Driver device for LEDs, and a method for providing electric current to LEDs

摘要

A driver device (201) for light-emitting diodes (204) comprises a controllable first power source (202) that produces a first voltage (V in ) at its output. The magnitude of said first voltage depends on a control signal (206). A buck converter (203) has an input coupled to the output of said first power source, and an output for coupling light-emitting diodes thereto. A load voltage indicator (205) is configured to produce an indication signal depending a load voltage required by a load coupled to the output of said buck converter. A feedback coupling couples said indication signal as a control signal (206) to said controllable first power source.