Abstract: Provided is an igniter capable of reducing occurrence of malfunction due to noise. An igniter (100) includes a switch element (111) having a first end, a temperature sensor (112) including at least one diode and having a cathode end (112B), a switch element control device (12) configured to control the switch element, and a switch element electrode (Pe) connected to the first end of the switch element and to the cathode end, and the switch element control device has a ground electrode (Pgnd) electrically isolated from the cathode end.

Abstract: An igniter that includes switch element and switch control device for controlling the switch element depending on ignition signal. The switch control device includes a determination stage that compares voltage associated with the ignition signal with a predetermined voltage to generate a determination signal, a driving stage that controls ON/OFF operations of the switch element depending on the determination signal, a timer circuit that asserts a conduction protection signal when state where the determination signal becomes an assert level corresponding to an ON operation of the switch element continues for predetermined time, a time-varying voltage generating circuit that generates time-varying voltage over time in response to the assertion of the conduction protection signal, and an amplifier that changes the voltage of a control terminal of the switch element such that detection voltage associated with coil current flowing in the switch element is close to the time-varying voltage.

Abstract: An igniter that includes switch element and switch control device for controlling the switch element depending on ignition signal. The switch control device includes a determination stage that compares voltage associated with the ignition signal with a predetermined voltage to generate a determination signal, a driving stage that controls ON/OFF operations of the switch element depending on the determination signal, a timer circuit that asserts a conduction protection signal when state where the determination signal becomes an assert level corresponding to an ON operation of the switch element continues for predetermined time, a time-varying voltage generating circuit that generates time-varying voltage over time in response to the assertion of the conduction protection signal, and an amplifier that changes the voltage of a control terminal of the switch element such that detection voltage associated with coil current flowing in the switch element is close to the time-varying voltage.

Abstract: A LED driving device 200 includes a LED driving IC 100, an inductor L1, a diode D1, a capacitor C1, and a backlight BL. The LED driving IC 100 includes an output control circuit 10 which generates a switching signal SD to convert an input voltage VIN to an output voltage VOUT supplied to a LED. The output control circuit 10 also generates a feedback voltage VR based on a terminal voltage inputted from the LED (i.e., a feedback input voltage). The LED driving IC 100 also includes a switching pulse adjustment circuit 30 to generate a third control signal SB and to provide the signal to the output control circuit 10. The third control signal SB is an adjusted signal of an ON time of the first control signal SA, based on the second control signal SC and the feedback voltage VR. The LED driving IC 100 also includes a signal judgment part 20 to generate a second control signal SC based on the first control signal SA.