Greetings all, I had a little PCB made which just did some PWM via a 10k Pot. I picked somethign easy because I just wanted to familizarize myself with using the arduino and then using the arduino as a programmer as I had programmed an ATTINY85 do do the PWM.
Afte rhaving the board made and sent to me it works! I'm totally into this! But the MOSFET (220 package) is pretty "tall" on the PCB and intereferes a little with turning the pot knob. So I went looking around and found this MOSFET that is in a DIP4 package ( http://www.digikey.com/product-detail/en/IRLD024PBF/IRLD024PBF-ND/812492
So it SEEMS like it should work fine for my purposes: logic level gate, can handle 2.5 amps (I am using a regulated 5v supply in and my LEDs draw .8amps when turned "on" all the way). But I'm concerned about the fact that the MOSFET's data sheet says it can only handle "1.3Watts" as its "Max power dissapation." The other MOSFET says it can dissapate 75W! The "RDS" (which I thought was what you used as the "resistance" in any calculation on a MOSFET) is listed as 0.1 Ohm at 5v.
I tried to read some posts about how to calculate if this MOSFET can handle it and I came up with 0.1Watts which doesn't seem right and then a guy at work said he thought I needed 5Watts dissipation.
So I'm coming here to see if someone can tell me exactly what I need to find on a data sheet so I don't melt anything
Again, my project has 5v regulated coming in, passing through the MOSFET (which is being triggered on the gate by the ATTINY85), and then out to the LEDs which draw about 0.8amps when fully on. These LEDs are in a piece of furniture so it's possible that they would be on full power "all the time" for days on end.
Thanks in advance if anyone can help me understand this because I'm really enjoying this and feel like I'm come so far and then BAM, brick walled because I don't understand this little piece.