DRIVE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a drive circuit wherein a power MOS transistor can be switched on / off at high speed among a plurality of different potential levels.

SOLUTION: The drive circuit is provided with: a constant voltage circuit 31 whose voltage depends on a voltage at a second power terminal VCC2; a Pch MOS transistor 7 whose gate is connected to the constant voltage circuit 31; and a buffer circuit 11 activated by a voltage between the source of the Pch MOS transistor 7 and the second power terminal VCC2 to drive the power MOS transistor 8, and quickly charges / discharges the parasitic capacitance of the power MOS transistor 8 to attain high-speed on / off-operations.

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