Gate Driver Circuit, Motor Driving Device Using the Same, and Electronic Apparatus

A gate driver circuit, driving a high-side transistor and a low-side transistor that constitute a switching circuit, comprising:

• a high-side driver driving the high-side transistor;
• a low-side driver driving the low-side transistor;
• a third output sensor asserting a third output detection signal when an output voltage of the switching circuit rises to a third threshold voltage;
• and
• a control circuit controlling the high-side driver and the low-side driver,
• wherein when the switching circuit is in a sink mode, the control circuit
• sets a low-side gate current that the low-side driver sinks from a gate of the low-side transistor to a fourth current amount in response to an instruction to turn off the low-side transistor, and
• sets the low-side gate current to a fifth current amount that is less than the fourth current amount in response to an assertion of the third output detection signal.

A gate driver circuit, driving a high-side transistor and a low-side transistor that constitute an output stage, comprising:

• a high-side driver driving the high-side transistor;
• a low-side driver driving the low-side transistor;
• a first output sensor asserting a first output detection signal when an output voltage of the output stage drops to a first threshold voltage;
• and
• a control circuit controlling the high-side driver and the low-side driver,
• wherein when the output stage is in a current source mode, the control circuit
• sets a high-side gate current that the high-side driver sinks from a gate of the high-side transistor to a first current amount in response to an instruction to turn off the high-side transistor, and
• sets the high-side gate current to a second current amount that is less than the first current amount in response to an assertion of the first output detection signal.

A gate driver circuit, driving a high-side transistor and a low-side transistor that constitute an output stage, comprising:

• a high-side driver driving the high-side transistor;
• a low-side driver driving the low-side transistor;
• a third output sensor asserting a third output detection signal when an output voltage of the output stage rises to a third threshold voltage;
• and
• a control circuit controlling the high-side driver and the low-side driver,
• wherein when the output stage is in a current sink mode, the control circuit
• sets a low-side gate current that the low-side driver sinks from a gate of the low-side transistor to a fourth current amount in response to an instruction to turn off the low-side transistor, and
• sets the low-side gate current to a fifth current amount that is less than the fourth current amount in response to an assertion of the third output detection signal.