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US 9,883,554 B2Granted
Commutation circuit for sequential linear LED drivers
AssigneeMicrochip Technology Incorporated
InventorScott Lynch
Life of this patent
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Abstract
A sequential linear LED driver circuit is provided. The sequential linear LED driver circuit may include a plurality of current sinks, wherein each of the plurality of current sinks is configured to be coupled to a segment of a string of light-emitting diodes (LEDs), and a voltage divider that generates a plurality of reference voltages, wherein each of the plurality of reference voltages is applied to a respective current sink of the plurality of current sinks. The output of each current sink of the plurality of current sinks may be connected at a summing node.
Claims7
A sequential linear LED driver circuit, comprising:
- a plurality of current sinks, wherein each of the plurality of current sinks is configured to be coupled to a light-emitting diode (LED) string or a tap located within said LED string;
- and
- a voltage divider that generates a plurality of reference voltages, wherein each of the plurality of reference voltages is applied to a respective current sink of the plurality of current sinks;
- wherein an output of each current sink of the plurality of current sinks are connected at a summing node;
- wherein each current sink comprises:
- a control amplifier having a reference terminal and a feedback terminal;
- and
- a field effect transistor (FET) having a gate terminal, a source terminal, and a drain terminal;
- wherein the reference terminal of each control amplifier is connected to a first reference voltage;
- and
- wherein the feedback terminal of each control amplifier is connected to one of the plurality of reference voltages.
8 more elements
Dependencies are inferred from the claim text.