Stmicroelectronics (rousset) Sas

Stmicroelectronics (grenoble 2) Sas

Sebastien Ortet

Didier Davino

Cedric Thomas

Michel Cuenca

Vincent Binet

Laurent Truphemus

Remi Collette

Olivier Lauzier

A switched-mode power supply includes a voltage ramp generation circuit that generates a voltage ramp signal. The voltage ramp generation circuit includes, selectively connected in parallel, at least three capacitors. The selective connection of the capacitors is made according to a value of an internal power supply voltage of the switched-mode power supply.

Switched-mode power supply

In an embodiment, a voltage converter is configured to operate by a succession of operating cycles, each cycle comprising an energy accumulation phase and an energy restitution phase, wherein the converter is further configured to determine a duration of one of the phases by comparing a voltage ramp and a first reference voltage, and wherein a slope of the voltage ramp depends on a sign of a current in an inductor at an end of a previous operating cycle.

Voltage converter having adjustable phases

The present disclosure relates to a voltage converter and method for pulse frequency modulation-type operation during a start-up phase.

Converter and method for starting a switching power supply

In an embodiment a switching power supply includes a voltage ramp generator comprising at least one output capacitor, wherein the generator is configured such that the output capacitor has a first value during a first operating cycle of a first operating mode and a second value during subsequent operating cycles of the first operating mode.

Switched mode power supply (SMPS)

In an embodiment, a switching power supply includes: an output stage; a clock generator configured to generate a first clock signal; and a control circuit configured to control the output stage based on the first clock signal, wherein the switching power supply is configured to have a first operating mode synchronized by the first clock signal, and a second operating mode that is asynchronous, wherein the clock generator is configured to maintain the first clock signal at a constant value during the second operating mode.

Synchronization of an electronic device

An embodiment voltage converter includes a first transistor connected between a first node of the converter and a second node configured to receive a power supply voltage, a second transistor connected between the first node and a third node configured to receive a reference potential, a first circuit configured to control the first and second transistors, and a comparator including first and second inputs. The first input is configured to receive, during a first phase, a first voltage ramp and, during a second phase, a set point voltage. The second input is configured to receive, during the first phase, the set point voltage and, during the second phase, a second voltage ramp.

Voltage converter and method

In an embodiment, a device includes a switching power supply configured to have a first operating mode synchronized by a first clock signal generated by a clock generator a second asynchronous operating mode. The clock generator is configured such that the first clock signal becomes equal, upon transition from the second operating mode to the first operating mode, to the signal having the closest rising edge of a second clock signal and a third clock signal complementary to the second clock signal.

An embodiment electronic device includes a first circuit including first and second transistors series-coupled between a node of application of a power supply voltage and a node of application of a reference voltage, the first and second transistors being coupled to each other by a first node, and a second circuit, configured to compare a first voltage on the first node with first and second voltage thresholds.

Voltage comparator and method

An integrated circuit includes: a primary supply stage including a primary supply node, the primary supply stage being configured to deliver a primary supply voltage to the primary supply node; a secondary supply stage including a secondary supply node, the secondary supply stage being configured to deliver a secondary supply voltage to the secondary supply node; a supply-switching circuit; a pre-charging circuit controllably coupled to the secondary supply node via the supply-switching circuit; and a volatile memory circuit controllably coupled to the primary supply node and the secondary supply node via the supply-switching circuit, wherein the switching circuit is configured to connect a supply of the volatile memory circuit either to the primary supply node in a primary supply mode, or to the secondary supply node in a secondary supply mode.

Method for precharging an integrated-circuit supply, and corresponding integrated circuit

An electronic device includes a switched-mode power supply having a first operating phase during which the output node of the switched-mode power supply is coupled by an on switch to a source of a first reference voltage. The first operating phase is followed by a second operation phase during which the output node of the switched-mode power supply is in a high impedance state. While in the second operating phase, a capacitor connected to the output node of the switched-mode power supply at least partially discharges into a load.

Switched-mode power supply having multiple operating phases and a stepped reference voltage

The process for starting a power supply circuit which includes a switched-mode power supply is performed using: a first phase during which, if an output voltage of the switched-mode power supply is lower than a first voltage, the switched-mode power supply operates in pulse width modulation mode to increase its output voltage up to said first voltage; and when the output voltage has reached the first voltage, a second phase during which the switched-mode power supply operates in a bypass mode.

Growing community of inventors

Beaurecueil, France

Sebastien Ortet