Patent ID: 6897640

Claim:
A switched mode power supply device comprising: a power transistor configured to be periodically set to conduction according to a cyclic ratio and to supply a load; a ramp generation circuit coupled to a clock signal generator to periodically generate a ramp voltage having a starting point; an amplifier error circuit configured to generate an error voltage representative of a difference between a reference voltage and said regulated voltage; a comparator configured to generate a comparison of the ramp voltage generated by said ramp generation circuit with said error voltage to provide an output signal based on the comparison for controlling said power transistor; and a desynchronization circuit having an input coupled to an output of the comparator; a first output coupled to a control terminal of the power transistor, a second output coupled to a control input of the ramp generation circuit, a first leg coupled between the input and the first output, and a second leg coupled between the input and the second output, the first leg including a delay element configured to delay the setting to conduction of the power transistor so as to desynchronize the starting point of the ramp voltage and said setting to conduction.