In the design of ferrite core
transformers for use in
switchmode power supplies, one
must take into consideration
switching frequency, operating
flux density, the resulting core
loss, and temperature of opera-
tion. Temperature rise above
ambient is a direct result of core
losses in the ferrite material and
of copper losses in the windings.
To limit the temperature rise due
to core losses, the designer must
limit the operating flux density for
the specified switching frequency
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