Also, the graphs in the link do make sense. Look at the graph for the PTC 2650. The accompanying text states 5 ohm at 25 C, and tempco 4000 ppm / C. PPM stands for parts per million. That's 0.4 % per C. Now follow the graph from 25 C to 125 C. That's a change of 100 C. 100 X 0.4% is 40 %...
You linked in your second post to a page about positive tempco (PTC) thermistors. I'm not sure if you can even use the Steinhart-Hart equation for PTC. I know you can apply it to NTC thermistors. But you are better off not using the Steinhart-Hart anyway, unless you have to. On the other...
Check out:
http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=12297
http://gamma.octopart.com/Cincon__EC6C06%28ROHS%29.pdf
I think you could parallel two of them to get 2 amps. According to the datasheet you can trim the voltage 10%. That's enough so you can put schottkys on the...
In the configuration stated in your original post, with the ground on the left:
Under fet1, you have 400 amps flowing through the buss.
Under fet2, you have 300 amps.
under fet3: 200 amps
under fet4: 100 amps.
The heating (power) varies with the square of the current.
So the current through...
