The drawing explains pretty much everything.
iPad RC Toy Tank
- November 20th, 2010
- Posted in 电子[Electronics]
- Tagged ipad, iPhone
- 1 Comment
Category: 电子[Electronics]
When design power electronics, to prevent devices from overheating and damage, heatsinks are commonly used. How to calculate heatsinks is thus an issue.
The basic theory is a thermal equivalent of Ohm’s Law. For a power transistor:
T(j-a) = Pd x Rth(j-a)
T(j-a) (in degrees Celsius) is the temperature rise of the transistor above ‘ambient ’ temperature.
Pd (in watts)is the power disspipated.
Rth(j-a) (in degress Celsius per watt)is the total thermal resistance between the junction and the ambient.
A design example:
