A control circuit for switched power supplies, for example for battery chargers, including a driving comparator of the generator of the primary current peaks generated by a power transistor that drives a load via a transformer. The aforementioned driving comparator has comparison inputs coupled to an amperometric sensor and to a circuit for determining the value of the aforementioned primary current peaks, for which the voltage applied to the load is a function of the value of the primary current peaks. The determination circuit is coupled to at least one feedback comparator and configured to regulate the value of the primary current peaks, thereby regulating the voltage applied to the load keeping the mean frequency, of the peaks close to the oscillation frequency of the clock that drives the generator.