Texas Instruments Corporation

Philippe Perney

Pierre Michel Carbou

Paolo Giovanni Cusinato

Lorenzo Indiani

Jean-Christophe Jiguet

Pascal Guignon

Francois Bauduin

Frederic Ballin

Gwenaelle Merrien

At least some embodiments include a LED driver system. The system includes multiple branches of series-coupled LEDs, multiple current sources, and control logic. Each of the current sources is coupled to a separate branch of series-coupled LEDs. The control logic is coupled to the current sources, and is configured to regulate current through each branch based at least in part on a feedback voltage measured at a node in one of the branches.

Systems and methods for driving light-emitting diodes

A power management bus for controlling power over multiple device subsystems includes a master power bus controller which transmits power management information to control one or more power resources through a transmit interface. The transmitted information is received at one or more receive interfaces. A broadcast message can be transmitted to control multiple power resources by subsystem, resource group and resource type. A single address message can be transmitted to control a single power resource. A power down can be initiated at any of the receive interfaces.

Distributed power management

The present disclosure describes systems and methods for driving light emitting diodes (LEDs). At least some embodiments include an LED driver system that includes a power supply, a plurality of current sources (each current source coupled between a common return resistor and one of a plurality of branches of series coupled LEDs, and each branch coupled between a corresponding current source and the power supply), and control logic coupled to the current sources (the control logic capable of controlling the current flow through each current source). Each of the current sources allows current to flow during one of a plurality of substantially non-overlapping time periods within a repeating time interval, each current source allowing current to flow during a different time period. The magnitude of the current flowing through each current source is substantially the same and is regulated based upon a feedback voltage across the common return resistor.

Unbalanced plural string LED driver with common return resistor

Delay circuit comprising a delay cell formed by a current source (I) connected between drain and source of two field-effect transistors (PO, NO) whose gates are connected to each other in order to constitute the input of the cell, and an inverter (INV) linked to one or other of the terminals of the current source (I) according to whether the delay is to affect the leading edge or the trailing edge of the signal to be delayed, a capacitor (C) for defining a delay time (Te) proportional to the power supply voltage and inversely proportional to the current (I) delivered by the current source, being connected between the input of the inverter (INV) and earth, characterized in that it furthermore comprises a circuit (Ci, Cu, S1, S3, AMPLO, P1) for regulating the current delivered by the current source in order to make it proportional to the power supply voltage of the circuit.

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Cagnes sur Mer, France

Philippe Perney