Abstract: An IC chip has a series regulator built therein. A battery voltage is applied to an input pin. An output of a transistor constituting the series regulator occurs at an output pin via an output pad. A feedback signal derived from an output voltage occurs at an end of a voltage division resistor via a feedback pad. Diodes connect the output pad and the feedback pad.

Abstract: An electronic flash light is emitted from a camera by causing light-emitting diodes corresponding to red, green and blue simultaneously. Light emission of the light-emitting diodes corresponding to respective colors is controlled in accordance with the light-receiving characteristics of the light-receiving elements. For example, by adjusting the on and off duration ratio of switches in accordance with the light-receiving characteristics, the quantity of light emitted by the light-emitting diodes is adjusted.

Abstract: Light-emitting parts are attached to a light guide plate of a backlight unit so as to be illuminated by the backlight. A measuring unit formed by light-receiving parts is provided on the opposite side of the light guide plate. The measuring unit detects the luminance or color tone of light inside the light guide plate. A control unit subjects the luminance or color tone to feedback control in accordance with a result of measurement.

Abstract: A stabilized power supply unit having a current limiting function, comprising a detection transistor impressed with the same control voltage as the output transistor of the power supply unit, adapted to output a detection current which is exactly proportional to the output current, irrespective of the magnitude of the output current. The current detection transistor is controlled by the control voltage controlling the output transistor. A voltage correction unit is provided to control the voltage of the output end of the current detection transistor, equalizing the voltage with the output voltage. This arrangement provides a detection current exactly proportional to the output current.

Abstract: Using the leakage current of the base resistance of the bipolar transistor, semiconductor integrated circuit device which detects an overheat condition of the elements protected from overheat, is realized. The overheat detection circuit and the elements or the circuits which might be protected from overheat, are formed on the same substrate.

Abstract: When a double wire is used in a semiconductor device, it is difficult to detect the open failure of one of two wires. It is intended that this detection be carried out with a weak current and that the load regulation of the semiconductor device be improved. A series regulator is incorporated into an IC chip. A battery voltage is applied to an input pin. The output of a transistor that constitutes the regulator appears at an output pin via an output pad. A feedback signal of an output voltage appears at one end of a voltage-dividing resistor. The output pad is connected with a feedback pad via a protective resistor or diode.

Abstract: Using the leakage current of the base resistance of the bipolar transistor, semiconductor integrated circuit device which detects an overheat condition of the elements protected from overheat, is realized. The overheat detection circuit and the elements or the circuits which might be protected from overheat, are formed on the same substrate. The said overheat detection circuit is comprised of a bipolar transistor, its base resistance, and a constant-voltage source. The constant-voltage source provides a certain voltage to isolate the elements. The joint base resistance is located close to elements or circuits which might be protected from overheat and located far from the constant-voltage source.

Abstract: In a stabilized power supply unit having a current limiting function, the unit is designed to have a steep over-current dropping characteristic. This minimizes the over-current region, prevents oscillation during a startup, and limits inrush current during a start up within a predetermined range. The output voltage of the power supply unit provides a constant output voltage by controlling an output transistor by means of a differential amplifier amplifying the difference between a reference voltage and an output feedback voltage. The power supply unit has a first high-gain, slow-response type current limiting circuit that outputs a first current limiting signal when the output current of the power supply unit exceeds a predetermined level, and a second low-gain, quick-response type current limiting circuit that outputs a second current limiting signal when the outputs exceeds the predetermined level.

Abstract: A stabilized power supply unit having a current limiting function, comprising a detection transistor impressed with the same control voltage as the output transistor of the power supply unit, adapted to output a detection current which is exactly proportional to the output current, irrespective of the magnitude of the output current. The current detection transistor is controlled by the control voltage controlling the output transistor. A voltage correction unit is provided to control the voltage of the output end of the current detection transistor, equalizing the voltage with the output voltage. This arrangement provides a detection current exactly proportional to the output current.

Abstract: Using the leakage current of the base resistance of the bipolar transistor, semiconductor integrated circuit device which detects an overheat condition of the elements protected from overheat, is realized. The overheat detection circuit and the elements or the circuits which might be protected from overheat, are formed on the same substrate.