Flyback transformers come in two forms: CCM (Continuous On-Mode) and DCM (Discontinuous On-Mode). We will introduce the DCM mode here.
The idea behind DCM flyback is to bring the SEC (secondary) current back to zero before the next on-time of the PRI (primary) current loop. Typically, DCM flyback is designed between CCM and DCM.
Please see the attachment for details.
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