Transcription of 'Magnetics Design 5 - Inductor and Flyback Transformer …
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'Magnetics Design 5 - Inductor and Flyback Transformer …
Section 5 Design limitations: The most important limitingfactors in Inductor Design are (a) temperature rise andefficiency considerations arising from core losses andac and dc winding losses, and (b) core filter inductors (buck-derived) --singleand multiple windings are seldom operated in thediscontinuous current mode because of the addedburden this places on the output filter capacitor, andbecause it results in poor cross-regulation in multipleoutput supplies. Typically operated in the continuousmode with peak-peak ripple current much smallerthan full load current , ac winding loss is usually notsignificant compared to dc inductors , boost inductors and flybacktransfonners are all members of the "power Inductor "family.
typical peak-peak triangular ripple current 20% of Idc, or 2A (worst at high Vin). In this example, the worst-case rms ripple current is 0.58A (triangular wave-form rms equals I pp / .Jj2 ), and rms ripple current squared is only .333, compared with the dc current squared of 100. Thus, for the ac f R loss to equal the
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