| 摘要 |
An FET 21 is connected in parallel to a series circuit of a switching device 13 and an inductor 12 between an input terminal 11a and an output terminal 11b, wherein an output voltage Vout is dropped only by an operation of the switching device 13; the FET 21 is turned on by a driving circuit 22 when the switching device 13 sustains an on duty factor of 100% so that a series resistance of the switching device 13 and the inductor 12 is connected in parallel to an on resistance of the FET 21, thereby increasing a supply current and extending a period during which an output voltage provided to the output terminal 11b is sustained at a predetermined level. Therefore, a power circuit capable of extending an operating time of a battery-operated power supply, a method for driving same, and further an electronic module implementing same can be obtained.
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