# Encyclopedia Magnetica

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calculator:thermal_resistance_of_ferrite_cores

## Calculator of thermal resistance of ferrite cores

Some authors suggest that an empirical equation can be used as a first approximation of the thermal resistance of ferrite cores.

If the value of the core volume is used in cm3 then the thermal resistance can be calculated in (K/W):

 $$R_{th} = 53 · (V_{core})^{-0.54}$$ (K/W) after Sanjaya Maniktala, Switching power supplies A-Z, 2nd edition, Newnes, 2012, ISBN 978-0-12-386533-5, p. 155

Vcore =

Estimated Rth (K/W) =

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