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The condition to be satisfied to prevent thermal runaway?

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The condition to be satisfied to prevent thermal runaway?

(a) ∂PC/∂TJ > 1/Q

(b) ∂PC/∂TJ < 1/Q

(c) ∂PC/∂TJ > 1/Q

(d) ∂PC/∂TJ < 1/Q

The question was posed to me in unit test.

My question is taken from Thermal Stability topic in portion Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

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Right answer is (b) ∂PC/∂TJ < 1/Q

Easy explanation: PC is the power dissipated at the collector junction. TJ is junction temperature which varies. The difference between these temperatures is directly proportional to the power dissipation. Here, Q is called as thermal resistance which is proportionality constant.

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