Thread: Correct PSU Selected - Commell LV675D ???

The reason I asked the above question is that the builder is trying to promote a different PSU. He believes that the PW-200-M will be all that I need.

12V Micro Power Supply
- 200 Watt DC-DC ATX power supply (PSU)
- Over 95% efficiency, ultra compact
- 12V input
- 100% silent, fanless
- Plugs directly into the moterboard ATX connector
- ROHS compliant version (limited qty, EU customers first)

It doesn't appear to have any soft start or smart features at all and touts as being small and eliminates a number of cables by being able to be plugged directly in. Something tells me for my own peace of mind that I should still go with the M2-ATX with all of it's features. I've roughly determined that the power requirements for the MB, processor, and HD can be between 70 to 90 watts, then add the approximately 15 watts from the TS and the the minimal requirements of the WIFI, AM/FM and GPS and I believe I'm still well below the wattage rating of the M2-ATX.
On top of that, the PW-200-M would still need some auto start-up / shut-down and control features for the rest of the system. The items listed in the mp3car store look nice but I know nothing about them, nor do I see any declaration of these items in anyone's signatures (unless they're not considered worthwhile mention).
Micro Shutdown Controller


or the CarPC EZ v2.5d Simple ATX Power Controller


or the CarPC EZ v2.5d Advanced ATX Power Controller


Your thoughts??

Avoid the PW200M like the plague.
It does not regulate the 12v line, so it passes unregulated power from the battery to the motherboard, ptentially damaging your components.

Read this thread for more information: FAQ: Will <insert PSU model> Power Supply work with my system?

Originally Posted by DarquePervert

Avoid the PW200M like the plague.
It does not regulate the 12v line, so it passes unregulated power from the battery to the motherboard, ptentially damaging your components.
Read this thread for more information: FAQ: Will <insert PSU model> Power Supply work with my system?

Thanks DP. I don't know how many times I already went through that thread. It still leaves me in a bit of a quaundry.

Mini-Box M2-ATX
12v rail = 8A (96w)
3.3v rail = 8A (26.4w)
5v rail = 8A (40w)

If there's only 96 watts available at 12V and the TS display will require approximately 16 watts, I'm not sure what the usual 12V wattage requirements are of the usb GPS, AM/FM and WIFI. Do they draw upon the 12V supply as well? The big kicker is that I've searched hi and low from the Commell site and can't seen to find the 12V power requirements for the motherboard. The unit will be using a 2.5" 1.6 Ghz processor so there must be a standard power requiremnet for that - but is it still a 12V requirement? As well, the 100Gb HD - does it rely on 12V power or a different voltage?
Will the M2-ATX meet my needs when all is said and done? And if not quite enough, should I look at supplying the transflective display with 12V power from the cigarette lighter (the cig lighter itself will be removed anyway)? The Lilliput 629 (Transflective) has it's own power On/Off switch anyway, so it will always need to be turned on regardless if it was connected to the M2-ATX or not. Should it not be safe enough to run it to the cig lighter feed if the PSU is close to being tapped out. There's quite a price jump to the next level PSU, or so I've noticed.
BTW, DP, thanks for the warning on the PW-200-M PSU, I'll steer clear of that completely.


http://www.commell.com.tw/Product/SB...#Specification
http://www.commell.com.tw/Support/SB...75(S).htm#BIOS

USB will use the 5V line, so assuming your GPS is connected to USB, it is on the 5V line as well.

Have you considered how, exactly, you are going to connect your TS to the 12V line of the PSU?

Thanks to the link from DP - http://users.erols.com/chare/elec.htm It appears the the most power that could ever be drawn from the LV675D MB is 27 watts. Did I read that chart correctly and I'm assuming that's 27 watts from a 12V supply based on the highest processor speed / most demanding processor available to be installed on that MB - correct?
So that would leave me with;
MB - 27 watts (12 volt?)
TS - 16 watts (12 volt)
2.5" 100 Gb HD - ? watts (? volt)
USB WIFI - ? watts (? volt)
BU 353 - ? watts (? volt)
USB AM/FM - ? watts (? volt)
USB DVD/CD-RW - ? watts (? volt)

Am I getting this right?

Originally Posted by Uther

USB will use the 5V line, so assuming your GPS is connected to USB, it is on the 5V line as well.

Excellent, thanks Uther!! I take it that's all USB's for the most part or at least the ones I've mentioned are 5V? Is there a rough/average wattage requirement figure attached to these 5V USB ancilliaries?
This means that I should be OK with the 12V wattage requirements?

Originally Posted by Uther

Have you considered how, exactly, you are going to connect your TS to the 12V line of the PSU?

Exactly how??? Not really. Haven't got that far yet. I was assuming to cut the end of the cigarette lighter adapter off and connect that. BUT!!!, on the Lillyput (Transflective) display there's the 14 pin SKS Jack that has (2 aux vid inputs, 1 aux audio input - all 3 are RCA's), a 9 pin mini din connector, AND, another 12V feed line. That 9 pin mini din cable terminates into a VGA adapter and a USB adapter. Now comes the tough part. Do I still need to supply power to that 12V plug of the SKS Jack? My thinking is that it's no. That there will be power supplied via the USB and the 9 pin mini din. My thoughts are is that that 12V plug that's part of the SKS Jack is only needed if I run an aux 1 or 2 feed in through those 2 RCA's provided and where it won't be processed by the CPU. Am I on track with that interpretation?

Each USB device will draw different current, so it's tough to say exactly how many watts you will need. Most of the PSUs I have researched though seem to have enough watts on the 5V to power at least for USB items on average though, assuming you are running a low power VIA chipset. I'm not sure what happens to this number if you are running an intel or AMD based configuration.

As for the TS, I'm not sure about that model. I know the basic lilliput requires a separate power feed; the USB connector is only for the touchpad overlay and does not power the screen itself.

I run my LV-671 off an M-2 with a celeron 2.4 and I run my screen, GPS, 2 USB hubs slot load DVD, and 3.5 HDD with zero problems. You made a good choice!

Originally Posted by fixerofallthing

I run my LV-671 off an M-2 with a celeron 2.4 and I run my screen, GPS, 2 USB hubs slot load DVD, and 3.5 HDD with zero problems. You made a good choice!

Hey, thanks Fixer. It appears that your system would put even a stronger draw on power requirements than mine so I must be in a safe envelope. Many thanks for that, cheers.


John