Biasing and driving circuit, based on a feedback voltage regulator, for an electric load

An electronic system, comprising:

• a feedback voltage regulator circuit having a feedback loop including a feedback input terminal configured to receive a sensing voltage that is a function of a supply current through an electronic load, and the feedback voltage regulator configured to regulate, on the basis of the sensing voltage, the supply current;
• a resistive sensing element, operatively coupled to the feedback input terminal, configured to receive the supply current and to generate the sensing voltage as a function of the supply current;
• a current transducer coupled to the feedback input terminal;
• and
• an auxiliary biasing circuit configured to receive an alternating input voltage and to supply through the current transducer an alternating auxiliary biasing current that is inversely proportional to the alternating input voltage.

A method of controlling a feedback voltage regulator circuit, the method comprising:

• generating a sensing voltage as a function of a supply current through an electronic load coupled to the feedback voltage regulator circuit;
• coupling the sensing voltage to a feedback input of the feedback voltage regulator circuit to generate a feedback voltage on the feedback input;
• generating an alternating auxiliary biasing current that is inversely proportional to an alternating input voltage;
• and
• providing the alternating auxiliary biasing current to the feedback input to thereby control the value of the feedback voltage on the feedback input.