Circuits and methods for driving light sources

A controller for controlling power to a light source, said controller comprising:

• a first sensing pin operable for receiving a first signal indicating an instant current flowing through an energy storage element;
• a second sensing pin operable for receiving a second signal indicating an average current flowing through said energy storage element;
• a third sensing pin operable for receiving a third signal indicating whether said instant current decreases to a predetermined current level;
• a driving pin operable for providing a driving signal to a switch to control an average current flowing through said light source to a target current level, wherein said driving signal is generated based on one or more signals selected from said first signal, said second signal, and said third signal;
• and
• an error amplifier operable for generating an error signal based on said second signal and also based on a reference signal indicating said target current level.