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I am very confused on this one, Help would be greatlyappreciated. Defaults:Ambie

ID: 1830279 • Letter: I

Question

I am very confused on this one, Help would be greatlyappreciated.

Defaults:Ambient temperature TA = 25oC. 40W
power transistor with TJMAX = 225oC, cooled by‘top
hat’ heat sink with CA = 5oC/W.

An ideal class-B amplifier is required for a
RL = 5 load.

(a) Using the default power transistors,
determine the minimum supply rail voltage
required if TJ < 105oC is required.

(b) If the supply rail voltage VS = (+-) 12V
what is the minimum allowed load resistance RL
and maximum power that these transistors (as
constrained) can deliver to the load?

Explanation / Answer

There should be a working equation that described thethermal effect... given in your book what is it ?

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I am very confused on this topic and would greatly appreciate a little feedback.

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