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Home / I-Opener Areas / I-Opener Technical Stuff Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? Newer Datel DC-DC converters look good.

Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) vortex Profile Hi, I'm new here. Just got 4 I/O. For fun, no hard plans yet. Also got a K6-2+ 450 on ebay. I read the many discussions of the Q16 heat issue. Thread from ~year ago talks about DC-DC converters. I see that Datel now sells several very compact (.34x2x.54 in) DC-DC's 2v@10A online for ~$20 + shipping. I know a larger Datel was tried last year with some success. Anyone tried one of these smaller Datel DC-DC's ? Comments? See: http://www.datel.com DC-DC converters -> Single Output Non-isolated -> 2Volt output Best Regards, Vortex 07-29-2002 23:03:11

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) gr8_brit Profile Yep, it works. I have a 450 K62P running quite happily using the USN-1.8/10-D5 (1.8V 10A out 5v IN). IT DOESN'T EVEN GET WARM! Great thing about these is the Trim input. From memory you can go about +/- 10% on the output with only a single resistor. (I went up to 1.95V for mine.) Also, it fits just above the plastic mount for the SODIMM and below the metal shield. Using some heavyish gauge wire to hold the thing steady, it was a real easy mod. I'd recommend them! Save's all the messing with extra heat paths for that Q16 and cooling (sic!) resistor mod stuff. Also, get the newest Badflash Bios. It now boots my K62P with a 100Mhz bus and 4.5 multiplier. WHOOHOO!! Win2K Server works pretty well (thank goodness for ntswitch!) Go for it!! Cheers, gr8_brit 07-30-2002 11:42:25

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) vortex Profile Great! Can you please post how you did your setup. Did you use any extra Caps on the input or output? Where did you attach the On/Off control line? Ground? Any particular reason that you went for the 5V vs the 3.3V unit? Thanks and Regards, vortex 07-30-2002 12:57:03

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) gr8_brit Profile I'm going to have to pull this thing apart and use my crappy web cam, but here goes with what I can ....... Must also correct my previous post... it was a USN 1.8/10-D5R (has a sense line). Datel pdf data sheet here Here's the whole mod to my machine ... Removed Q16. Took the Ground (0V) connection to the Datel DC-DC converter from the big sqare mounting pad to the left of Q16/cap combo point. ground point from here - black wire to DC-DC pin 6 Connected output from DC-DC to the lower left pad of Q16. red wire to DC-DC pins 1 and 2 Then took +5V from the top pin of RV2, just above the USB port. yellow wire to DC-DC pin 8 Trimmed the DC-DC UP to 1.95V by pulling the trim line (pin 10) DOWN to GND (pin 6) with about 16K (used two 33K's in // ) Also connected the Sense output of the DC-DC (pin 3) to the extra output line (pin 4). The On/off line (pin 11) was left alone (it's internally pulled high). Also cut off pin 5 to save any OOPS with GND to +V Out shorts. Why did I use the 5V in part? coz it's all that Datel had at the time, plus the use of 3.3V in means you're regulating from an allready regulated supply (and I know that's also true of the +5V rail, but it's more likely to have more 'grunt' than using the 3.3 rail). As you can also see it sits on top of the plastic SODIMM socket, and then wedges between the metal shielding when the whole thing is put back together. I also used pretty stiff single core wire which also helps stabilize it all too. Seems to work good for me! Cheers, gr8_brit 08-02-2002 12:50:18

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile Well, I picked up the LSN-2/10-D5 from datel, and slapped it into my iO in the same way gr8_brit did. I checked the voltage, and its 1.999V (pretty darn close to the 2V spec). Course, now my iO won't boot. I'm pretty sure its because I am using a K6III+, which requires 2.2V vCore. I will have to trim the converter up the +10% to 2.2V and hopefully have my unit back up. It was working fine before using the identical setup, but with the power resistor hanging off of Q16 08-08-2002 11:00:49

