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Two Load-Sharing, Redundant, 48V/10A Power Supplies Using an Ideal Diode

This circuit shows a 48V/10A ideal diode-OR application. An MBR10100 Schottky diode would dissipate 6W under these operating conditions. In contrast, the FDB3632 7.5mohm MOSFET dissipates only 0.75W. The reduced power loss increases efficiency and saves space required for heat sinking. If the power supply voltages are nearly equal, the load current is shared between the two supplies. Otherwise, the supply with the highest output voltage provides the load current.