SWITCHING DEVICE DRIVING UNIT AND SEMICONDUCTOR APPARATUS
First Claim
1. A switching device driving unit, which is connected to a gate or a base of a switching device that requires a gate current or a base current so as to drive a load, and outputs a driving current for ON/OFF operating the switching device based on an inputted gate control signal to the gate or the base, the switching device driving unit comprising:
- a control current source circuit that is connected to a power supply side, and source-outputs a driving current to the gate or the base in response to an H level or an L level of the gate control signal;
a control current sink circuit that is connected to a ground side, and sink-outputs a driving current to the gate or the base in response to the L level or the H level of the gate control signal; and
an I/F circuit to which the gate control signal is inputted and which generates a first driving signal to be applied to the control current source circuit and a second driving signal to be applied to the control current sink circuit, whereinbased on the first driving signal, the control current source circuit sets the driving current to be source-outputted to the gate or the base of the switching device to different values in a stage of an initial ON operation of the switching operation in the switching device as well as in a stage after completion of the switching operation.
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Accused Products
Abstract
In order to provide a switching device driving unit that, even in a case where a threshold voltage of a switching device is varied, can suppress variations in switching speed, and prevent a power loss caused by an unnecessary gate current in a constant ON operation state of the switching device, so that a desired slew rate can be easily set, a control current source circuit sets to different values based on a first input driving signal, in a driving current to be source-outputted to a gate or a base of the switching device, a current in a stage of an initial ON operation of a switching operation of the switching device and a current in a stage after completion of the switching operation.
39 Citations
12 Claims
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1. A switching device driving unit, which is connected to a gate or a base of a switching device that requires a gate current or a base current so as to drive a load, and outputs a driving current for ON/OFF operating the switching device based on an inputted gate control signal to the gate or the base, the switching device driving unit comprising:
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a control current source circuit that is connected to a power supply side, and source-outputs a driving current to the gate or the base in response to an H level or an L level of the gate control signal; a control current sink circuit that is connected to a ground side, and sink-outputs a driving current to the gate or the base in response to the L level or the H level of the gate control signal; and an I/F circuit to which the gate control signal is inputted and which generates a first driving signal to be applied to the control current source circuit and a second driving signal to be applied to the control current sink circuit, wherein based on the first driving signal, the control current source circuit sets the driving current to be source-outputted to the gate or the base of the switching device to different values in a stage of an initial ON operation of the switching operation in the switching device as well as in a stage after completion of the switching operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification