What is the difference between a coupled inductor and an actual transformer? The LT3757 datasheet mentions that I need a coupled inductor for the SEPIC to work
Answer
You don't have to use coupled inductors in a SEPIC configuration. The main advantage is that you can get by with lower inductance windings. If the two inductors are closely coupled, the ripple current is divided between them and the required inductance is halved. So if you want to replace a coupled inductor which has two 3.3 uH windings, you would need two individual inductors of 6.6 uH each at the same current rating.
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