Rule of thumb for core loss

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kender

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Inductor and transformer design is an iterative process. One place to start the iteration is to make a guess based on core losses. On the web, I found 2 different rule of thumb values: 100 and 300 mW/cm3. Neither of the application notes said enough about temperature raise or air flow. Folks, what values are you typically using? Could you shed some intuition* onto this?

* I'm looking for shortcuts. I do have an idea about how to do this rigorously: calculate losses, apply thermal resistance, compare to max temperature raise.
 
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In a first order, manageable core losses are a function of core surface area rather than volume, because dissipated power is mainly transported by convection.
 

Hi kender
I suggest you to take a look into the Switchmode power supply cookbook written by Marty Brown ! he has some rules of thumbs which can be fine for you .
But one of the usual value for core loss is considering 5 or 10 percent of maximum power , for core loss ( this is a good design with selecting a good core )
Best Wishes + Merry christmas
Goldsmith
 

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