Regulated 12 volt to 5 volt conversion - Howto?

**psyclobe** · 11-25-2003, 03:04 AM

Guess I might be blasted for not searching, but the search engine here is kinda picky and I wasn't having any luck.

So I have this 12 volt regulated power of 70watts. Its a dc to dc convertor from mini-itx.com. I was thinking about mounting this in the front of the car and having it power any misc perhipials I plan to mount up there, while in the rear of the car mounting the opus 150watts. So I have this slimline cd/dvd in a case which outputs to firewire, and it is requesting 5 volt dc. I bet theres an easy way to get 5 volts from a 12 volt supply, but I don't know where to look other then here.

If you have any good reading, please point me to it.

Thanks,
-Jason

**PTCruiser** · 11-25-2003, 03:46 AM

you don't need 12V regulated to produce 5V regulated...

How much amperage do you need?

With low amperage use a linear low drop out.
With higher amperage use a DC-DC 12V->5V

**psyclobe** · 11-29-2003, 02:07 AM

I'm looking for a 5v @ 2.5 amps

**Rob Withey** · 11-29-2003, 06:22 AM

PT6625: http://focus.ti.com/docs/prod/folders/print/pt6625.html

Small, efficient, easy to use. It's what I use to power my computer (along with a PT5071 for the 12V).

Rob

**PASware** · 11-29-2003, 08:27 AM

the pt6625 is out of stock.
You could use the
78HT305
78ST305
PT6302
PT6322
PT6653
All from TI

**DodgeCummins** · 11-29-2003, 09:18 AM

Why not run the 5v from your Opus in the trunk.

**psyclobe** · 11-29-2003, 02:16 PM

I'm now using the atx 5v lead to power the external cdrom and its working like a champ

Thanks,
-Jason

**afreeland** · 04-21-2010, 06:24 PM

Here is how to properly wire a voltage regulator using the LM7805 voltage regulator...Its a step by step tutorial...Voltage Regulator Tutorial

-afreeland