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301Off-line Converter Design and Magnetics

So, for example, to get the voltage at the drain of the MOSFET (swinging end of primary

winding), we need to add V

IN

(voltage at other end of winding), to the voltage waveform

that represents the voltage across the primary winding. That is how we got the voltage

waveforms shown in Figure 10.1 .

Coming to the question of how currents actually refl ect from one side of the transformer

to the other, it must be pointed out that even though the fi nal current scaling equations of

a fl yback transformer are exactly the same as in the case of an actual transformer, this is

not strictly ...