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RE: TO-220 package wattage rating ?

Posted by Ugly (A) on April 25, 2016 at 20:09:58

In Reply to: TO-220 package wattage rating ? posted by Tweaker456 on April 24, 2016 at 22:52:37:

It's a little different than that.

The key parameter here is die temperature.

How effectively you cool the die dictates how much power you can put through a device and it's package.

In most applications it is the sum of switching and conduction losses that determines the total power being dissipated in the MOSFET.

The MOSFET manufacturer data sheet should contain the appropriate thermal impedance information for the packaging.

A good heat snk would come with thermal impedance data of its own.

Once you have an idea about power dissipated (in watts) and the thermal impedance (in degrees C/ watt) of the cooling solution just multiply them together to find Temperature rise above ambient of the die temperature in degrees C.

As long as you keep die temperature in specified range you are all good. If you take the die temperature above what it is rated by the manufacturer to withstand then there are no guarantees about it's reliability and it's probably going to fail.

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