T2 = 75°C

For (75 - 25)°C increase in temperature,

The voltage will decrease by  2.5 × 50 = 125 mV 

The voltage across the diode is 600 mV - 125 mV = 475 mV

= 0.475 V

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