| 摘要 |
A DC-DC converter circuit for performing DC-DC conversion by switching an input voltage on and off achieves high conversion efficiency while, at the same time, making it possible to supply low voltages. The DC-DC converter circuit includes: a level shift circuit which generates a voltage that is lower than the input voltage by a predetermined voltage; a power supply generating circuit which generates a floating power supply having a magnitude equal to the difference between the input voltage and the output voltage of the level shift circuit; a capacitor which is charged up by the floating power supply generated by the power supply generating circuit; and a driver circuit which supplies the charged voltage of the capacitor as a driving voltage to the main switching device in accordance with the operation control signal. In an alternative configuration, the capacitor is omitted, and the driver circuit is configured to supply the voltage of the floating power supply generated by the power supply generating circuit as the driving voltage to the main switching device.
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