Circuit arrangement and method for operating at least a 1led and second 2led

    公开(公告)号:JP2011528168A

    公开(公告)日:2011-11-10

    申请号:JP2011515131

    申请日:2008-07-04

    CPC classification number: H05B33/0827 H05B33/0851

    Abstract: A circuit configuration may include an operational amplifier having a plus and a minus input and an output; and a current sensing resistor, whereby the voltage drop across the resistor is coupled to the minus input; a first transistor having a control electrode, a reference electrode and a working electrode, the working-reference electrode path of which is coupled in series to a first and second connection for a first LED between a connection for a supply voltage and the reference potential; a second transistor having a control electrode, a reference electrode and a working electrode, the working-reference electrode path of which is coupled in series to a first and second connection for a second LED between a connection for a supply voltage and the reference potential; a first switch and a second switch coupled in series between the output and the control electrode of the first and second transistor, respectively.

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