Universal digital controller design for dc/dc switching power supplies used in displays

An apparatus comprising

• a switching circuit, coupled to an inductor, a capacitor and a display device connected in parallel to the capacitor, configured to perform a plurality of commutation cycles to provide an output current, wherein an average value of the output current during a commutation cycle is in part a function of a peak inductor current value;
• a voltage sensor configured to compare a voltage across the capacitor to a target voltage value;
• and
• a digital controller, coupled to the switching circuit and to the voltage sensor, configured to:
• receive the target voltage;
• selectively operate in at least one of a first state for a first time period, a second state for a second time period, and a third state for a third time period, wherein operating in the first state includes performing the plurality of commutation cycles to generate a first average value of the output current, operating in the second state includes performing the plurality of commutation cycles to generate a second average value of the output current, and operating in the third state results in maintaining a substantially zero average value of the output current, and
• for the received target voltage, dynamically adjust the peak inductor current value such that the third time period diminishes over a plurality of iterations through the first, second, and third states, and the voltage across the capacitor converges towards the target voltage.