WS2801 with high current LED

Other Hardware LEDs and Multiplexing
11

Hi Guys,

How did you go with this?

I am also working on a similar project but having some issues. I want to control some 12V LED strips using the WS2801 however I am unsure which schematic in the datasheet is suitable. I have got one of these chips working with a single RGB LED but want to expand a bit.

I normally control these strips with the Arduino PWM output via a transistor however I want to control 4 strips which exceeds the number of PWM outputs. I normally use the following setup with a N-channel MOSFETs such as the STP16NF06.

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I was going to use the "constant current with external switches" schematic as this makes sense to me. However, before I started soldering I thought I would try to work out what the difference between this and the "constant voltage with external switches" is???

Any help?

Thanks
Sam