Diodes Inc.

Joy Das

Dongjie Cheng

Vijay Hugar

Sumit Bhat

An apparatus includes a plurality of MOSFET device groups connected in parallel, wherein a first common node of the plurality of MOSFET device groups is coupled to a cathode of a light emitting diode channel of a plurality of light emitting diode channels, and a second common node of the plurality of MOSFET device groups is connected to ground, and a control circuit configured to generate gate drive signals for the plurality of MOSFET device groups, wherein the gate drive signals are configured to adjust a current flowing through the light emitting diode channel based on a predetermined color and a predetermined brightness level of the light emitting diode channel, and under different duty cycles, the control circuit is configured to control the current flowing through the light emitting diode channel to be proportional to a corresponding duty cycle.

LED color and brightness control apparatus and method

An apparatus includes a bandgap voltage reference configured to generate a current reference for controlling a plurality of light emitting diode channels, a plurality of MOSFET devices connected in parallel and coupled between a cathode of a light emitting diode channel and ground, wherein the plurality of MOSFET devices is configured to control a current flowing through the light emitting diode channel, and a control circuit configured to generate gate drive signals for the plurality of MOSFET devices, wherein the gate drive signals are configured to adjust the current flowing through the light emitting diode channel based on a predetermined color and a predetermined brightness level of the light emitting diode channel.

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Shyamnagar, India

Joy Das