Ok, for fun and enjoyment I have decided to build in chargers in a number of positions on the "Mom Van." But either I can't do math, or I am missing something. I want tablet style chargers capable of 2 amps, but when I do the math--basically I'm going to set the car on fire. I chose:
A to-220 5v rated to 2 amps https://www.mouser.com/datasheet/2/389/l78s-974158.pdf
And there will be heat sinks--currently thinking of these: https://www.mouser.com/datasheet/2/303/sink_csm-1265487.pdf
My problem is that with a voltage drop from 14.4 to 5 and at 2 amps I get (9.4v)(2A)=18.8Watts. Take the 50C/W rating from the data sheet and I get a temperature rise to air of: 50C(9.4)=940C.
I could buy these chargers for a couple bucks (but this is more fun, and I want them built in seamlessly)
I must be missing something? Any help would be appreciated!