Question
Download Solution PDFWhen the junction temperature of a transistor increases, its ______ increases.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFWhen the junction temperature of a transistor increases, it increases the collector current causing a further increase in temperature and this process is called Thermal runway.
So, option (2) is correct.
Notes:
Thermal resistance between collector-base junction develops due to thermal run-way.
\(\theta = \frac{{{T_j} - {T_A}}}{{{P_D}}}\left( {K/watt} \right)\)
Where,
θ = Thermal resistance
Tj = collector Junction Temperature
TA = Ambient temperature
PD = Power dissipation along collector junction.
Thermal resistance increases due to increase in Junction temperature.
Thermal run-away can be avoided if:
\(\frac{{\partial {P_c}}}{{\partial {T_j}}} \le \frac{{\partial {P_D}}}{{\partial {T_j}}} = \frac{1}{\theta }\)
Where,
\(\frac{{\partial {P_c}}}{{\partial {T_j}}}\) is rate at which heat is released.
\(\frac{{\partial {P_D}}}{{\partial {T_j}}}\) is rate at which heat is dissipated.
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