Abstract: A switch driving device 10 comprises: multichannel switch elements SW1 to SW8 which are connected in parallel to a plurality of light-emitting elements included in a vehicle-mounted light-emitting device; and a logic portion 120 which automatically starts a series of switch driving sequence so that the on-off states of the switch elements SW1 to SW8 are sequentially switched in a predetermined pattern in response to the power-on of the device.

Abstract: A light-emitting element driving semiconductor integrated circuit constitutes at least part of a light-emitting element driving device that is configured to drive a first and a second light source when the first light source is not short-circuited and drive the second light source when the first light source is short-circuited and that includes an output capacitor. The light-emitting element driving semiconductor integrated circuit has a controller configured to control the resistance value of a variable resistor connected in series with the first and second light sources according to the voltage across a resistor connected in series with the first and second light sources.

Abstract: Provided is a charge pump including a flying capacitor, an output capacitor, a switch group arranged to switch connection states of the capacitors so as to generate an output voltage from an input voltage, and a feedback control unit arranged to adjust an interterminal voltage of the flying capacitor to a predetermined target value when charging the same. On the basis of a first node voltage applied to a first terminal of the flying capacitor, the feedback control unit adjusts a second node voltage at a second terminal of the flying capacitor. The feedback control unit includes a voltage detection unit arranged to detect the interterminal voltage of the flying capacitor, and a voltage adjustment unit arranged to adjust the second node voltage according to a result of detection by the voltage detection unit.

Abstract: An LED driver includes a constant current circuit for supplying a constant current to a light-emitting portion composed of LEDs, a main transistor inserted serially between the light-emitting portion and the constant current circuit, a sub transistor connected to the node between the constant current circuit and the main transistor, and a control circuit. The LED driver drives the main transistor with pulses to make the light-emitting portion emit light in pulses. The control circuit, before turning on the main transistor, turns on the sub transistor to pass the constant current in the constant current circuit via the sub transistor, and, when turning on the main transistor, turns off the sub transistor.

Abstract: An LED driver includes a constant current circuit for supplying a constant current to a light-emitting portion composed of LEDs, a main transistor inserted serially between the light-emitting portion and the constant current circuit, a sub transistor connected to the node between the constant current circuit and the main transistor, and a control circuit. The LED driver drives the main transistor with pulses to make the light-emitting portion emit light in pulses. The control circuit, before turning on the main transistor, turns on the sub transistor to pass the constant current in the constant current circuit via the sub transistor, and, when turning on the main transistor, turns off the sub transistor.

Abstract: Provided is a charge pump including a flying capacitor, an output capacitor, a switch group arranged to switch connection states of the capacitors so as to generate an output voltage from an input voltage, and a feedback control unit arranged to adjust an interterminal voltage of the flying capacitor to a predetermined target value when charging the same. On the basis of a first node voltage applied to a first terminal of the flying capacitor, the feedback control unit adjusts a second node voltage at a second terminal of the flying capacitor. The feedback control unit includes a voltage detection unit arranged to detect the interterminal voltage of the flying capacitor, and a voltage adjustment unit arranged to adjust the second node voltage according to a result of detection by the voltage detection unit.

Abstract: An oscillation circuit for generating a clock signal of a switching power supply circuit is provided. The oscillation circuit includes a circuit configured to perform frequency spreading control of the clock signal in synchronization with an output operation control signal for periodically turning on/off an output operation of the switching power supply circuit.

Abstract: A switch driving device 10 comprises: multichannel switch elements SW1 to SW8 which are connected in parallel to a plurality of light-emitting elements included in a vehicle-mounted light-emitting device; and a logic portion 120 which automatically starts a series of switch driving sequence so that the on-off states of the switch elements SW1 to SW8 are sequentially switched in a predetermined pattern in response to the power-on of the device.

Abstract: A light-emitting element driving semiconductor integrated circuit constitutes at least part of a light-emitting element driving device that is configured to drive a first and a second light source when the first light source is not short-circuited and drive the second light source when the first light source is short-circuited and that includes an output capacitor. The light-emitting element driving semiconductor integrated circuit has a controller configured to control the resistance value of a variable resistor connected in series with the first and second light sources according to the voltage across a resistor connected in series with the first and second light sources.

