用途：用于线性调整器，可调节电源和开关电源。
Purpose: Linear regulators, adjustable power supply, switching power supply.
目前，开关电源的用处较之线性电源越来越普遍，这主要是由于体积和效率在电源设计的重要性日益进步。
Currently, the use of switching power supply than the linear power more widely, mainly because of the volume and efficiency in the growing importance of power supply design.
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