Looking for a very specific power supply  - Page 1
Forum section: electronics / general

author: codered11343
author_rank: Newbie
timestamp: February 15, 2015, 03:45:36 am
content: Hi.I have been looking for a power supply for a project that I might be doing to help out a local business. All or most of the components I need I have found easily...except one, the power supply. I have linked in the data sheet to the board that I need to power, but I have not been able to find a power supply that meets the chip and my requirements.The input voltage need to be min. 3.2v and max 4.3v with a typical at 3.7v DC. And current need to be min. 1.5 amps and max 12 amps with the typical current being 6 amps. I would like to find something that is as close to the typical 3.7v DC as possible but the higher the current output the better since I am planning on powering at least 4 of these from one power supply.I first looked into a normal PC power supply (300w) but all that I saw is that they have a 3.3v and 5v supply. Not going to cut it.I would prefer to just buy a power supply that will work for this, but if I have to I am willing to try and make my own if someone has and thoughts on how to do that or would it be easiest to try and just step down the 5v from a normal power supply?Any advice and guidance on this would be much appreciated.Link to data sheet.http://www.evolvapor.com/datasheet/dna30.pdf

author: rob77
author_rank: Super Contributor
timestamp: February 15, 2015, 09:57:20 am
content: buy a 3.3V 15A powerbrick with adjustable output. those are usually adjustable +-10%, so you should be able to tweak it to 3.6 (or even 3.7V).there are many manufacturers producing such supplies - one of them is Meanwellhere's a link to the 75W bricks they're manufacturing:http://www.meanwell.com/webapp/product/search.aspx?prod=rs-75the RS-75-3.3 is exactly what you're searching for.p.s. i'm not related to meanwell in any way, i'm just using their products.

author: Yago
author_rank: Frequent Contributor
timestamp: February 15, 2015, 10:39:57 am
content: Just to point out to members here.This is for a "vaping" device, IDK what that means to you but to me... a 12 Amp device in the users mouth with a first go DIYer PSU too.I'm out of this thread, safer dealing with the over unity bunch IMVHO.

author: codered11343
author_rank: Newbie
timestamp: February 15, 2015, 12:11:10 pm
content: Quote from: rob77 on February 15, 2015, 09:57:20 amInteresting. I will look in to that. Would tweaking the voltage higher effect the reliably/ lifespan too much?Also, I just found this.http://www.amazon.com/Module-4V-38V-1-25V-36V-Voltmeter-Adjustable/dp/B00IZ83BQYIt might work for what I need it for.And since someone seems to be judging what this is for. Its a "base station" for a electronic cigarette (Vaping) shop near me that they asked me to look into maybe making a prototype for them as a alternative to a hookah and some other commercially available units with much less control. I'm not hiding what it is to be used for, but it its use isn't necessary to my power supply problem.

author: Maxlor
author_rank: Frequent Contributor
timestamp: February 15, 2015, 12:47:20 pm
content: Quote from: codered11343 on February 15, 2015, 12:11:10 pmYago wasn't judging, he was pointing out that having a device in your mouth that's connected to mains warrants some extra safety precautions, not just using an off the shelf PSU.

author: PeterFW
author_rank: Frequent Contributor
timestamp: February 15, 2015, 03:31:13 pm
content: Hello!Take a PTH08T220 Texas Instruments DCDC converter module.15 Amps at 1-5.5V without anny problem with a input voltage from 7.5 to 14VWhen only used to "heat" something the in and output capacitors do not have to meet the requirements specified in the datasheet.The Voltage is adjustable with:A DAC output fed into the feedback network.A simple potentiometer.A digital potentiometer.A rotary switch with resistors.I have used this in this fashion, works very well. At continuous operation you have to take into account head dissipation though a copper plane on a PCB or you have to put a tiny heatsink on it.But with intermitten use, there will be no thermal problem.Greetings,Peter

author: codered11343
author_rank: Newbie
timestamp: February 15, 2015, 04:24:55 pm
content: Quote from: PeterFW on February 15, 2015, 03:31:13 pmCheers Peter! That might be just what I am looking for. I will look more into it.