| 摘要 |
A power source device is provided including a boosting circuit for stepping-up an input voltage to a desired output voltage, a starter circuit for starting the boosting circuit in a starting period thereof, and a drive circuit for driving the boosting circuit as a substitute for the starter circuit after the output voltage of the boosting circuit becomes equal to or greater than a predetermined level. The starter circuit comprises a starter signal generation circuit for generating a starter signal which on/off controls a MOS transistor used for stepping-up in the boosting circuit, and a determining/controlling circuit which detects whether or not a monitor voltage in the boosting circuit is equal to or greater than a predetermined level while the MOS transistor is in the on-state, and inhibits outputting if the starter signal if the monitor voltage is equal to or greater than the predetermined level.
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