Patent ID: 6972530

Claim:
An apparatus for adjusting the dynamic range of a charging current within an open-loop LED driver circuit, the apparatus, comprising: a selection signal circuit that is arranged to produce a selection signal, wherein the selection signal corresponds to a logic low level during a first region and the selection signal corresponds to a logic high level during a second region; a charge current circuit that is arranged to produce the charge current in response to the selection signal, wherein a resistance circuit is selected to have a first resistance during the first region and a second resistance during the second region; and a selected capacitance circuit that is arranged to select a first capacitance during the first region in response to the selection signal and is arranged to select a second capacitance during the second region in response to the selection signal, wherein selecting the first capacitance and first resistance transparently reduces the dynamic range of the charging current during the first region, and selecting the second capacitance and second resistance transparently reduces the dynamic range of the charging current during the second region.