I'm trying to create a dimmable/ switchable 12v LED strip using an Arduino board and a MOSFET. Many tutorials can be found doing so such as this youtube link.
I've bought a LM317T before I had any substantial knowledge regarding MOSFETs. Trying to understand using some tutorials ( each one used different MOSFET ) made it partialy clear what parameters to look for in such project mainly using this link, but some left in the dark - and this is the reason for this post ( and to understand why my MOSFET is not suitable ).
I'll compare with one suggested, FDC855N
1) It has to be "Logic Level" MOSFET, meaning Vgs has to be 5v: from what I understand, 0v at the gate you get 0v at the drain and at 5v at the gate you get maximum Vsource. it is correct ?
1a) FDC855N Vgs's value is +/- 20v, how is it Logic Level ? will Vdrain @Vgs=5v will be different when @Vgs=17v ?
1b) Why in FDC855N Vgs have 2 values when Rds(on) is noted? one is 10V and other is 4.5v ?
2) Vgs(th) stands for minimal voltage needed for current flow at to drain. it is correct ?
2a) why is it noted as @Vgs=Vds ?
3) why Rds(on) is important for ? only for power dissipation purposes ?
I'll be glad to have answers for those question in comparison to the 317T MOSFET, since 317T datasheet has a different terminology :(
Appreciate any help, Guy