(3.8)
where f
op
is the frequency of operation of the converter.
The boost converter shown in Figure 3–3 can only be used as a step-up con-
verter. That is, the output voltage must be higher than the highest value of input
voltage input. If the inductor is replaced by a transformer, as seen in Figure
3–15, a topology called a flyback converter is made. The flyback voltage and
current, as seen by the power switch, are similar to those in the boost converter,
but are affected by the turns ratio of the transformer. The flyback voltage, which
is still V
out
+ V
diode
on the secondary, is scaled by the turns ratio of the trans-
former when viewed from the power switch. ...