Discussion
Which topology would you choose for a low-voltage, high-current supply?
Answer: D
At low voltage the forward drops matter proportionally more, so a bridge using Schottky diodes minimises the loss while keeping the voltage rating modest. A half-wave circuit wastes half the cycle and magnetises the core. Silicon diodes cost twice the drop of Schottkies. And a doubler is for the opposite case, high voltage at low current. Which imperfection dominates depends on the operating point, and at five volts a 0.4 V saving per diode is worth having. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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