Patent ID: 8963445
Filing Date: 2015-02-24
Classification: H05B

Abstract:
1. A driver circuit of light sources, in particular LEDs, comprising: a selection circuit including a resistive selection element having a terminal connected to the power supply voltage and having an electric resistor level corresponding to a short-circuit, an open circuit or a medium impedance; an electronic control unit (ECU) including a reference circuit that provides a reference electric quantity, and a regulation circuit of the driver current that establishes a driver current of the light sources on the basis of said reference electric quantity, said reference circuit includes: a levels acquisition circuit that acquires at least one electric selection signal associated with the electric resistor level of the resistive selection element and provides selection information relative to said level of electric resistance; and a levels definition circuit that receives said selection information and provides, in response to said selection information, the reference electric quantity from a plurality of predefined levels of electric reference quantity, wherein said levels acquisition circuit includes two level acquisition transistors, the on or off state of which depends on the resistor level of the selection resistor element, and two current-controlled output switches, each controlled by a respective level acquisition transistor and having an output terminal connected to the levels definition circuit.