Single-stage power supply with power factor correction and constant current output

A power supply controller comprising:

• a first input to be coupled to receive an input voltage sense signal representative of a dc input voltage of the power supply;
• a second input to be coupled to receive an output voltage sense signal representative of a dc output voltage of the power supply;
• a third input to be coupled to receive an input current sense signal representative of an input current of the power supply;
• a delayed ramp generator coupled to generate a delayed ramp signal;
• an integrator coupled to integrate the input current sense signal to generate an input charge signal;
• an arithmetic operator circuit coupled to generate an input charge control signal responsive to the input charge signal and a ratio of the input voltage sense signal to the output voltage sense signal;
• and
• a drive signal generator coupled to receive the delayed ramp signal and the input charge control signal and to regulate an output of the power supply, wherein the drive signal generator produces a drive signal responsive to the input charge control signal and the delayed ramp signal, the drive signal to be coupled to control a switch of the power supply.

A power supply controller comprising:

• a first input to be coupled to receive an input voltage sense signal representative of a dc input voltage of the power supply;
• a second input to be coupled to receive an output voltage sense signal representative of a dc output voltage of the power supply;
• a third input to be coupled to receive an input current sense signal representative of an input current of the power supply;
• a delayed ramp generator coupled to generate a delayed ramp signal;
• an arithmetic operator coupled to generate a scaled current signal that is responsive to input current sense signal and a ratio of the input voltage sense signal to the output voltage sense signal;
• an integrator coupled to integrate the scaled current signal to generate an input charge control signal;
• and
• a drive signal generator coupled to receive the delayed ramp signal and the input charge control signal and to regulate an output of the power supply, wherein the drive signal generator produces a drive signal responsive to the input charge control signal and the delayed ramp signal, the drive signal to be coupled to control a switch of the power supply.