Spread spectrum switching converter and spread spectrum control method thereof

A spread spectrum control method, which is configured to operably control a spread spectrum switching converter, wherein the spread spectrum switching converter is configured to operably switch at least one switch thereof according to a control signal, to convert an input power to an output power;

• the spread spectrum control method comprising:
• modulating a pulse width according to a feedback signal related to the output power, to generate an initial pulse width modulation (PWM) signal, so as to control the at least one switch to switch an inductor to generate the output power;
• generating a pulse omission control signal, wherein pulses of the initial PWM signal are masked during a pulse width of the pulse omission control signal, thus generating an adjusted PWM signal to thereby generate the control signal;
• and
• randomly varying the pulse width of the pulse omission control signal based on a random control signal, so as to randomly vary a range of the pulses being masked in the initial PWM signal, such that the adjusted PWM signal exhibits a spread spectrum characteristic.