A power supply with high pulse width modulation gain and low noise sensitivity has been disclosed. In one example, a control current is received at a control terminal of a regulator circuit. The control current includes a consumption current of the regulator circuit and a feedback current. A duty cycle at which a power switch is switched is adjusted in response to the feedback current. The consumption current of the regulator circuit is increased during an on-time of the power switch in response to the duty cycle at which the power switch is switched.