Patent ID: 8803432

Claim:
A load control circuit for controlling a target intensity level of a lighting load, said load control circuit comprising: a bus-voltage-generating circuit receiving a phase-control voltage having a duty cycle and producing a DC bus voltage; a load regulation circuit receiving said DC bus voltage and adapted to be coupled to said lighting load for adjusting the intensity of said lighting load; and a control circuit operable to determine said target intensity level of said lighting load in response to said duty cycle of said phase-control voltage, said control circuit controlling said load regulation circuit to adjust the intensity level of said lighting load in response to said duty cycle of said phase-control voltage and an actual-intensity signal related to the actual intensity level of said lighting load; wherein said control circuit adjusts said target intensity level of said lighting load using a slow time constant in response to changes in said duty cycle of said phase-control voltage that are below a threshold amount, and adjusts said target intensity level of said lighting load using a fast time constant less than said first time constant in response to intentional changes in said duty cycle of said phase-control voltage.