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发表于 2014-7-28 15:23:12
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A synchronous rectifier is an electronic switching circuit that improves power-
conversion efficiency by placing a low-resistance conduction path across the
diode rectifier in a switch-mode regulator. For a 3.3 V power supply, the
traditional diode-rectifier loss is significant with very low efficiency (say less
than 70%). For step-down regulators with a 3.3 V output and 12 V battery
input voltage, a 0.4 V forward voltage of a Schottky diode represents a typical
efficiency penalty of about 12%, aside from other loss mechanisms. The losses |
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