How to determine the actual working power of a transistor?

wcqs01

How to determine the actual working power of a transistor? [Copy link]

Generally, the product manual of transistor manufacturers will have the maximum power dissipation Pcm of the transistor. When the transistor is working in a specific circuit, how can I determine its actual power consumption? How can I ensure that the power of the selected transistor is sufficient? Is there a calculation formula? If there is no specific calculation formula, what parameters does the actual power consumption of the transistor have to do with? I have never understood this point. I hope you can give a detailed answer. Thank you.

仙猫

P≒Vce, the voltage across the collector and emitter of the transistor×collector current Ic

zhjzh72_2004

The product manual will have the maximum power dissipation Pcm of the transistor. The actual power consumed by the transistor working in the specific circuit can be calculated by referring to the equivalent DC power calculation formula for general circuits, as shown above. For high frequency and very high frequency, do we need to use extreme values?

wcqs01

Thank you for your answers, I don't understand the question above.

quanzx

PCM is only a parameter to ensure the power dissipation of the transistor. Generally, the intersection of the measured data on the left side of the curve can ensure that the power dissipation of the transistor is safe.