Switching power supply apparatus

摘要

A switching power supply apparatus is provided, wherein an optimal blanking interval can be obtained for an entire load range. The switching power supply apparatus is configured such that an on-blanking pulse signal generating circuit 31 generates a blanking pulse signal based on an error voltage signal VEAO, and sets a blanking interval that corresponds to the load condition. For example, the reference voltage and the voltage value of the error voltage signal VEAO are compared and the blanking pulse signal that shortens the blanking interval is generated during a light load, that is, when the voltage value of the error voltage signal VEAO is less than or equal to the reference voltage.