Abstract: An oscillation circuit for generating a clock signal of a switching power supply circuit is provided. The oscillation circuit includes a circuit configured to perform frequency spreading control of the clock signal in synchronization with an output operation control signal for periodically turning on/off an output operation of the switching power supply circuit.

Abstract: A system includes an output driver circuit configured to operate a light emitting diode (LED) display having a plurality of columns of LED devices. The output driver circuit is configured to drive a given column output for the plurality of columns of LED devices in response to being activated based on data and an driver on signal supplied to the output driver circuit. A pre-discharge circuit includes a separate discharge circuit connected to each of the column outputs. The pre-discharge circuit is configured to discharge the given column output for a predetermined period of time before the output driver circuit is activated.

Abstract: A system includes an output driver circuit configured to operate a light emitting diode (LED) display having a plurality of columns of LED devices. The output driver circuit is configured to drive a given column output for the plurality of columns of LED devices in response to being activated based on data and an driver on signal supplied to the output driver circuit. A pre-discharge circuit includes a separate discharge circuit connected to each of the column outputs. The pre-discharge circuit is configured to discharge the given column output for a predetermined period of time before the output driver circuit is activated.

Abstract: A LED drive circuit equipped with oscillator 18, up/down counter 20, and DAC 22 in order to drive multiple LEDs 10(1)-10(m) in a block. Up/down counter 20 carries out count-up/down operations in sync with clock CLK sent from oscillator 18 during the ramping up/down of pulse-lighting of the LEDs. DAC 22 converts counter count value DN into analog voltage signal VDAC and supplies it to the gate terminal of NMOS transistor 14 via low-pass filter 28 and buffer amplifier 24.

Abstract: A LED drive circuit equipped with oscillator 18, up/down counter 20, and DAC 22 in order to drive multiple LEDs 10(1)-10(m) in a block. Up/down counter 20 carries out count-up/down operations in sync with clock CLK sent from oscillator 18 during the ramping up/down of pulse-lighting of the LEDs. DAC 22 converts counter count value DN into analog voltage signal VDAC and supplies it to the gate terminal of NMOS transistor 14 via low-pass filter 28 and buffer amplifier 24.

Abstract: The present invention relates to a compound of formula (I) (wherein R1 and R2 represent an aryl group, a heterocyclic group, an alkyl group, an alkenyl group and the like which are optionally substituted, R3 represents a hydrogen atom or a hydroxyl group, and X1 and X2 represent an oxygen atom or a sulfur atom, or a nitrogen atom which may be substituted), a pharmaceutically acceptable derivative thereof or a salt thereof. The present invention also relates to a pharmaceutical composition comprising a compound described above as an active ingredient for the prevention or treatment of bacterial infections. The present invention includes the use of a compound described above in order to prepare a medicament effective in the prevention or treatment of bacterial infections.

Abstract: A charge pump DC/DC converter having an improved the ripple characteristic in its output voltage and make it possible to adjust the boosting rate in a stepwise manner. In phase I, two flying capacitors Ca, Cb are connected in series between voltage input terminal 12 and voltage output terminal 14. In this connection state, flying capacitor Ca is charged by the current supplied from DC power supply 10, while flying capacitor Cb discharges to the load side. In phase II, flying capacitor Ca is connected between voltage input terminal 12 and voltage output terminal 14, while flying capacitor Cb is connected between voltage input terminal 12 and the ground potential. In this connection state, flying capacitor Ca discharges to the load side, while flying capacitor Cb is charged by the current supplied from DC power supply 10.

Abstract: A charge pump DC/DC converter having an improved the ripple characteristic in its output voltage and make it possible to adjust the boosting rate in a stepwise manner. In phase I, two flying capacitors Ca, Cb are connected in series between voltage input terminal 12 and voltage output terminal 14. In this connection state, flying capacitor Ca is charged by the current supplied from DC power supply 10, while flying capacitor Cb discharges to the load side. In phase II, flying capacitor Ca is connected between voltage input terminal 12 and voltage output terminal 14, while flying capacitor Cb is connected between voltage input terminal 12 and the ground potential. In this connection state, flying capacitor Ca discharges to the load side, while flying capacitor Cb is charged by the current supplied from DC power supply 10.

Abstract: A compound of formula (I) 1