| 摘要 |
There is provided an igniting semiconductor device such that it is possible to reliably prevent burning of an IGBT or ignition coil L, and erroneous ignition, even when reducing the size of a capacitor that generates a self-interrupting circuit time constant. A semiconductor device 5 of the invention is configured of an IGBT and a current control circuit 6. The current control circuit 6 is configured of a first series circuit wherein an IGBT and a sense resistor are connected in series, a drive signal control circuit 2, and a self-interrupting circuit 3. At a time of abnormal operation, the self-interrupting circuit 3 outputs a voltage whose amplitude temporally drops in stages toward 0V to the drive signal control circuit 2. The drive signal control circuit 2 controls the amplitude of a drive control signal so that the voltage across the sense resistor R1 is equivalent to the output voltage of the self-interrupting circuit 3. |
