Where can I find a SMPS schematic, 10A 3V out 10-26V input ?
- Thread starter manie
- Start date
What you should do is go to an electronic component seller's website and do a parametric search according to your specification. Example: Farnell. If you then look at the datasheet for the device you want, it will show you a circuit diagram in the 'typical applications' section.
Mmmm... if you'd looked (as I suggested that on 1st April Post #21) you could have had a dozen Data Sheets and Application examples on your PC by now.... 
You have 2 basic options; an integrated switcher or a switching controller (like I said in that same post ).
Sadly, many are fiddly little SMD. I reckon an LM315x + bits would fit the bill.
ALWAYS read the full specs before parting with the cash.
There are probably a dozen similar items. Check the BOMs required and ALWAYS pay attention to component specs and recommended layouts with switchers.... unless you are 'happy with crappy'
You have 2 basic options; an integrated switcher or a switching controller (like I said in that same post ).
Sadly, many are fiddly little SMD. I reckon an LM315x + bits would fit the bill.
ALWAYS read the full specs before parting with the cash.
There are probably a dozen similar items. Check the BOMs required and ALWAYS pay attention to component specs and recommended layouts with switchers.... unless you are 'happy with crappy'
Dippy
Point taken and well made ! I was on the web with National Semi LM3150 and opted for their 10A output 250MHz demo boards (2 off). Shipping is darned expensive at US $60.00 but they claim 2 to 3 days !!!! I will have them on the fourth day !!! They do not know S.A. ..........................
The eval board will prove or disprove the 10A claim, we will see. Thanks for the heads-up though, I appreciate it...............
Manie
Point taken and well made ! I was on the web with National Semi LM3150 and opted for their 10A output 250MHz demo boards (2 off). Shipping is darned expensive at US $60.00 but they claim 2 to 3 days !!!! I will have them on the fourth day !!! They do not know S.A. ..........................
The eval board will prove or disprove the 10A claim, we will see. Thanks for the heads-up though, I appreciate it...............
Manie
BeanieBots
Moderator
$60 just for shipping!
You could have one of these for the same money and no agro or building involved.
http://uk.farnell.com/tdk-lambda/ls50-3-3/psu-enclosed-3-3v-10a-50w/dp/1657435
Might not have the input range you require but nothing a little mod couldn't put right.
You could have one of these for the same money and no agro or building involved.
http://uk.farnell.com/tdk-lambda/ls50-3-3/psu-enclosed-3-3v-10a-50w/dp/1657435
Might not have the input range you require but nothing a little mod couldn't put right.
The title implies dc-dc...
What you're asking for is just a buck converter. There's mountains of information on this topic on google.
or just buy this and be done http://www.ebay.com/itm/HIGH-95-Eff-100W-15A-DC-power-supply-converter-module-10-15V-to-0-9-12V-buck-/280820759746?pt=LH_DefaultDomain_0&hash=item416238bcc2#ht_4031wt_1360
What you're asking for is just a buck converter. There's mountains of information on this topic on google.
or just buy this and be done http://www.ebay.com/itm/HIGH-95-Eff-100W-15A-DC-power-supply-converter-module-10-15V-to-0-9-12V-buck-/280820759746?pt=LH_DefaultDomain_0&hash=item416238bcc2#ht_4031wt_1360
lol but wouldn't any already made product not qualify since he says hes looking for a schematic. People don't always know what they're looking for so I try to offer alternative suggestions when I think it could be helpful. Some things are always better bought than built, unless you're strictly building for the learning experience.
I agree. I think some want to jump into some projects without the experience to know when it's not really the way to go. Buying already made and do a mod somewhere else to compensate can make sense in many ways.
For myself, if 26V input was absolutely unavoidable, I would be looking at a 24v inverter driving an old pc supply unit. (or a new one)
Inverter here for $20.00 .....http://www.ebay.com.au/itm/0019-0025-Car-Power-Inverter-DC24V-AC220V-100W-/130671940389?pt=LH_DefaultDomain_0&hash=item1e6ca79325
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Thanks ALL !!!
I will have a look at the eval boards from National (Mouser sypplies it)............ I am sure it will meet with the requirements at 3V out = 30W @ 10A.
Thanks for all the heads up's, there are lots of stuff out there to buy, but e-bay, NAH !!!!! They normally just have 1 or 10 and thats it ! Maybe I require
more than that ????
Manie
I will have a look at the eval boards from National (Mouser sypplies it)............ I am sure it will meet with the requirements at 3V out = 30W @ 10A.
Thanks for all the heads up's, there are lots of stuff out there to buy, but e-bay, NAH !!!!! They normally just have 1 or 10 and thats it ! Maybe I require
more than that ????
Manie
If you read the description of the eBay listing it says that the input voltage range is 20-28V. Therefore you could use it. But using it to drive another transformer would just add extra inefficiency.
I did not see any reference to efficiency requirements all-be -it rather odd request to begin with.
The call was for a circuit diagram which I doubt would show any efficiency ratings if one could be found.
I imagine the idea is to build from scratch and if so, can anyone take a stab at what the efficiency might be?
As MikeGyver said, some things might be better bought than built and this was my point also.
The call was for a circuit diagram which I doubt would show any efficiency ratings if one could be found.
I imagine the idea is to build from scratch and if so, can anyone take a stab at what the efficiency might be?
As MikeGyver said, some things might be better bought than built and this was my point also.
BeanieBots
Moderator
From an earlier thread, the initial discussion was about a linear design, so I don't think efficiency is an issue except for the local heating aspect.
As for home-brew designs from scratch, efficiency better than an off-the-shelf design can often be obtained because it is possible to tailor to the exact input-output requirements (eg wind your own transformer). Better than 95% should not be too hard with a buck converter because it involves only one switching transistor and an inductor. If isolation between input and output is not an issue, the switch could be low side (draw a regular buck upside-down) and get even better efficiency by using a lower RDSon transistor. So many choices, it's hard to know where to start.
As for home-brew designs from scratch, efficiency better than an off-the-shelf design can often be obtained because it is possible to tailor to the exact input-output requirements (eg wind your own transformer). Better than 95% should not be too hard with a buck converter because it involves only one switching transistor and an inductor. If isolation between input and output is not an issue, the switch could be low side (draw a regular buck upside-down) and get even better efficiency by using a lower RDSon transistor. So many choices, it's hard to know where to start.
I have purchased 2 x LM3150-250KHz Eval Boards and they arrived today. Quick testing into a 0R25 10W resistor shows them to be GOOD at +- 3.25V ach at 10A. Will let you know how it goes...........
However, how do I parallel them so that they deliver 10A EACH into the SAME load, that is 20A when used together and I do not mean power SHARING..........???????
Manie
EDIT:
Anyone ????
However, how do I parallel them so that they deliver 10A EACH into the SAME load, that is 20A when used together and I do not mean power SHARING..........???????
Manie
EDIT:
Anyone ????
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