Driver circuit and method for reducing electromagnetic interference
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United States of America Patent
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May 3, 2011
Grant Date -
Jun 10, 2010
app pub date -
Dec 4, 2008
filing date -
Dec 4, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus and a method switch a load through a power transistor. The apparatus includes: a first current generator for generating a current to charge a capacitance of a control terminal of the power transistor during power on of the power transistor; a second current generator for generating a current to discharge the capacitance during power off of the power transistor. The apparatus is equipped with control circuitry having a storage element for storing a voltage value representative of the potential difference between the control terminal and a conduction terminal of the power transistor when the power transistor operates in the saturation region and a discharge circuit for generating an additional current to discharge the capacitance during the power-off process. The additional current is a function of the potential difference of the control terminal and the stored voltage value from the conduction terminal.
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