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A new magamp technique for multiwinding flyback converters is proposed. Ideal operating principle and analysis are presented. The practical circuit operation is limited due to the nonideal component characteristics. An analytical model for studying the phenomenon is provided. Based on the model, the mechanism of the boundary condition that causes the converter to be out of regulation is explored. Experimental verifications on a 20 W two-output flyback converter are conducted. They illustrate the effectiveness of the proposed magamp approach and the accuracy of the presented analytical model.