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A DC-DC converter is a device that serves to obtain dc voltage, normally stabilized, from a DC power supply, normally non-stabilized. This input DC power is usually delivered by batteries or any power supply. The converter output voltage can be lower, higher or even equal to the input voltage. There are also converters with several outputs . The output can share some terminals with the input or be completely isolated from the input.
Some typical uses of converters are:
• To convert high DC voltages in other voltages that can be used to feed electronic equipment.
• To provide a galvanic isolation for several pieces of equipment fed from the same power supply among them and with regard to this one.
• To supply multiple power voltages from a single power line to pieces of equipment with different requirements.
• To stabilize a voltage supplied from a battery which is subject to variations depending on the battery charge condition or to any other noisy or unstable DC current power line.
There is a large number of DC/DC converter topologies, each one with a series of particularities which make it more or less appropriate for a given application.