Modulated quasi-resonant peak-current-mode control

A method, comprising:

• receiving a current signal indicative of whether load current flowing through a load has reached a reference current;
• receiving a valley detection signal indicating that the load current crosses zero;
• generating a modulation signal having an ON-time that is based at least on a desired amount of current to be supplied to the load;
• and
• generating a control signal for a switching device that controls supply of current to the load, wherein the control signal includes a pulse to cause the switching device to operate an ON state in which current is supplied to the load, wherein generating the control signal includes:
• generating a rising edge of the pulse when i) the modulation signal is high and ii) a valley detection signal is received;
• and
• generating a falling edge of the pulse when the current signal indicates that the load current has reached the reference current.

Driver circuitry configured to generate a control signal for a switching device that controls supply of load current to a load, the driver circuitry comprising:

• comparator circuitry configured to generate a current signal indicative of whether the load current has reached a reference current;
• brightness color control unit circuitry (BCCU) configured to generate a modulation signal having an ON-time that is based at least on a desired amount of current to be supplied to the load;
• capture and control unit circuitry (CCU) configured to generate the control signal based at least on the current signal and the modulation signal, wherein the CCU comprises a counter configured to:
• generate a rising edge of the control signal in response to counting a certain number of increments after a zero crossing of the load current is detected;
• and
• generate a falling edge of the control signal in response to a falling edge of the CCU signal.