Active feedback control integrated circuit applied to an alternating current/direct current converter and operation method thereof

An active feedback control integrated circuit applied to an alternating current/direct current converter, the active feedback control integrated circuit comprising:

• a feedback pin for receiving a feedback current of an output feedback unit of the alternating current/direct current converter;
• an operation unit coupled to the feedback pin for generating an operation signal according to the feedback current;
• a control unit coupled to the operation unit for generating a current control signal;
• and
• a controlled-current generation unit coupled to the control unit for generating a controlled current to the feedback pin according to the current control signal, wherein the controlled-current generation unit comprises:
• a first operational amplifier coupled to the control unit for receiving the current control signal;
• a transistor coupled to the first operational amplifier;
• a first resistor coupled between the transistor and ground, wherein the first operational amplifier, the transistor, and the first resistor are used for generating a controlled reference current according to the current control signal;
• and
• a current mirror coupled to the transistor and a first current source for generating and outputting the controlled current according to the controlled reference current and the first current source.

An active feedback control integrated circuit applied to an alternating current/direct current converter, the active feedback control integrated circuit comprising:

• a feedback pin for receiving a feedback current of an output feedback unit of the alternating current/direct current converter;
• an operation unit coupled to the feedback pin for generating an operation signal according to the feedback current;
• a control unit coupled to the operation unit for generating a current control signal;
• and
• a controlled-current generation unit coupled to the control unit for generating a controlled current to the feedback pin according to the current control signal, wherein the controlled-current generation unit comprises:
• a first current source, wherein the first current source is changed according to a detection voltage;
• a first switch coupled to a first resistor;
• a second switch coupled to a second resistor, the first switch, and the feedback pin;
• and
• a third switch coupled to the first current source, the first switch, the second switch, and the feedback pin;
• wherein the current control signal is used for controlling turning-on and turning-off of the first switch, the second switch, and the third switch.

An operation method of an active feedback control integrated circuit applied to an alternating current/direct current converter, the active feedback control integrated circuit comprising a feedback pin, an operation unit, a control unit, and a controlled-current generation unit, wherein the controlled-current generation unit comprises a first current source, a first switch, a second switch, and a third switch, the operation method comprising:

• receiving an auxiliary voltage generated by the alternating current/direct current converter;
• the operation unit detecting a plurality of switch signals transmitted to a switch of a primary side of the alternating current/direct current converter and a feedback current received by the feedback pin from an output feedback unit of the alternating current/direct current converter to generate an operation signal;
• the control unit generating and outputting a current control signal according to the operation signal;
• and
• the controlled-current generation unit generating a controlled current to the feedback pin by controlling turning-on and turning-off of the first switch, the second switch, and the third switch according to the current control signal.

An operation method of an active feedback control integrated circuit applied to an alternating current/direct current converter, the active feedback control integrated circuit comprising a feedback pin, an operation unit, a control unit, and a controlled-current generation unit, the operation method comprising:

• the feedback pin receiving a feedback current of an output feedback unit of the alternating current/direct current converter;
• the operation unit generating an operation signal according to the feedback current;
• the control unit controlling turning-on and turning-off of a switch of the control unit according to the operation signal;
• the control unit generating a current control signal according to turning-on and turning-off of the switch of the control unit;
• and
• the controlled-current generation unit generating a controlled current to the feedback pin according to the current control signal.

An operation method of an active feedback control integrated circuit applied to an alternating current/direct current converter, the active feedback control integrated circuit comprising a feedback pin, an operation unit, a control unit, and a controlled-current generation unit, the operation method comprising:

• the feedback pin receiving a feedback current of an output feedback unit of the alternating current/direct current converter;
• the operation unit generating an operation signal according to the feedback current;
• the control unit generating a number according to the operation signal;
• the control unit converting the number into the current control signal;
• and
• the controlled-current generation unit generating a controlled current to the feedback pin according to the current control signal.