Driver circuit of light sources and vehicle light provided with said driver circuit of light sources

Driver circuit of light sources, particularly of the LED type, comprising a first and at least a second group of light sources, each connected to a common power supply terminal, a first and at least a second regulation circuit, each suitable for regulating the current absorbed by a respective group of light sources, at least one actuation circuit operatively connected to a respective second regulation circuit, and serial connection circuit, suitable for connecting in series at least a first and a second group of light sources, when the voltage downstream of the first group of light sources is greater than or equal to the voltage upstream of the second group of light sources,

• wherein the regulation circuit of a first group of light sources, the actuation circuit and the regulation circuit of a second group of light sources are configured in such a way that:
• when the voltage downstream of said first group of light sources is less than the voltage upstream of said second group of light sources, the first group of light sources is driven by the respective regulation circuit, while the actuation circuit inhibits the functioning of the second regulation circuit and drives the second group of light sources, on the basis of a reference electric magnitude of said second regulation circuit, in such a way that the first and the second group of light sources are driven in parallel;
• when the voltage downstream of the first group of light sources is greater than or equal to the voltage upstream of the second group of light sources, the first and the second group of light sources connected in series with each other are driven by the second regulation circuit, the first regulation circuit and the actuation circuit being inhibited.