Led control and driving circuit capable of both analog and digital dimming

A method, comprising:

• receiving a plurality of digital feedback signals from a voltage converter;
• controlling the voltage converter based upon a user desired brightness level and the plurality of digital feedback signals, the voltage converter receiving input from a DC voltage bus and providing output to drive a lighting load;
• and
• receiving a plurality of feedback signals from a power factor correction circuit that receives a rectified mains voltage and provides output to the DC voltage bus, and based thereupon operate the power factor correction circuit in transition mode or discontinuous mode based upon the user desired brightness level and a threshold brightness;
• wherein the plurality of feedback signals include an input sense signal that is a function of the rectified mains voltage as drawn by the power factor correction circuit and an output sense signal that is a function of the output provided to the DC voltage bus;
• when the output sense signal is not within a threshold of a desired voltage and the output sense signal is less than the threshold, increasing a pulse width of a power factor correction gate drive signal for controlling a transistor in a peak current detect signal generation circuit;
• and
• when the output sense signal is not within the threshold of the desired voltage and the power factor correction output voltage sense signal is higher than the threshold, decreasing the pulse with of the power factor correction gate drive signal.

A method, comprising:

• receiving a rectified mains voltage at a power factor correction circuit and providing output of the power factor correction circuit to a DC voltage bus;
• generating a plurality of feedback signals including an input sense signal that is a function of the rectified mains voltage as drawn by the power factor correction circuit, an output sense signal that is a function of output provided to the DC voltage bus, a zero crossing detect signal that is a function of zero crossings of an inductor current in the power factor correction circuit, and a peak current detect signal generated based upon instances of the inductor current exceeding a threshold current;
• receiving input from the DC voltage bus at a voltage converter and driving a string of light emitting diodes (LEDs) using the voltage converter;
• receiving a plurality of digital feedback signals from the voltage converter;
• controlling the voltage converter based upon a user desired brightness level and the plurality of digital feedback signals;
• and
• receiving a plurality of feedback signals from the power factor correction circuit, and based thereupon:
• operating the power factor correction circuit in transition mode when the user desired brightness level is above a threshold brightness, and
• operating the power factor correction circuit in discontinuous mode when the user desired brightness level is below the threshold brightness.