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Not that much bigger. I was looking around for inductor design choices for SEPIC converters, and found that most inductors at around 250 kHZ require 2.4 amps max saturation current total. The one that is chosen for the boost converter can handle 3.4 amps without saturation. So, it can't be that much more expensive to get a dual winding inductor at 10 uH, that can handle that much saturation current.
So why don't you build a prototype SEPIC Driver and
report your findings back here...:beer:
Jerry
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