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How to differentiate DCM and CCM in dc/dc by a circuit?

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staric

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I need to build a circuit to differentiate DCM and CCM. The circuit should have two different output signal for the two mode. But I don't know how to start to build. I need some advice. Thanks.
 

To differentiate DCM and CCM, there are two ways to solve this issue: to detect the inductor current ; to detect the Vea.
 

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