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile Well, throwing in a 4.7k resistor seemed to do the trick. The iO boots now (yay!) with the output of the datel at 2.2V instead of the 1.999V as before. Unfortunately, I can only seem to crank my processor up to 350MHz before the iO freezes. at 400, it will lock up in about 2 minutes or less. My processor is a 450, so its kinda dissapointing to see these kind of results. If anyone has ideas as to why this might be the case, please shed some light on the issue. 08-10-2002 23:25:14

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) gr8_brit Profile Do you have the newer Badflash Bios (5.4 something)... Mine had the same problem 'til I got ahold of this modified version. I think it has full support for the K62+ processor. The only way I could get the old version to work was to use WPCUID to tweak the clock multiplier after it had booted (in slow mode). Also, what are your bus speed and clock multiplier settings... before using the new Badflash Bios I couldn't get 100Mhz bus speed to run reliably either. Cheers, gr8_brit 08-12-2002 09:42:38

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile I can't remember if I am running a hacked bios or not. Its a V4 with the yamaha audio. I was running a V5 with a badflash bios, but I traded it with a guy for his V4. In any event, I updated my bios to V5.40 off of wild_pencil's yahoo briefcase. not sure what the difference is between that and 5.40a. In any event, same results as before. I crank it to 4.5 multiplier, and a few seconds later i hear a click from the hard drive, and the backlight kinda flashes. It does that once or twice more, then locks up. My voltage is currently 2.24V according to hardware sensors monitor pro 2.2. I am running a K6 III+ 450 according to the latest WCPUID (3.0g). 08-12-2002 16:51:17

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) *SF* Profile I would suggest reading this Thread Alternative program to set AMD K6-2/III+ Multiplier It refers to Boot Speed......near as I can Tell. I would Guess your Problem could be Power Related ??? (A Larger Amperage 19V Power Supply might Help ?) 08-12-2002 19:47:22

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) Rezz Profile | Email damagi I believe the differences' are defined in the disclaimer on the home page for linux-hacker.net. That being, K6 support is not included in the public version (V5.40) that wild pencil posted in his briefcase. 08-12-2002 22:36:38

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile Rezz: thanks for the heads up on that...its been so long since the linux-hacker.net main site was updated, that I haven't checked it in over a year. *SF*: I have been booting at 3x100, and using k6clkwin to adjust the clock speed. At 300 and 350, it runs for hours on end, no problem. At 400 it locks in about 2-3 minutes, and at 450 it locks in about 30 seconds or so. I have all the standard mods used with the dropping resistor mod (extra resistor at R302). My unit has all the dip switches installed, so i can set the multiplier to whatever. Any ideas on where to find a 19V power supply thats rated higher? 08-12-2002 23:03:22

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) *SF* Profile Rezz, Thanks, that was what I was Searching For, But couldn't Find. damagi, EBay ? If Power is Your Problem. I would think You would see a Voltage Drop as You went faster, You might want to take a few readings @ different speeds. Another thought is Heat. See If You get any Longer Run Time, If You sit it in front of an A/C, blowing Cold air on it. 08-12-2002 23:57:16

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) gr8_brit Profile Guys... Invest the 21 bucks in the Badflash Bios. TRUST ME!!! I couldn't get Wild Pencils BIOS to work properly with the K6 at faster rates.... YOU HAVE TO GET THE BADFLASH VERSION. My machine has a K62P450, internal 10Gb drive, lasagna fan, external keyboard mouse and USB ethernet. The Stock PSU is good. Don't waste money on something that's not needed... GET THE NEWER BADFLASH BIOS!!!!! I had that same problems ... why do you think I keep saying get the NEWER K6 supported bios!!! IT WORKS!! Cheers, gr8_brit 08-13-2002 07:57:07

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile Flashed with 5.40a. Bios now recognizes chip properly. Same results as before. I guess my two options at this point are to try adjusting the trim to get the voltage closer to 2.1V (like 2.15V or so), and/or start checking voltages/loads to see if i am hitting the current limits of the power supply. 08-13-2002 16:46:39

