Dialog Semiconductor (uk) Limited

Danilo Gerna

Enrico Pardi

Nicolo Nizza

Stefano Scaldaferri

John William Kesterson

Francesco Dalena

Giovanni Tarroboiro

Marcus Weis

Alexandre Morello

Tommaso Baldetti

A current sense circuit for a pass transistor is described. The circuit comprises a sense transistor having input and control ports that are coupled to input and control ports respectively of the pass transistor. The circuit comprises a differential amplifier comprising a differential input and output. An output port of the pass transistor is coupled to a first port of the differential input and an output port of the sense transistor is coupled to a second port of the differential input. The differential amplifier comprises a first sub-amplifier and a second sub-amplifier that are arranged in parallel and which are operated in an auto-zero phase and in an amplification phase in an alternating manner, and which are operated in the auto-zero phase in a mutually exclusive manner. The output of the differential amplifier is used to control voltage drops across the sense transistor and the pass transistor.

Accurate current sensing

A circuit for providing a current flowing from a supply voltage into an electric load is presented. The circuit comprises a first circuit branch connected between the supply voltage and an output node connected to the electric load, wherein the first circuit branch comprises a first transistor device, a second circuit branch connected between the supply voltage and a predetermined voltage level, wherein the second circuit branch comprises a series connection of a second transistor device that is a scaled replica of the first transistor device and a current source. The control terminals of the first and second transistor devices are connected to each other. A control circuit is configured to control the voltage at the control terminal of the first transistor device depending on a current flowing through the first transistor device. The application further relates to a method of operating such circuit.

Circuit and method for high-accuracy current sensing

A switching mode power converter circuit and a method are presented. The circuit comprises a first transistor switch and a second transistor switch coupled in series between an input voltage level and ground. There is a control circuit for controlling switching operation of the first transistor switch and the second transistor switch. There is a detection circuit for sensing a voltage at an intermediate node arranged between the first transistor switch and the second transistor switch, for deriving an indication of a slope of the sensed voltage, and for generating a switching control signal for the control circuit on the basis of the derived indication of the slope of the sensed voltage. The control circuit sets a first timing for activating the first transistor switch and/or a second timing for activating the second transistor switch on the basis of the switching control signal.

Nulling reverse recovery charge in DC/DC power converters

A battery charging regulator for use with a charger. The regulator comprises a switch element coupled to a control-circuit and to an adjuster-circuit. The switch element is adapted to selectively couple an input provided by a DC-DC converter with an output for a battery. The switch element comprises a control terminal and first and second path terminals located at a first and a second end of a conductive path respectively. The control-circuit is adapted to adjust an input to the control terminal to regulate at least one of a charge current and a charge voltage supplied to the battery via the conductive path. The adjuster-circuit is adapted to sense an electrical parameter of the switch element; and to adjust a value of the input provided by the DC-DC converter based on the sensed electrical parameter value.

Battery charging regulator

A current sense circuit for a pass transistor is described. The current sense circuit comprises a sense transistor, a differential amplifier comprising a differential input and a differential output, and a differential difference amplifier, referred to as DD amplifier, comprising a main differential input, an auxiliary differential input and an output; wherein the differential output of the differential amplifier is coupled to the auxiliary differential input of the DD amplifier; wherein the output port of the pass transistor is coupled to a first port of the main differential input and wherein the output port of the sense transistor is coupled to a second port of the main differential input. The output of the DD amplifier is used to control a voltage drop across the sense transistor and the pass transistor.

VDS equalizer offset compensation for a current sense circuit

This application relates to a circuit for determining whether a first transistor device is in a predetermined operation mode. The circuit comprises comprising: a second transistor device, wherein control terminals of the first and second transistor devices are connected, and one of input and output terminals of the first transistor device is connected to the other one of input and output terminals of the second transistor device, a buffer amplifier connected between the one of input and output terminals of the first transistor device and the other one of input and output terminals of the second transistor device, and circuitry for determining whether the first transistor device is in the predetermined operation mode based on an indication of a current flowing through the second transistor device. The application further relates to a method of determining whether a first transistor device is in a predetermined operation mode.

Growing community of inventors

Leghorn, Italy

Danilo Gerna