°C/W/cm² wouldn't work for certain reasons. While a block may do good at a low area, it may fall behind with higher areas (a Cascade wouldn't do very well with a 50*50mm area, but a MCW6000 would remain very strong, for example) With °C/W and a defined size (yes, this does need to be added) the results will be constant. Increase the wattage by 1000 times and the value remains the same, but this won't happen with increase the surface area by 1000 times.
|