I am trying find the most effichient DC-DC solution for my charger, but I am
trying to avoid those costly DC-DC IC's as I don't think they are needed.  I
wanna boost voltage from 12v to 24v when charging up to 12 cells, but boost
it to maby 48v when charging more cells.  For 6 cells and under, I won't
need to boost at all.

After boosting I will be charging with PWM-regulated drop-down.
Alternatively a buck-boost solution could be used to do lower and higher
voltage than input for better effichiency.

Problem is how to do this at high enough current?  I would be satisfied with
maby 2-3 amps, but would love up to 5 amps....
The circuits I am fermiliar with works badly over 150mA-ish...

Any ideas ?  I weas hoping to avoid a transformer, but if needed I'll use
one.

Kyrre Aalerud

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