Infineon Technologies Ag

Mattia Montoncelli

Maurizio Galvano

Enrico Tonazzo

Christos Konstantopoulos

Roberto Penzo

Yoshinori Imanaka

Federico Cusinato

In some examples, this disclosure describes a method of operating a circuit for delivering current to a plurality of light emitting diodes (LEDs) arranged in series. The method may comprise delivering a first current to the plurality of LEDs through the first LED pin and over a first current path through the circuit; delivering a second current to the subset of the plurality of LEDs through the second LED pin and over a second current path through the circuit; and regulating a sum of the first current and the second current, wherein the second current path is in parallel with the first current path in the circuit, and wherein the sum of the first current and the second current is regulated based on a sensed current through the circuit.

Light emitting diode (LED) current regulator circuit with multiple LED pins for robust control of LED chain

Regulator circuitry configured to manage power supply ripple using an adaptive loop gain that offers ripple rejection performance related to the ripple magnitude for a negative closed loop of the regulator circuitry. The power supply regulator circuitry of this disclosure includes an error amplifier in the closed loop and an adaptive loop gain circuitry. The adaptive loop gain circuit removes a DC component of the sensed output and feeds the sensed output, including the output ripple, to peak detector circuitry to obtain a Vpeak signal. The Vpeak signal output from the peak detector circuitry is a continuous signal that tracks the wave peak. The circuit arrangement multiplies the output of the error amplifier by the signal Vpeak resulting in improved power supply ripple rejection as the ripple amplitude increases. To avoid control signal with zero value during times that the peak-to-peak value of the sensed voltage.

Adaptive loop technique for high PSRR current regulator

A circuit may be configured to deliver current to one or more light emitting diodes (LEDs). The circuit may comprise a first current path configured to deliver a first current to the one or more LEDs, and a second current path in parallel with the first current path, wherein the second current path is configured to deliver a second current through a voltage drop element and to the one or more LEDs. According to this disclosure, a sum of the first current and the second current is regulated based on a sensed current through the circuit.

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Abano Terme, Italy

Mattia Montoncelli