A buck converter step-down converter is a DC-to-DC power converter which steps down voltage while stepping up current from its input supply to its output load. It is a class of switched-mode power supply SMPS typically containing at least two semiconductors a diode and a transistor , although modern buck converters frequently replace the diode with a second transistor used for synchronous rectification and at least one energy storage element, a capacitor , inductor , or the two in combination. To reduce voltage ripple, filters made of capacitors sometimes in combination with inductors are normally added to such a converter's output load-side filter and input supply-side filter. Switching converters such as buck converters provide much greater power efficiency as DC-to-DC converters than linear regulators , which are simpler circuits that lower voltages by dissipating power as heat, but do not step up output current.

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Buck converter



Msi 6389e Schematic


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