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