This paper proposes a simple tuning algorithm for digital deadbeat control based on error correlation. By injecting a square wave reference input and calculating the correlation of the control error, a gain correction for deadbeat control is obtained. The proposed tuning algorithm is successfully applied also in predictive algorithms which use disturbance observers for the compensation of input voltage variations and any other source of errors, such as dead-times, parameter and model mismatches. The proposed solution is simple, it requires short tuning time, it is suitable for different dc-dc converter topologies and it seems to be compliant with the cost/complexity constraint of integrated digital ICs. Simulation and experimental results on synchronous buck converters confirm the properties of the proposed solution
