Synchronous converter designed as a synchronous flyback converter, comprising a transformer (11A, 11B) having a predetermined winding ratio, which couples together a supply side and a load side of the synchronous converter, which are each assigned limiting currents (15', 15", 24', 24"); a first switching device controlled with a first, pulse-width-modulated control signal, wherein the first control signal is configured to be active in a first time span (t1 - t2) of a periodic operating cycle of the synchronous converter in order to close the first switching device and, in this time span, to enable a flow of a current on one side from the supply side and the load side; on the load side, a filter capacitor and a second switching device controlled with a second, pulse-width-modulated control signal, wherein the second control signal is configured to be active in a second time span (t3 - t4) of the periodic operating cycle of the synchronous converter in order to close the second switching device in this time span and to enable a flow of a current on another side from the supply side and the load side; detection means which are configured to detect a current (15, 24) on one side from the supply side and the load side; conversion means, which are configured to provide the limiting currents (24', 24") of the other side from the supply side and from the load side, converted via the predetermined winding ratio, as corresponding limiting currents (15*, 15**) on the one side; and comparison means, which are configured to compare the detected current to the limiting currents (15', 15") of the one side and to the corresponding limiting currents (15*, 15**) on the one side. a transformer (11A, 11B) having a predetermined winding ratio, which couples together a supply side and a load side of the synchronous converter, which are each assigned limiting currents (15', 15", 24', 24"); a first switching device controlled with a first, pulse-width-modulated control signal, wherein the first control signal is configured to be active in a first time span (t1 - t2) of a periodic operating cycle of the synchronous converter in order to close the first switching device and, in this time span, to enable a flow of a current on one side from the supply side and the load side; on the load side, a filter capacitor and a second switching device controlled with a second, pulse-width-modulated control signal, wherein the second control signal is configured to be active in a second time span (t3 - t4) of the periodic operating cycle of the synchronous converter in order to close the second switching device in this time span and to enable a flow of a current on another side from the supply side and the load side; detection means which are configured to detect a current (15, 24) on one side from the supply side and the load side; conversion means, which are configured to provide the limiting currents (24', 24") of the other side from the supply side and from the load side, converted via the predetermined winding ratio, as corresponding limiting currents (15*, 15**) on the one side; and comparison means, which are configured to compare the detected current to the limiting currents (15', 15") of the one side and to the corresponding limiting currents (15*, 15**) on the one side.