Gate driver for Class D audio amplifier with adaptive dV/dt control
AssigneeInternational Rectifier Corporation
InventorJun Honda
Life of this patent
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Abstract
Provided is a gate driver circuit for a Class D audio amplifier with adaptive dV/dt control. The circuit includes an output switching stage, a gate driver capable of driving the output switching stage with a variable dV/dt; and a mode control circuit for setting an operating mode of the gate driver, wherein, the operating mode is selected from a plurality of operating modes, changes the dV/dt of the gate driver, corresponds to a power output level, and provides a balance point between a generated Electromagnetic Interference (EMI) and an efficiency of the switching stage.
Claims11
A gate driver circuit for a Class D audio amplifier with adaptive dV/dt control, the circuit comprising:
- an output switching stage;
- a gate driver capable of driving the output switching stage with a variable dV/dt;
- and
- a mode control circuit for setting an operating mode of the gate driver, wherein, the operating mode is selected from a plurality of operating modes, changes the dV/dt of the gate driver, corresponds to a power output level, and provides a balance point between a generated Electromagnetic Interference (EMI) and an efficiency of the switching stage.
A method of operating a gate driver circuit for a Class D audio amplifier using adaptive dV/dt control, the method comprising the step of:
- determining a power output level of a gate driver capable of driving an output switching stage with a variable dV/dt;
- selecting an operating mode corresponding to the power output level for providing a balance point between a generated Electromagnetic Interference (EMI) and an efficiency of the switching stage;
- setting the operating mode and therefore the dV/dt of the gate driver.
Dependencies are inferred from the claim text.