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The total thermal resistance of a power transistor and heat sink is 20°C/W. The ambient temperature is 25°C and (TJ)MAX=200°C. If VCE=4V, find the maximum collector current that the transistor can carry without destruction. What will be the allowed value of collector current if ambient temperature rises to 75°C?
  • a)
    3.67A
  • b)
    7.56A
  • c)
    2.19A
  • d)
    1.56A
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The total thermal resistance of a power transistor and heat sink is 20...
PD =(TJ-TA)/ H
=200-75/20=6.25W.
Now, I= 6.25/4=1.56A.
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The total thermal resistance of a power transistor and heat sink is 20°C/W. The ambient temperature is 25°C and (TJ)MAX=200°C. If VCE=4V, find the maximum collector current that the transistor can carry without destruction. What will be the allowed value of collector current if ambient temperature rises to 75°C?a)3.67Ab)7.56Ac)2.19Ad)1.56ACorrect answer is option 'D'. Can you explain this answer?
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