Thread: `NEW' Small DC-DC ATX Power Supply

Maybe on vacation or something. School is over!
I cannot wait to know also.

hey, sorry everyone for the lack of my presence in my own thread. i've been running back and forth from Washington DC for interviews and grad school ****. it's driving me nuts. Anyway, things have calmed down for the time being.

Here's the update:

TI has finally given me a date on the missing -5V regulator, they said that it will be shipped no later than 6/20/02 (i placed the order back in MAY!!)

I believe the -5V has been shipping and has made it to my friend at the labs and he'll solder that into the PSU and it'll be complete. once that's done, i have a hacked SV24 with a celeron 900, 128meg RAM, 1.2gig laptop hd and pioneer slot DVD drive running winME ready for him to bench. he'll test it on there and i'll be able to get some results on how the loads, currents, voltages, etc.. are

once i've gotten those measurements, it'll put me in a better position to judge how efficient this PSU is. also, it'll give me the opportunity to see if indeed it gets hot or not. Currently, no heatsinks or fans

then of course, i'll load it up with LCDs, palms and GPS antennas to see how much it'll take...etc

from there, pricing and final casing and stuff

once again, i apologize for the delay, it's TI's fault and their inability to manafacture their products fast enough j/k

-kaboom

I'll definately buy one of these from you if it can handle the load of a few extra add ons and still regulate voltage. Can't wait to see the results... good luck

what are the full specs of this PSU here anyway??
Voltage and amperage?


Just for comparison purposes, I wanna mention the hardware im running with Jeff's 70W PSU.

MBPS-1 70W ATX DC-DC

Shuttle FV-24
PIII 667mhz
512MB RAM PC133
SIIG dual serial PCI card
Pioneer 10X Slot DVD-ROM
30gig ATA100 7200rpm HD
CPU fan
USB- Studio PCTV( external TV/FM tuner)
PS/2 keyboard
PS/2 mouse
(5V) 20X4 char LCD
(5V) RandMcNally GPS

amazing what 70W can do.

The two high speed case fans i have in the case is using unregulated 12V (9-16V)

Computer never reset when im cranking too....a solid PSU Jeff.

Just a load of TI integrated switchers on a PCB... it will work, but I'd buy the parts and do it myself... Really isnt too much to hooking up these beasties.

And why is everyone putting their names down for one before they know if the even work yet?

Originally posted by Casper
And why is everyone putting their names down for one before they know if the even work yet?

Encouragement. We're interested.

Originally posted by C4M

Encouragement. We're interested.

Tack my name up with the interested. im just getting started with my car pc but I could allways get the power supply first

Well, met up with my friend today and found out that the power supply is all done!

Here's whats going on, the power rails and currents all meet the required specs once connected to a 12V source. I believe the current setup we had pulled about 4 AMPs and all the voltages were stable. There wasn't any heatsinks or fans that were required, it ran only slighty warm. I designed this PSU to draw no more than 10AMPs.

However, he's the problem we're encountering. I guess I don't understand the ATX motherboards too well, but what does the "Power Good" output suppose to do? Like I'm not understanding if there is a constant power requirement for the ATX motherboard inorder for this thing to power up and down. WE're in the middle of testing it and only was able to get the SV24 to boot once and we're not sure how that happened. We were playing around with teh power good signal something with a 5V. If anyone has some information to pass along this will greatly help in our troubleshooting. OTherwise everything looks good!

thanks for your patience

-pete

It goes logic high (5v) when the power is good. Some MB's you can get away with just connecting it to the 5v rail, others need the delay to work properly. Either use a logic chip and make a small delay or use one of the maxim chips that monitor power supply voltage.