Abstract: A light-emitting element drive device includes, for example, a current sense amplifier configured to generate a current detection signal corresponding to a difference between a sense voltage corresponding to an inductor current (and thus an output current) supplied to a light-emitting element and a predetermined current setting signal (e.g., an offset voltage corresponding to a set current), an error amplifier configured to generate an error signal such that a direct-current component of the current detection signal has a zero value, a comparator configured to generate a set signal by comparing the current detection signal with the error signal, and a driver configured to perform feedback control of the output current in accordance with the set signal.

Abstract: A semiconductor device includes: a current sense circuit that generates a current sense signal corresponding to a monitoring target current; an error amplifier; a comparator; and a controller. The current sense circuit includes: a differential amplifier of a current output type; a first input resistor connected between a first input terminal of the differential amplifier and a first current sense terminal; a second input resistor connected between a second input terminal of the differential amplifier and a second current sense terminal; an output resistor configured to be connected to the output terminal of the differential amplifier; a first feedback current path across which a first feedback current is passed between the first input terminal and the output terminal of the differential amplifier; and a second feedback current path across which a second feedback current is passed between the second input terminal of the differential amplifier and the output terminal.

Abstract: A semiconductor device includes: a control terminal configured to receive an electrical input; multiple LED current detection terminals; a current detection signal generator configured to generate a current detection signal from current information obtained via the multiple LED current detection terminals; a voltage detection signal generator configured to generate a voltage detection signal according to an LED driving voltage; a switching element; a driver configured to drive the switching element; and a controller configured to control the driver, in which the controller is configured to control the driver by switching between a constant current operation and a constant voltage operation based on a comparison result between the voltage level of the control terminal and a predetermined threshold level.

Abstract: For example, a semiconductor device disclosed in the present description is configured to function as a component of a switching power supply, and includes: a current sense signal generator configured to generate a current sense signal by amplifying a sense voltage corresponding to the output current of the switching power supply; a voltage sense signal generator configured to generate a voltage sense signal corresponding to the output voltage of the switching power supply; a selector configured to output as a selected sense signal one of the current sense signal and the voltage sense signal according to a mode switch signal; and an output feedback controller configured to control the driving of the switching power supply based on the selected sense signal.

Abstract: A level shifter includes a current output amplifier configured to output a first output current and a second output current through first and second output terminals thereof, respectively, a first resistor configured to be connected between each of an inverted input terminal and the first output terminal of the current output amplifier and an application terminal of a ground potential, and a second resistor configured to be connected between the second output terminal of the current output amplifier and an application terminal of a negative potential lower than the ground potential. A first analog signal referenced to the ground potential is accepted at a non-inverted input terminal of the current output amplifier, and a second analog signal referenced to the negative potential is outputted through one terminal of the second resistor.

Abstract: A semiconductor device comprises: a package including a first side, a second side parallel to the first side, a third side orthogonal to the first side and the second side, and a fourth side parallel to the third side and orthogonal to the first side and the second side; a first power supply terminal and a second power supply terminal either on the first or second side; a first power ground terminal and a second power ground terminal either on the first or the second side; a first switch output terminal and a second switch output terminal on the second side; a first upper switch between the first power supply terminal and the first switch output terminal; a first lower switch between the first switch output terminal and the first power ground terminal; a second lower switch between the second switch output terminal and the second power ground terminal.

Abstract: A light-emitting element driving circuit device in which the light-emitting element driving circuit device includes: a clock signal generator configured to generate a clock signal that drives high-side and low-side transistors of a switching output stage to turn them on and off complementarily; a first comparator configured to sense a voltage appearing across terminals of a current sense resistor; a light-emitting element current sense circuit configured to sense a light-emitting element current passing through the current sense resistor; and a duration determining circuit configured to measure a duration of a high level or a low level in the switching signal, in which the light-emitting element driving circuit device is configured to output a notification as to whether a connection status of a light-emitting element is good or bad based on a comparator output signal from the first comparator and an output from the duration determining circuit.

Abstract: A semiconductor device comprises: a package having a rectangular shape when viewed in plan and including a first side, a second side parallel to the first side, a third side orthogonal to the first side and the second side, and a fourth side parallel to the third side and orthogonal to the first side and the second side; a power supply terminal provided on the first side; a power ground terminal provided on the second side; a switch output terminal provided on the second side; an upper switch connected between the power supply terminal and the switch output terminal; and a lower switch 11L connected between the switch output terminal and the power ground terminal.

Abstract: A semiconductor integrated circuit for driving a light emitting element forms at least part of a light emitting element driving device configured to change the number of light emitting elements that are lit among a plurality of light emitting elements connected in series. The semiconductor integrated circuit includes a variable resistor controller configured to increase the resistance value of a variable resistor connected in series with the plurality of light emitting elements immediately before, or at the same time as, the time point at which the number of light emitting elements that are lit is reduced.

Abstract: A memory system includes a non-volatile memory and a controller that includes a first memory and is configured to write log data to the first memory, including a history of commands for controlling the memory system. An information processing system includes the memory system and an information processing device configured to store an expected value and to transmit a signal that instructs the memory system to stop when a value of the log data transmitted from the memory system does not match the expected value. The expected value and the transmitted value are determined based on the log data of the memory system.