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile So if i were to replace the power supply, do you think that 2.64A would be good enough, or would I need 3.42A? The current supply has 1.84A, which I could easily see as being a bit low. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2045900450 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2046250086 that is what i was thinking of one of those as the replacement supply. thoughts? 08-14-2002 14:52:01

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile I tried a Compaq PS from a PC recycling place locally, and I ended up with the same results. This unit is rated as 18.5V and 2.5A. My only doubt in it is that it is rated at 35W, which implies that it runs 1.89A at 18.5V, and the full 2.5A at 14V and below...I suppose I will go back and try a different one. 08-15-2002 21:22:43

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) damagi Profile ok, using a dell PS rated at 18V, 2.6A (~45W), and I changed the trim resistor to get the voltage down to 2.19V according to hardware sensors monitor pro (~2.15V according to my multimeter). Cranked up to 4.5 multiplier and had similar results to before. I have the R302 resistor added for over-current issues, and I am running the 5.40a wild pencil bios (booting at 300MHz). 2.086V - Won't boot, black screen, hard drive spins up, then stops 2.149V - Boots, runs fine at 300 & 350MHz. 400MHz seems to be ok...guess i will have to settle with that. 450 was a no-go. any ideas? im hitting the limits of my experience. according to the datasheets from AMD, a K6-III should run at 2.1-2.3V and a K6-III+ should run at 1.9V-2.1V. 09-20-2002 14:52:15

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) BadFlash Profile | Email Finally got enough time to do the LSN-2.0/10-D5 mod on an old V3. This little gizmo is a 10 amp 2volt switching power supply sold by Datel for around $20. Only 3 connections to the motherboard and the heat problems with putting in a K62+ or K6III+ are over. I’m running a K6III+ at 500 Mhz and the CPU temps are around 105 with 70 degrees ambient temps. No board heat at all, around 75 degrees. The Datel is cool to the touch after 20 minutes of operation. I mounted mine on top of the modem. No jumper is needed for R302. The connection goes from the +5V hook at the empty trace at the top of RV2 just under the lower right corner of the modem. This connects to pins 7 & 8 on the Datel. Next ground goes to pins 5 & 6. I went to the ground pad just to the left of Q16 just above the left side of the SODIMM socket. Next remove Q16. Desolder both pins and bend them up so that the board is not damaged. Next, using a high wattage iron (+40w) heat the tab on Q16 and remove. Alternately you can just desolder the leg closest to the SODIMM and break it off. The goal is to get access to the small solder pad closest to the SODIMM, not the big one where the tab on Q16 was attached. The big pad is the 3.3V input, the small page closest to the sodimm is Vcore. Vcore is what you want. Now run a wire (this needs to handle 10 amps) from the Vcore point and connect to pins 1,2,3 and 4 on the datel. Figure out a way to mount it. I used electrical tape. The wires will hold it pretty much. If you have a V1, V2 or V3A you will need to split the CPU voltage. This is done by moving R60 and R61 from the top of the CPU socket to R184 and R184 on the right side of the CPU. All that is left is to solder on the FSB and CPU multiplier dips and you are good to go. The only downside I see to this is the cost, and if you have a V1 or V2, this is really the only viable option. 07-21-2003 15:45:04

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) Rezz Profile | Email Badflash When you ran the 20 minute temperature test were you running some sort of Heavy Load Simulator or just letting the machine idle? 07-22-2003 12:59:25

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) BadFlash Profile | Email Nothing really heavy duty, but not idle. I was doing continuous video playback with windows media player. 10 amps is plenty of juice for 500Mhz. 07-25-2003 18:39:39

RE:Newer, Smaller, Cheaper Datel DC-DC converter. Suitable? (modified 0 times) JaxDomino Profile Thanks BadFlash for pointing me here. The CPU upgrade will be great!!!! 09-20-2003 06:58:29

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