A power supply controller circuit in one embodiment comprises a power switch, a multifunction circuit, and a control circuit. The power switch comprises a source and a drain respectively coupled to first and second terminals of the power supply controller circuit. The multifunction circuit comprises a first input that is coupled to a third terminal of the controller circuit, wherein the third terminal is to receive a first current control signal, and wherein the multifunction circuit is to generate a second current control signal in response to the first current control signal. The control circuit generates a switching waveform to drive a control input of the power switch in response to: an oscillating signal, a signal that is representative of current flowing through the power switch, and the second current control signal.