Design Support

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Fault-tolerant power systems commonly achieve redundancy by diode OR-ing the outputs of several power supply modules. The OR-ing circuit is inefficient if the diode forward voltage drop represents a significant percentage of the load voltage. In low-voltage applications, a FET OR-ing circuit can be more efficient. This application note discusses the design and performance of a FET OR-ing circuit using Texas Instruments TPS2331 IC as a controller.