Control circuit with multiple feedback loops and switching power supply thereof

A control circuit with multiple feedback loops configured for a switching power supply, the control circuit comprising:

• a) a plurality of feedback circuits configured to receive a plurality of feedback signals of a power stage circuit, and to correspondingly generate a plurality of error signals;
• b) a plurality of switching circuits configured to transfer said plurality of error signals to a compensation circuit, wherein each of said plurality of switching circuits is correspondingly coupled to one of said plurality of feedback circuits, and wherein only one of said plurality of switching circuits is turned on to correspondingly transfer one of said error signals to said compensation circuit when in a steady status;
• c) said compensation circuit being configured to receive said plurality of error signals, and to generate a compensation signal;
• and
• d) a pulse-width modulation (PWM) control circuit configured to receive said compensation signal, and to generate a PWM control signal to control operation of a power switch in said power stage circuit.