This is what I thought, but I went and did the calculations:MC34063 efficiency isn't mind-blowing. In combination with inductor value and switching frequency, the losses in your design are more or less normal operation, I fear. One point is the rather high saturation voltage of the darlington output stage, switching losses is another. I would suggest to use a recent buck switching regulator, with 12 V input, synchronous operation is still in reach, but good standard switcher like National LM2672 would be fine as well.
No, heat will be generated by current flow, In any configuration during switch off time open circuit voltage is allways eqal to supply voltage.
not if there is no local decoupling...
Hello Orsan Cart,if you don't have local decoupling - then the series inductance in the supply lines causes an overvoltage every time the switch turns off. Local decoupling absorbs this energy in the incoming lines. Regards Orson Cart.
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