Abstract: A light emitting load driving device includes a first constant current source structured to be serially connected to a first light emitting load group; a second constant current source structured to be serially connected to a second light emitting load group; a first load connection terminal structured to be connected to the first light emitting load group; a second load connection terminal structured to be connected to the second light emitting load group; and a control circuit structured to be supplied a first voltage applied to the first load connection terminal, a second voltage applied to the second load connection terminal, and a reference voltage applied to the control circuit, wherein the control circuit is structured to select a minimum voltage between the first voltage and the second voltage, and the control circuit is structured to equalize the minimum voltage and the reference voltage.

Abstract: A light emitting load driving device includes a first constant current source structured to be serially connected to a first light emitting load group; a second constant current source structured to be serially connected to a second light emitting load group; a first load connection terminal structured to be connected to the first light emitting load group; a second load connection terminal structured to be connected to the second light emitting load group; and a control circuit structured to be supplied a first voltage applied to the first load connection terminal, a second voltage applied to the second load connection terminal, and a reference voltage applied to the control circuit, wherein the control circuit is structured to select a minimum voltage between the first voltage and the second voltage, and the control circuit is structured to equalize the minimum voltage and the reference voltage.

Abstract: A light emitting load driving device includes a first constant current source structured to be serially connected to a first light emitting load group; a second constant current source structured to be serially connected to a second light emitting load group; a first load connection terminal structured to be connected to the first light emitting load group; a second load connection terminal structured to be connected to the second light emitting load group; and a control circuit structured to be supplied a first voltage applied to the first load connection terminal, a second voltage applied to the second load connection terminal, and a reference voltage applied to the control circuit, wherein the control circuit is structured to select a minimum voltage between the first voltage and the second voltage, and the control circuit is structured to equalize the minimum voltage and the reference voltage.

Abstract: A light emitting load driving device includes a plurality of constant current sources structured to be serially connected to a plurality of light emitting loads connected in parallel respectively, and structured to control a current flowing through the plurality of light emitting loads connected in parallel; a plurality of load connection terminals structured to be connected to the plurality of light emitting loads connected in parallel and the plurality of constant current sources respectively; a control circuit structured to be controlled based on a plurality of terminal voltage applied to the plurality of load connection terminals and a reference voltage, and structured to control a voltage output portion generating an output voltage provided to the plurality of light emitting loads connected in parallel so that both of a lowest terminal voltage applied to the plurality of load connection terminals and the reference voltage are equalized with respect to each other.

Abstract: A light emitting load driving device includes a plurality of constant current sources structured to be serially connected to a plurality of light emitting loads connected in parallel respectively, and structured to control a current flowing through the plurality of light emitting loads connected in parallel; a plurality of load connection terminals structured to be connected to the plurality of light emitting loads connected in parallel and the plurality of constant current sources respectively; a control circuit structured to be controlled based on a plurality of terminal voltage applied to the plurality of load connection terminals and a reference voltage, and structured to control a voltage output portion generating an output voltage provided to the plurality of light emitting loads connected in parallel so that both of a lowest terminal voltage applied to the plurality of load connection terminals and the reference voltage are equalized with respect to each other.

Abstract: A light emitting load driving device includes a plurality of constant current sources structured to be serially connected to a plurality of light emitting loads connected in parallel respectively, and structured to control a current flowing through the plurality of light emitting loads connected in parallel respective; a plurality of load connection terminals structured to connect the plurality of light emitting loads connected in parallel and the plurality of constant current sources respectively; a signal processing circuit structured to select and compare a lowest terminal voltage applied to the plurality of load connection terminals with a reference voltage, and output a comparison result; and a pulse width modulation control circuit structured to output a drive signal according to the comparison result, and structured to control a voltage output portion generating an output voltage provided to the plurality of light emitting loads connected in parallel respectively.

Abstract: A light emitting load driving device includes a plurality of constant current sources structured to be serially connected to a plurality of light emitting loads connected in parallel respectively, and structured to control a current flowing through the plurality of light emitting loads connected in parallel respective; a plurality of load connection terminals structured to connect the plurality of light emitting loads connected in parallel and the plurality of constant current sources respectively; a signal processing circuit structured to select and compare a lowest terminal voltage applied to the plurality of load connection terminals with a reference voltage, and output a comparison result; and a pulse width modulation control circuit structured to output a drive signal according to the comparison result, and structured to control a voltage output portion generating an output voltage provided to the plurality of light emitting loads connected in parallele respectively.

Abstract: A light emitting load driving device includes a plurality of constant current sources structured to be serially connected to a plurality of light emitting loads connected in parallel respectively, and structured to control a current flowing through the plurality of light emitting loads connected in parallel respective; a plurality of load connection terminals structured to connect the plurality of light emitting loads connected in parallel and the plurality of constant current sources respectively; a signal processing circuit structured to select and compare a lowest terminal voltage applied to the plurality of load connection terminals with a reference voltage, and output a comparison result; and a pulse width modulation control circuit structured to output a drive signal according to the comparison result, and structured to control a voltage output portion generating an output voltage provided to the plurality of light emitting loads connected in parallele respectively.

Abstract: A light emitting load driving device includes a plurality of constant current sources structured to be serially connected to a plurality of light emitting loads connected in parallel respectively, and structured to control a current flowing through the plurality of light emitting loads connected in parallel respective; a plurality of load connection terminals structured to connect the plurality of light emitting loads connected in parallel and the plurality of constant current sources respectively; a signal processing circuit structured to select and compare a lowest terminal voltage applied to the plurality of load connection terminals with a reference voltage, and output a comparison result; and a pulse width modulation control circuit structured to output a drive signal according to the comparison result, and structured to control a voltage output portion generating an output voltage provided to the plurality of light emitting loads connected in parallele respectively.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load driving device disclosed in the specification includes a power supply circuit for supplying to a load an output voltage converted from an input voltage, a detection voltage generation circuit for generating a detection voltage which varies depending on a magnitude of a voltage drop which across the load, and a control circuit for controlling the power supply circuit so that it performs output feedback control of the output voltage, on the basis of the detection voltage.

Abstract: A load such as an LED and a constant-current source are connected in series with each other between the node of a dc-dc conversion type power supply circuit providing an output voltage and the ground. The constant-current source provides a constant current Io, the magnitude of which can be adjusted. The power supply circuit controls the output voltage such that the voltage drop across the constant-current source serving as a detection voltage becomes equal to a reference voltage. Thus, the load current can be varied within a predetermined range while avoiding the power loss due to an increase in the load current, thereby always permitting efficient operation of the load.

Abstract: A load such as an LED and a constant-current source are connected in series with each other between the node of a dc-dc conversion type power supply circuit providing an output voltage and the ground. The constant-current source provides a constant current Io, the magnitude of which can be adjusted. The power, supply circuit controls the output voltage such that the voltage drop across the constant-current source serving as a detection voltage becomes equal to a reference voltage. Thus, the load current can be varied within a predetermined range while avoiding the power loss due to an increase in the load current, thereby always permitting efficient operation of the load.