Controller of a power converter with adjustable jitter amplitude and method of generating adjustable jitter amplitude thereof

A controller of a power converter with adjustable jitter amplitude, the controller comprising:

• a feedback pin for receiving a feedback voltage from a secondary side of the power converter, wherein the feedback voltage corresponds to an output voltage of the secondary side of the power converter;
• a logic circuit for generating an adjustable current according to a clock and a current flowing through a primary side of the power converter;
• an auxiliary pin for receiving a voltage corresponding to an auxiliary winding of the power converter;
• and
• a current sensing pin for generating a detection voltage according to the adjustable current;
• wherein the voltage, the feedback voltage, and the detection voltage are used for determining turning-on time of the primary side of the power converter.

A method of a controller of a power converter generating adjustable jitter amplitude, the controller comprising a feedback pin, a logic circuit, a current sensing pin, and an auxiliary pin, wherein the logic circuit comprises a first logic unit and a second logic unit, the method comprising:

• the feedback pin receiving a feedback voltage from a secondary side of the power converter, wherein the feedback voltage corresponds to an output voltage of the secondary side of the power converter;
• the logic circuit generating a predetermined-bit digital signal according to a clock;
• the auxiliary pin receiving a voltage corresponding to an auxiliary winding of the power converter;
• the current sensing pin generating a detection voltage according to a current flowing through a primary side of the power converter;
• and
• determining turning-on time of the primary side of the power converter according to the voltage, the predetermined-bit digital signal, and the detection voltage.