A power supply including a power converter circuit operated in a constant ON-time control mode, the power supply comprising: a reference voltage generator circuit operable to produce a varying reference voltage ; a ramp generator circuit operable to produce a ramp voltage signal , a magnitude of which is offset by the varying reference voltage ; and a control circuit operable to control activation of switch circuitries of the power converter circuit to generate an output voltage to power a load based on a magnitude of the ramp voltage signal with respect to an output voltage feedback signal of the power supply, characterized in that the reference voltage generator circuit further includes: a bias circuit (R2, 220) configured to bias the varying reference voltage towards a bias voltage value over time, a transconductance amplifier configured to compare a magnitude of the output voltage feedback signal to a received reference voltage , the transconductance amplifier operable to generate an output current , a magnitude of which depends on a difference between the magnitude of the output voltage feedback signal and the received reference voltage , and a capacitor (C2), the capacitor (C2) operable to receive the output current generated by the transconductance amplifier to produce the varying reference voltage , wherein the bias circuit (R2, 220) is coupled to the capacitor (C2) and is configured to apply a bias current to the capacitor (C2). a reference voltage generator circuit operable to produce a varying reference voltage ; a ramp generator circuit operable to produce a ramp voltage signal , a magnitude of which is offset by the varying reference voltage ; and a control circuit operable to control activation of switch circuitries of the power converter circuit to generate an output voltage to power a load based on a magnitude of the ramp voltage signal with respect to an output voltage feedback signal of the power supply, characterized in that the reference voltage generator circuit further includes: a bias circuit (R2, 220) configured to bias the varying reference voltage towards a bias voltage value over time, a transconductance amplifier configured to compare a magnitude of the output voltage feedback signal to a received reference voltage , the transconductance amplifier operable to generate an output current , a magnitude of which depends on a difference between the magnitude of the output voltage feedback signal and the received reference voltage , and a capacitor (C2), the capacitor (C2) operable to receive the output current generated by the transconductance amplifier to produce the varying reference voltage , wherein the bias circuit (R2, 220) is coupled to the capacitor (C2) and is configured to apply a bias current to the capacitor (C2). a bias circuit (R2, 220) configured to bias the varying reference voltage towards a bias voltage value over time, a transconductance amplifier configured to compare a magnitude of the output voltage feedback signal to a received reference voltage , the transconductance amplifier operable to generate an output current , a magnitude of which depends on a difference between the magnitude of the output voltage feedback signal and the received reference voltage , and a capacitor (C2), the capacitor (C2) operable to receive the output current generated by the transconductance amplifier to produce the varying reference voltage , wherein the bias circuit (R2, 220) is coupled to the capacitor (C2) and is configured to apply a bias current to the capacitor (C2). <EOS>