The control method of isolated converter, control circuit and Switching Power Supply

This application provides a kind of control method of isolated converter, control circuit and Switching Power Supply.In the control circuit and method, wake-up signal is produced by setting different threshold values during the different working modes of isolated converter, so as to can both make isolated converter be in the output voltage during dynamic load to fall value smaller, to accelerate the dynamic responding speed of system, isolated converter can be made again during the load steady state of standy operation mode, worked with low-down working frequency, effectively reduce idling consumption.