Load control device for a light-emitting diode light source

A method for controlling an amount of power delivered to an electrical load, the method comprising:

• controlling an average magnitude of a load current through the electrical load in a normal mode and in a burst mode, wherein the burst mode comprises at least one burst mode period that comprises a first time period associated with an active state and a second time period associated with an inactive state, and a duration of the first time period associated with the active state is determined based on a burst duty cycle;
• and
• during the normal mode, adjusting a target load current based on a targeted amount of power to be delivered to the electrical load to regulate the average magnitude of the load current while holding the burst duty cycle constant;
• wherein, during the burst mode, the method further comprises, based on the target amount of power, adjusting the burst duty cycle and adjusting the target load to regulate the average magnitude of the load current, wherein adjusting the target load current comprises:
• determining a current offset that ranges from a minimum current offset to a maximum current offset based on the burst duty cycle and the target amount of power;
• and
• adjusting the target load current by the current offset.

A method for controlling an amount of power delivered to an electrical load, the method comprising:

• adjusting an average magnitude of a load current in a normal mode and in a burst mode;
• regulating the average magnitude of the load current between a maximum rated current and a minimum rated current in the normal mode;
• regulating the average magnitude of the load current below the minimum rated current in the burst mode by regulating a peak magnitude of the load current towards a target load current during a first time period of the burst mode and stopping regulating the load current during a second time period of the burst mode;
• and
• increasing the load current from an initial current to the target load current over a ramp time period at a beginning of the first time period of the burst mode.