Ok...weekend is over(i need weekend) - now i have to do PROGRESS
I just made some decisions with my collegue who works with me on this project.
First of all i'd like to thank you two very much for your support!
We will do the "small version" with normal leds - we will face some other problems when it comes to etching for sure, so time is an expensive factor.
We will build it modular - so we can extend the actual controllerboard with a "driverboard" which contains the small solution of powering the 3W led by MOSFET and resistor.
The circuit design must be Pin (2.54) compatible. We can use our parts even if etching fails (which is quite hard when we work with smd).
And there is another question (yeah im not annoying
The posted MOSFET is smd - due to our decision it won't make it to the basket. I found another one which seems to be similar for me http://www.farnell.com/datasheets/14454.pdf
- one thing i noticed: the GS threshold voltage is -2 to -4 on the recommended RTR030P02 (second link, previous post) it is -0.7 to -2. Will this work out with my -5V? I read that the on resistance is 0.32 ohm - do i need to subtract the volts i lose in the mosfet?
In the attachment i painted how i'd wire it. Please ignore the calculation - the correct one is: ((5V - 0.32ohm*350mA)-Urgb)/350mA = Rrgb
Thanks a lot!!!