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DC-DC Converters. There are three kinds of switching mode DC-DC converters, buck, boost and buck-boost. The buck mode is used to reduce output voltage, whilst the boost mode can increase the output voltage. In the buck-boost mode, the output voltage can be maintained either higher or lower than the source but in the opposite polarity.. DC-DC Converters by Newmar Powering the Network: Rackmount, Bench Mount Mobile Mount, and Wall Mount. Voltage/Power Range: 12, 24, 48, 72, 110 VDC Input, 12 or 24 VDC Output, 3 – 50 Amps.