1) single color LED2) RGB LEDs
c)LED order (RGBRGBRGB, or RRRGGGBBB)
1) Voltage limited (resistored)2) Current limited (LED driver)
1) current sink2) current source
I would like to know more about LED driver chips,
I assumed current source meant that the chips controls + voltage, and current sink meant controls the ground,
Asking a lot here for a forum answer, it is more like a chapter of a book you need.Quote1) single color LED2) RGB LEDsAn RGB LED is just 3 LEDs, nothing special. Some (not all) have one connection common.Quotec)LED order (RGBRGBRGB, or RRRGGGBBB)? - just depends on how you wire them up.Quote1) Voltage limited (resistored)2) Current limited (LED driver)No. 1) is not voltage limited, they are both current limited. Both attempt to produce a constant current in the LED. An active constant current output is what some, but not all, LED drivers have. Most that have constant current use a pull down constant current control because it is a lot cheaper to do this. This is what you call a common anode driver.Quote1) current sink2) current sourceMost drivers, even the ones that are not constant current use a current sink, again because it is easier / cheaper to do this. I know beginners don't like current sink but just get over it.QuoteI would like to know more about LED driver chips, So down load the data sheets and read all about them. There are many more than you mentioned. Go to a major distributor like Farnell, search on LED drivers and pick the ones you want to look at. The data sheet is available on line from them.QuoteI assumed current source meant that the chips controls + voltage, and current sink meant controls the ground,Yes if you want to think of it that way it will do as a working definition.The MAX7219 also controls the multiplexing of a matrix in a way that many drivers do not.
How would you group the driver chips?
Are there chips that source, but wont sink?
I also think that multiplexing is more of a feature, than a requirement
I was looking at the max 72xx chips, and It appears that they are not suitable for RGB, since they can only set one voltage output, and RGB LEDs need 2 or 3 voltages.
I've also found that there are a LOT of LED drivers made by many different companies,