A switched-mode power supply circuit configured to transfer power from an input node to an output load via an output circuit arrangement having at least two output voltage terminals (106, 108) configured to deliver a respective output voltage to the output load, the switch-mode power supply circuit comprising: AC-coupling circuitry arranged between the input node and the output load and configured to: receive a modulated signal carrying the power from the input node; and transfer energy to the output voltage terminals (106, 108); front-end control circuitry configured to be coupled to receive a feedback signal, and configured and arranged to generate controlled modulation for driving the modulated signal in response to the feedback signal by providing voltage regulation to the output load; and a capacitance-based filter circuit arranged to intercouple the output voltage terminals (106, 108) wherein in response to changes by the output load at one of the output voltage terminals, the capacitance-based filter circuit is configured and arranged to mitigate an imbalance relative to the respective output voltages delivered to the output load by the output voltage terminals, wherein the capacitance-based filter circuit includes: a first capacitor which is connected between two of the output voltage terminals (106, 108); and a second capacitor which has a capacitor terminal connected to ground or a reference voltage, characterised in that the feedback signal is received from at least one of the output voltage terminals (106,108) but from less than all of the output voltage terminals. AC-coupling circuitry arranged between the input node and the output load and configured to: receive a modulated signal carrying the power from the input node; and transfer energy to the output voltage terminals (106, 108); receive a modulated signal carrying the power from the input node; and transfer energy to the output voltage terminals (106, 108); front-end control circuitry configured to be coupled to receive a feedback signal, and configured and arranged to generate controlled modulation for driving the modulated signal in response to the feedback signal by providing voltage regulation to the output load; and a capacitance-based filter circuit arranged to intercouple the output voltage terminals (106, 108) wherein in response to changes by the output load at one of the output voltage terminals, the capacitance-based filter circuit is configured and arranged to mitigate an imbalance relative to the respective output voltages delivered to the output load by the output voltage terminals, wherein the capacitance-based filter circuit includes: a first capacitor which is connected between two of the output voltage terminals (106, 108); and a second capacitor which has a capacitor terminal connected to ground or a reference voltage, characterised in that the feedback signal is received from at least one of the output voltage terminals (106,108) but from less than all of the output voltage terminals. a first capacitor which is connected between two of the output voltage terminals (106, 108); and a second capacitor which has a capacitor terminal connected to ground or a reference voltage, characterised in that the feedback signal is received from at least one of the output voltage terminals (106,108) but from less than all of the output voltage terminals.