Control circuit and control method for programmable power adapter

Provided are a control circuit and a control method for a programmable power adapter. The control circuit comprises a microcontroller, a controller and a timer. The controller includes a voltage error amplifier. The microcontroller has a program memory and a data memory. The controller, according to voltage feedback signals, generates multiple switching signals to adjust output voltages of the programmable power adapter. The voltage error amplifier generates voltage feedback signals according to a voltage reference signal and the output voltages of the programmable power adapter. The gains of the voltage error amplifier and the value of the reference signal are programmed by the microcontroller.