Stmicroelectronics (rousset) Sas

Stmicroelectronics S.a.

Stmicroelectronics (grenoble 2) Sas

Philippe Bienvenu

Antoine Pavlin

Julia Castellan

Antonio Calandra

Sandra Mattei

The present disclosure relates to a method comprising: applying, by a control circuit, a first pulsed signal, consisting of sequential first voltage pulses, to the gate of a power transistor supplying a capacitive load of the circuit, the pulses of the first pulsed signal being separated from each other by a first wait time; further to one or more of the pulses of the first signal, making a comparison, by a comparator, of the value of the voltage across the capacitive load with a first voltage threshold value; and, if the first voltage threshold value is exceeded, applying a second pulsed signal, consisting of sequential second voltage pulses, to the gate of the power transistor, the pulses of the second pulsed signal being separated from each other by a second wait time shorter than the first wait time.

Method and circuit for power-up of an electronic circuit

A protection circuit for a transistor switch coupled to a power supply rail operates to modulate a control voltage at a control terminal of the transistor switch. A first circuit detects an overload across the terminals of the switch with respect to a threshold to generate a signal which modulates the control voltage. A second circuit operates to adjust a value of the threshold in response to sensed variations in a supply voltage at the power supply rail.

Circuit for protecting a power switch

A method includes simultaneously controlling several transistors by a first signal and separately controlling the transistors by distinct second pulsed signals.

Transistor control circuit

In one embodiment, a circuit includes a plurality of elementary transistors connected in parallel between a node of application of a first potential of a power supply voltage and a node for coupling a load. The plurality of transistors includes a first assembly of elementary transistors having their gates coupled to a control node by a first circuit and a second assembly of elementary transistors having their gates coupled to the control node by a second circuit. The second circuit has two states, where the first and second circuits are configured to supply a substantially identical control voltage to the gates of the first and second assemblies of elementary transistors when the second circuit is in one of the two states.

Electronic circuit

A circuit includes a current source series-connected with a load between first and second terminals and an element coupled in parallel with the load between the first and second terminals. A value of a current in the current source is controlled based on a current flowing in the element between the first and second terminals. The value of the current in the current source is controlled proportional to power consumption in the load based on the current flowing in the element between the first and second terminals. The element is used to limit a voltage across the load while the value of the current is being controlled.

Powering of a charge with a floating node

A circuit includes a current source intended to be series-connected with a load between two terminals of application of a first D.C. voltage. An element limits the voltage across the load and a circuit controls the value of the current in the current source with the current flowing in the element.

Power supply of a load at a floating-potential

The disclosure concerns circuitry for controlling a power transistor of a drive circuit arranged to drive an electrical component, the circuitry comprising: a variable current source adapted to set the level of a current for charging a control terminal of said power transistor; and a control circuit adapted to control said variable current source in a continuous manner based on a feedback voltage.

Low electromagnetic emission driver

A device for protecting a circuit against a polarity reversal of a connection to a D.C. power supply, comprising a controllable switch interposed on said connection between a first terminal of a first voltage of the D.C. power supply and a first terminal of the circuit, and first means for turning-off with a delay the switch in the presence of a reverse polarity.

Device of protection against a polarity reversal

The detection of the presence of a load associated with a power MOS transistor integrated with its control circuit using a filtering time delay in generating a detection signal with respect to the occurrence of a turn-off control order of the power transistor, and where the filtering time delay is controlled with the power transistor switching time.

Circuit for controlling a power MOS transistor and detecting a load in series with the transistor

The detection of the presence of a load associated with a power MOS transistor integrated with its control circuit, using a delay determined taking into account the detection with respect to the occurrence of a turn-off control order of the power transistor, and where the filtering time is controlled with the power transistor switching time.

The present invention relates to a potential generation circuit of charge pump type, this circuit including at least two stages formed of capacitors and of circuitry for isolating or interconnecting the capacitors, to generate an output potential by charge transfer between the stages. The circuit is driven by two control potentials oscillating between a first and a second value. The circuit includes a self-oscillating control circuit to generate control potentials, to eliminate time delays between charge and discharge phases.

Voltage generation circuit of charge pump type, with a self-oscillating control circuit

The present invention relates to a device of protection of a monolithic component including a MOS-type vertical diffused power transistor formed of a great number of identical cells, and a measurement transistor formed of a smaller number of cells identical to those of the power transistor, the drains and the gates of all cells being common, an inductive load being connected to the source of the power transistor, a short-circuiting circuit connected between the source of the power transistor and the source of the measurement transistor, and a control circuit that turns on the short-circuiting circuit when the power transistor turns off.

Growing community of inventors

Allauch, France

Philippe Bienvenu