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This depends a lot on the boost ratio. High ratio simple
boost converters suffer a lot efficiency-wise when you
arelooking for high step-up; the flyback lets you take
voltage gain by turns ratio and relieves some of that.
But at the cost of complexity etc.
You originally asked about boost vs flyback. Now
what, bridge vs both?
I'd bet that somewhere somebody has compiled a
list of best-in-class efficiencies for every switcher
topology known.
But how useful that is, in affordable-components
reality, is a whole 'nother question.
I think given the simplicity of the question, finding
a proven design with an acceptable efficiency -
"which is best" being irrelevant if you can't handle
the development - is where you ought to spend
your inquiries.
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