Patent ID: 8633652

Claim:
A driver device to produce a regulated current from an input voltage, the driver device comprising: a driver transistor for providing said regulated current; and a stabilization circuit to produce, from said input voltage, a stabilized reference voltage to be applied to said driver transistor; wherein said stabilization circuit comprises: a first bipolar stabilization transistor and a second bipolar stabilization transistor, the base-emitter voltage of said second stabilization transistor determining said stabilized reference voltage for said driver transistor; a voltage divider comprising a first resistance and a second resistance, said voltage divider being interposed between the bases of said first and said second stabilization transistors, with the first resistor connected between the base of said second stabilization transistor and said partition point of said voltage divider and the partition point acting on the base of the first stabilization transistor; and a polarization network to determine the base-emitter voltages of said first and said second stabilization transistors, wherein: said first resistance of said voltage divider has a value lower than the value of said second resistance of said voltage divider, and the base-emitter voltage of said first stabilization transistor is higher than the base-emitter voltage of said second stabilization transistor.