Method and Apparatus for Detecting CCM Operation of a Magnetic Device

A method for detecting a CCM operation of a magnetic device, comprising:

• generating a current signal in accordance with a switching current of the magnetic device;
• generating a first current signal and a second current signal by sampling the current signal;
• and
• generating a mode signal according to the first current signal and the second current signal;
• wherein the switching current is enabled by a switching signal;
• the first current signal is sampled at the middle of the on-time of the switching signal;
• and the second current signal is sampled at the end of the on-time of the switching signal;
• the mode signal indicates the magnetic device is operated in CCM or DCM.

An apparatus for detecting a CCM operation of a magnetic device, comprising:

• a first sample circuit sampling a current signal correlated to a switching current of the magnetic device to generate a first current signal;
• a second sample circuit sampling the current signal to generate a second current signal;
• and
• an arbiter generates a mode signal according to the first current signal and the second current signal, the mode signal indicating the magnetic device is operated in CCM or DCM.