| 摘要 |
A voltage supply circuit that switches and outputs multiple set voltages from an output terminal, has a boosting circuit that boosts a voltage supplied from a power supply and outputs the voltage to the output terminal; a voltage detecting circuit that outputs a first flag signal when detecting that the voltage outputted from the boosting circuit is not lower than the set voltage, outputs a second flag when detecting that the voltage outputted from the boosting circuit is not lower than a frequency adjusting voltage set lower than the set voltage; and a control circuit that controls an operation of the boosting circuit in response to the set voltage and the output signal of the voltage detecting circuit.
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