A controller for a switched mode power converter (SMPC) module for use in a multiphase SCMP is disclosed, comprising: a signal generator, configured to generate a periodic signal and a clock, both having a frequency and a signal phase, and for controlling the switched mode power converter module; a first-clock and second-clock inputs configured to receive respective first-clock and second-clock signal having the frequency and respective first and second phases from neighbouring controllers; and wherein the signal generator comprises a phase adjustment circuit configured to adjust the phase of the periodic signal so as to be equidistant from the first and second phase, wherein the phase adjustment circuit determines an error signal in dependence on an offset between the phase and a mid-point between the first phase and the second phase, and a feedback circuit configured to adjust the phase in dependence on the error signal.