its useful as hell and i am workin on a cp i just dont have the power to sticky lol, i do have a question tho, can i run the cube from 7.2v through the original power board and run a seperate supply for 12v like a smal batt pack or wil that not work
Yes. According to their datasheet, the two dual output LM2643MTD regulators on the 'cube's PSU can be powered off of as little as 4.5v.
...Actually, that's the datasheet for the LM2645
MTD. I think they're very similar... but I could be wrong. I can't find ANYTHING on the LM2643MTD.
This thread sucks....why should we sticky it
, I'm kidding, of course
. Sorry, adding it to the thread now...
Cool, thanks man.
It feels so nice having TWO threads stickied.
I'm actually starting to feel important around here now... do you guys think I'm important...?
I'd like to point out something very important...
You might look at the 1.9v line and think "Wow that's a ton of current" but it's not really.
2000mA @ 1.9v does NOT equal say 2000mA @ 7.2v.
The solution to finding total power draw is to multiply current x voltage to get power, or wattage.
1.9 x 2100mA = 4 W
3.3 x 800mA = 2.6 W
5 x 350mA = 1.7 W
12 x 5mA = 0.5 W
Add these together... you get 8.8 W
To get current, divide this by your battery voltage. Using a DVD player battery with Li-poly cells, 8.8W / 7.4v = 1.19 amps. (or 1190 mA)
This might not make sense. It seems kind of low actually, but there's lots of room for error. Remember that this amount is at peak effiency (using several voltage regulators will decrease efficiency, drawing more current)
edit: if all the regulators are at a hopeful 80% effiency (expect less frmo a linear regulator) then the total draw is upped to nearly 1500mA.
I am SO stupid... I... never really thought about that... wow... so, what you're saying is... two 10,000mAh poly li-ions from batteryspace (what I was planning on getting for my GC laptop) is probably COMPLETE overkill then...?
Especially considering the fact that I won't be using the disk drive (CF card hack all the way, baby!)...
P.S. Oh, and Marshall... since you're here and seem to know... well, stuff... as you usually do, do you think the 'cubes 1.9V line would do okay on 1.8V? Or don't you think I should risk it, since it's a sensitive (CPU) voltage? It's just that I'm trying to build my own, ultra-efficient all-in-one PSU for my laptop, and my screen uses 1.8
V, 3.3V, and 5V, so I'd like to avoid a separate line that's only .1V higher.
Plus, 1.8V regs are more common.