Further, the switching converter can control the conduction phases of the power switches of the interleaved parallel branches not to be overlapped when operating in the steady state, in order to reduce the ripple. The turn-on moment the power switches of each of the interleaved parallel branches may be controlled to be turned on is determined by comparing the compensation signal and the ripple signal. For example, when the comparison result satisfies the predetermined condition, one of the interleaved parallel branches can be selected in a predetermined order, and the power switch of the selected interleaved parallel branch may be triggered to be turned on. For example, the on-time of the power switch of the master interleaved parallel branch can be controlled in a constant on-time mode, and the on-time of the power switch of each slave interleaved parallel branch may be controlled according to the difference between the inductor current of corresponding slave interleaved parallel branch and the inductor current of the master interleaved parallel branch. In this way, the dynamic response performance of the system can be improved by controlling the conduction phases of the power switches of the interleaved parallel branches to be overlapped when the load changes from the light load to the heavy load.

The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with modifications as are suited to particular use(s) contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.