Power controller, switching mode power supply and control method

The invention provides a power supply controller, a switching mode power supply and a control method, and relates to the technical field of electronics, the switching mode power supply is used for providing output voltage and comprises an inductance component and a power switch, the power switch is used for controlling current flowing through the inductance component, and the control method comprises the following steps: providing a compensation signal controlled by the output voltage; providing a stable compensation signal for a low-frequency component of the compensation signal according to the compensation signal; providing a hybrid operation mode in which the switched mode power supply alternately operates in a switching operation period in which the power switch is turned on at least once and a neglect period in which the power switch is turned off; one of the switching operation period and the ignoring period is stopped and the other of the switching operation period and the ignoring period is started a