Drive circuit for semiconductor device
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United States of America Patent
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Sep 8, 2015
Grant Date -
Jan 29, 2015
app pub date -
Apr 3, 2014
filing date -
Jul 26, 2013
priority date (Note) -
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Abstract
A drive circuit is provided with an input terminal for receiving input signals, an output terminal that outputs drive signals generated from the input signals, a control power supply terminal that receives a control power supply voltage, an output terminal that outputs an output signal, and a reset terminal that receives a reset signal. The output signal is given to a gate of a MOSFET. A secondary side circuit and a MOSFET constitute a step-down chopper circuit, which steps down a voltage through duty ratio control of the gate drive signal and generates a control power supply voltage. Upon receipt of a reset signal, the drive circuit stops outputting the drive signal and changes the output signal so as to reduce the control power supply voltage VCC.
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