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MSPLife

current limit for RGB LED

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Hi everyone,

I read this thread: http://forum.43oh.com/topic/2680-group-buy-10-o-rgb-smd-led-with-built-in-controller/

I wondered that where is resistors for current limit (5050 RGB LEDs) in this project, can you help to explain.

Thank you!

 

These LEDs are not typical 5050 RGB LEDs, they contain a specialized driver IC inside.

The IC has internal circuitry which allows it to drive the LEDs using a constant current rather than a constant voltage.

 

LEDs are constant current devices by nature, however it is often easier to drive them using a constant voltage hence the need to use current limiting resistors.

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