Abstract: A memory system includes a non-volatile memory and a controller that includes a first memory and is configured to write log data to the first memory, including a history of commands for controlling the memory system. An information processing system includes the memory system and an information processing device configured to store an expected value and to transmit a signal that instructs the memory system to stop when a value of the log data transmitted from the memory system does not match the expected value. The expected value and the transmitted value are determined based on the log data of the memory system.

Abstract: A semiconductor device for controlling a driver circuit configured to drive an electronic device includes: a processing circuit configured to control the driver circuit according to a device address setting signal from outside and a control signal from outside; and an autonomous processing circuit provided independently of the processing circuit and configured to control the driver circuit under a preset condition, wherein when the device address setting signal falls within a predetermined condition, the processing circuit is enabled and the autonomous processing circuit is disabled, and when the device address setting signal deviates from the predetermined condition, the autonomous processing circuit is enabled and the processing circuit is disabled.

Abstract: A light emitting element driving device is configured to drive a light emitting element, the light emitting element driving device includes: a switch driving unit configured to drive a switch connectable to a negative end of the light emitting element the positive end of which is grounded; and an overcurrent detection unit configured to detect an overcurrent based on a voltage generated across both ends of a current detection resistor connected to a negative side of the switch and the switch driving unit is configured to switch the switch to an off-state when the overcurrent detection unit detects the overcurrent.

Abstract: A light-emitting element drive device includes, for example, a current sense amplifier configured to generate a current detection signal corresponding to a difference between a sense voltage corresponding to an inductor current (and thus an output current) supplied to a light-emitting element and a predetermined current setting signal (e.g., an offset voltage corresponding to a set current), an error amplifier configured to generate an error signal such that a direct-current component of the current detection signal has a zero value, a comparator configured to generate a set signal by comparing the current detection signal with the error signal, and a driver configured to perform feedback control of the output current in accordance with the set signal.

Abstract: A semiconductor device includes: a current sense circuit that generates a current sense signal corresponding to a monitoring target current; an error amplifier; a comparator; and a controller. The current sense circuit includes: a differential amplifier of a current output type; a first input resistor connected between a first input terminal of the differential amplifier and a first current sense terminal; a second input resistor connected between a second input terminal of the differential amplifier and a second current sense terminal; an output resistor configured to be connected to the output terminal of the differential amplifier; a first feedback current path across which a first feedback current is passed between the first input terminal and the output terminal of the differential amplifier; and a second feedback current path across which a second feedback current is passed between the second input terminal of the differential amplifier and the output terminal.

Abstract: A light-emitting element driving device includes an error amplifier configured to output a voltage corresponding to the difference between a voltage corresponding to the current flowing through a light-emitting element and a reference voltage, and to switch between an operating state and a non-operating state according to a control signal; a driver configured to drive, based on the output voltage of the error amplifier, a switching element in a voltage feeder configured to feed a voltage to the light-emitting element; and a suppressor configured, when the error amplifier switches from the non-operating state to the operating state, to suppress a rise in the output voltage of the error amplifier.

Abstract: This light-emitting element drive control device (100) comprises: a drive logic unit (113) which performs a drive control of a switch output stage (N1, D1, L1) for dropping an input voltage (VIN) to an output voltage (VOUT) and supplying a light-emitting element therewith; a charge-pump power supply unit (?) which generates a step-up voltage (CP) higher than the input voltage (VIN); and a current detecting comparator (114) which receives a supply of the step-up voltage (CP) and the output voltage (VOUT) as power supply voltages, and generates control signals (SET, RST) for the drive logic unit (113) by directly comparing a current detection signal (Vsns) corresponding to an inductor current (IL) of the switch output stage with a peak detection value (Vsns_pk) and a bottom detection value (Vsns_bt).

Abstract: A power control device is configured to control a power circuit that generates an output voltage based on an input supply voltage relative to a ground, and includes a first terminal fed with a common voltage, a second terminal connectable to an application terminal for the ground, a P-type substrate fed with the common voltage, a MOS transistor connected between the first and second terminals and configured with an N-channel MOSFET, and an internal reference voltage generating circuit configured to generate, based on the input supply voltage, an internal reference voltage relative to the common voltage. When the input supply voltage is turned on, the MOS transistor is turned on and thereby the first and second terminals are short-circuited together.

Abstract: This light-emitting element drive control device (100) comprises: a drive logic unit (113) which performs a drive control of a switch output stage (N1, D1, L1) for dropping an input voltage (VIN) to an output voltage (VOUT) and supplying a light-emitting element therewith; a charge-pump power supply unit (?) which generates a step-up voltage (CP) higher than the input voltage (VIN); and a current detecting comparator (114) which receives a supply of the step-up voltage (CP) and the output voltage (VOUT) as power supply voltages, and generates control signals (SET, RST) for the drive logic unit (113) by directly comparing a current detection signal (Vsns) corresponding to an inductor current (IL) of the switch output stage with a peak detection value (Vsns_pk) and a bottom detection value (Vsns_bt).

Abstract: A level shifter includes a current output amplifier configured to output a first output current and a second output current through first and second output terminals thereof, respectively, a first resistor configured to be connected between each of an inverted input terminal and the first output terminal of the current output amplifier and an application terminal of a ground potential, and a second resistor configured to be connected between the second output terminal of the current output amplifier and an application terminal of a negative potential lower than the ground potential. A first analog signal referenced to the ground potential is accepted at a non-inverted input terminal of the current output amplifier, and a second analog signal referenced to the negative potential is outputted through one terminal of the second resistor.