GATE DRIVER, MOTOR DRIVING DEVICE INCLUDING THE GATE DRIVER, AND APPARATUS EQUIPPED WITH THE MOTOR DRIVING DEVICE

摘要

Gate driver (3) for forcing power transistor (2) including a gate electrode insulated with oxide film into conduction or shut-off, gate driver (3) includes first current source (31) for outputting a first current-value to raise an electric potential of the gate electrode for changing the shut-off state of power transistor (2) to the conductive state; and second current source (32) for outputting a second current-value to lower the electric potential of the gate electrode for changing the conductive state of power transistor (2) to the shut-off state. The first current-value and the second current-value are assigned based on at least one kind of current-source control information. This structure allows preparing an appropriate speed of forcing power transistor (2) into conduction or shut-off with a small number of elements, and gate driver (3) can be used with ease for driving power transistors (2) having different output sizes.