Importance

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Abstract

A power source circuit includes a first power source terminal, and a second power source terminal, an output terminal, a first switching transistor that is connected between the first power source terminal and the output terminal, a comparator that compares a feedback voltage of the output voltage with a predetermined reference voltage, a pulse forming circuit that forms a pulse signal having a predetermined width in accordance with an output from the comparator, a timing adjustment circuit that outputs a control signal for the first switching transistor according to a pulse width of the pulse signal, and a frequency-locked loop (FLL) circuit, which controls the pulse width of the pulse signal of the pulse forming circuit in accordance with a frequency of the reference frequency signal and a frequency of the pulse signal.

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First Claim