A semiconductor integrated circuit includes a constant-voltage circuit that outputs a constant voltage and a constant-current circuit. The constant-current circuit includes a first transistor. A voltage input as an input voltage to a first gate electrode of the first transistor is equal to the node voltage at an intermediate node in a connection path between the output of the constant-voltage circuit and an external resistor. A source region of the first transistor is connected to a fixed power supply, and a drain region of the first transistor is connected to the external power supply via a load. In the first transistor, a constant current can be made to flow between the source region and the drain region based on the input voltage. A constant-current drive system in which the semiconductor integrated circuit and the external resistor have been mounted on a circuit board is also constructed.


    Access

    Download


    Export, share and cite



    Title :

    Circuit and constant-current drive system having adjustable constant current output


    Contributors:

    Publication date :

    2021-05-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES , Systeme zum Regeln elektrischer oder magnetischer Veränderlicher / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / H05B ELECTRIC HEATING , Elektrische Heizung



    LED constant-current drive circuit with voltage-drop constant-current drive unit and device

    CHEN JIA / HU LIHUA / LIU HEMING | European Patent Office | 2015

    Free access

    CONSTANT CURRENT CIRCUIT

    FUJITA SHINYA | European Patent Office | 2022

    Free access

    Constant-current control circuit and automobile low-voltage constant-current system

    WU ZONG LIANG | European Patent Office | 2022

    Free access

    Anti-offset staged constant-current constant-voltage output wireless charging system

    XIA LIN / HONG XIAO / ZHANG WEIFENG et al. | European Patent Office | 2022

    Free access

    Wireless charging system capable of automatically switching constant current/constant voltage output modes

    ZHU CHONG / YIN CHENGLIANG / YANG SHUYU et al. | European Patent Office | 2022

    Free access