Drive circuit and semiconductor apparatus
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United States of America Patent
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Jan 31, 2017
Grant Date -
Dec 10, 2015
app pub date -
Apr 13, 2015
filing date -
Jun 6, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A drive circuit includes a gate drive node, a power source node, and an output transistor connected between the gate drive node and the power source node that flows a current into the gate drive node. The drive circuit further includes an input transistor smaller than the output transistor that forms a current mirror with the output transistor. The drive circuit further includes an operational amplifier that outputs a control voltage depending on a potential difference between a voltage of the gate drive node and a constant voltage lower than a voltage of the power source node. The drive circuit further includes a control transistor including a control electrode receiving an output of the operational amplifier that is connected in series with the input transistor. The drive circuit further includes a constant current source connected in series with the control transistor.
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