Dimming control circuit

A dimming control circuit, comprising:

• an input terminal for receiving an input signal;
• a digital dimming circuit for receiving the input signal and generating a digital signal;
• an analog dimming circuit for receiving and generating an analog signal;
• and
• a power circuit for converting a supply voltage to an output voltage according to the analog signal generated by the analog dimming circuit,
• wherein the digital dimming circuit includes;
• a first comparator comparing the input signal with a first reference voltage;
• a soft start device generating a voltage at a node, the soft start device being electrically connected with the output of the first comparator;
• and
• a second comparator comparing the voltage at the node with a second reference voltage and outputting a first enable signal.

A dimming control circuit, comprising:

• an input terminal for receiving an input signal;
• an analog and digital dimming circuit receiving the input signal, wherein the analog and digital dimming circuit provides an analog dimming function when a voltage level of the input signal is between a predetermined lower limit and a predetermined upper limit, and a digital dimming function when the voltage level of the input signal switches above and below the predetermined lower limit, and wherein the analog and digital dimming circuit generates an analog signal when the voltage level of the input signal is above the predetermined lower limit;
• and
• a power circuit for supplying an output current in correspondence to the analog signal generated by the analog and digital dimming circuit.