| 摘要 |
A technique for providing output current for one or more light-emitting semiconductor devices is provided. According to an example embodiment, the technique comprises controlling supply of said output current from a power converter means for said one or more light-emitting semiconductor devices and regulating electrical characteristics of said output current in accordance with requested light output characteristics, said regulating comprising alternately enabling and disabling provision of said output current at a selectable duty cycle to provide duty cycle based output current limitation and controlling provision of said output current at a selectable current level to enable level based output current limitation, so as to regulate the output current to exhibit an average level that corresponds to said requested light output characteristics by a combination of the duty cycle based output current limitation and the level based output current limitation in dependence of a selected one of a plurality of different predefined mapping functions. |
