Infineon Technologies Ag

Yoshinori Imanaka

Maurizio Galvano

Fabio Fragiacomo

Enrico Tonazzo

Davide Ghedin

Mattia Montoncelli

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

An expander circuit may be configured to control a plurality of driver circuits for driving light emitting diodes (LEDs). The expander circuit may comprise a bus interface circuit configured to receive control signals from a processor over a communication bus, and a plurality of modulation signal generators configured to generate modulation signals based on the control signals. The expander circuit may be configured to provide the modulation signals to the plurality of driver circuits for driving the LEDs.

Growing community of inventors

Yokohama, Japan

Yoshinori Imanaka