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

摘要

An active feedback control integrated circuit applied to an alternating current/direct current converter includes a feedback pin, an operation unit, a control unit, and a controlled-current generation unit. The feedback pin is used for receiving a feedback current of an output feedback unit of the alternating current/direct current converter. The operation unit is used for generating an operation signal according to the feedback current. The control unit is coupled to the operation unit for generating a current control signal. The controlled-current generation unit is coupled to the control unit for generating a controlled current to the feedback pin according to the current control signal.

主权项

1. 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, wherein the control unit comprises:
a switch having a control terminal coupled to the operation unit for being turned on and turned off according to the operation signal;a first current source coupled to a first voltage;a capacitor coupled between the first current source and ground; anda second resistor coupled between the switch and the ground;wherein when the switch is turned off, the current control signal is generated according to the first current source and the capacitor; and when the switch is turned on, the current control signal is generated according to the first current source, the capacitor, and the second resistor; 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.