Stmicroelectronics S.r.l.

Dora S.p.a.

Domenico Attianese

Fulvio Ottavio Lissoni

Stefano Signoria

Giorgio Oddone

An electronic system includes a feedback voltage regulator circuit including input terminals receiving a rectified alternating input voltage signal and a feedback input terminal receiving a feedback voltage that is generated based on a load current through an electric load. A sensing element senses the load current through the electric load and generates sensed voltage based upon the sensed load current. A current transducer receives the sensed voltage and provides the feedback voltage based upon the sensed voltage. A current generator receives the alternating input voltage signal and provides a biasing current signal that is a function of the alternating input voltage signal to modulate the feedback voltage on the feedback input terminal based upon the alternating input voltage signal.

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

A biasing and driving circuit for an electric load, having an input adapted to receive an a.c. input voltage and an output adapted to supply a d.c. output voltage, comprising: a voltage-regulator device, having a feedback input terminal configured to receive a sensing voltage that is a function of a supply current that flows through the electric load and regulating, on the basis of the sensing voltage received, the supply current; a resistive sensing element, operatively coupled to the feedback input, configured to receive the supply current and generate the sensing voltage as a function of the supply current; a resistor coupled to the feedback input; and an auxiliary biasing circuit adapted to receive the a.c. input voltage and inject through the resistor an a.c. auxiliary biasing current that varies in a way inversely proportional to the input voltage.

Powering the internal circuitry, that is the controller of the power switch of a step-down DC-DC converter for a broad range of values of output voltage and achieving an enhanced energy saving in a low load conditions of operation is made possible by a method and implementing circuit based on defining two distinct thresholds of discrimination of the output voltage, both tied to a reference voltage, for generating two respective control signals and defining, from logical combinations of said two control signals, three distinct regions of operation of the converter upon the varying of electrical parameters, respectively identified by logical combinations of a pair of enabling signals.

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Aosta, Italy

Domenico Attianese