Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




983 posts

Ultimate Geek
+1 received by user: 33


Topic # 96971 8-Feb-2012 13:05 Send private message

So I was looking around ebay and came across these advertised as adjustable auto step up/down switching regulators with pretty decent efficiency, would be good for a bunch of small hobby solar panels I have to more efficiently play around with than using linear regulators (every watt counts!).

http://www.ebay.com.au/itm/DC-DC-adjustable-LM2577-auto-step-down-up-power-supply-module-solar-power-panel-/150751998645?pt=LH_DefaultDomain_0&hash=item231984f2b5#ht_2566wt_1099
S
o that seems cheap, but look at the picture.  I'm no electronics guy, but I only see 1 IC on that board, an LM2577, which I think only boosts, not bucks.  The picture of it working shows it boosting 12v to 24v.  

Is there anything on that board that would suggest to somebody who actually knows what they are doing that this board would also be capable of bucking as well as boosting?

If we look for example at this one instead
http://www.ebay.com.au/itm/LM2596-LM2577-Power-step-up-down-4-35V-1-25-25V-/170694302069?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item27be2c5975#ht_3750wt_1092
it has both an LM2577 to boost and an LM2596 to buck.
 
Same with this one
http://www.ebay.com/itm/DC-DC-Converter-Step-up-down-In3-5-28V-Out1-25-26V-Adjustable-LM2596S-LM2577S-/320817352806?pt=LH_DefaultDomain_0&hash=item4ab2345066#ht_2212wt_1326
both 2577 and 2596.


 




---
James Sleeman

My hobby - listing small amounts of interesting/useful hobby electronic components hardware and stuff on Trademe for cheap, all good geek stuff for the "maker" revolution ;-)

Tip for Trademe addicts: install an addon for your browser to get thumbs for all listings.

Create new topic


983 posts

Ultimate Geek
+1 received by user: 33


  Reply # 578714 8-Feb-2012 14:59 Send private message

Replying to myself, it took some digging, but I think it must be following  this design

http://www.ti.com/lit/an/slua181/slua181.pdf

 
also here

http://www.wseas.us/e-library/transactions/circuits/2010/88-131.pdf 




---
James Sleeman

My hobby - listing small amounts of interesting/useful hobby electronic components hardware and stuff on Trademe for cheap, all good geek stuff for the "maker" revolution ;-)

Tip for Trademe addicts: install an addon for your browser to get thumbs for all listings.

Create new topic








Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when new jobs are posted to our jobs board:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:




News »

Trending now »
Hot discussions in our forums right now:

galaxy s4 now on 4.4.2
Created by nzrock, last reply by timmmay on 17-Apr-2014 23:00 (40 replies)
Pages... 2 3


Forms of government for New Zealand
Created by charsleysa, last reply by MrMistofeles on 17-Apr-2014 22:22 (85 replies)
Pages... 4 5 6


Business vs Residential UFB, why the huge difference in cost??
Created by dman, last reply by dman on 16-Apr-2014 23:45 (22 replies)
Pages... 2


Problem with NDSCam
Created by haydenmarsh, last reply by Benoire on 14-Apr-2014 21:28 (21 replies)
Pages... 2


MH370 - Call for Search & Rescue Help
Created by DS248, last reply by Sideface on 17-Apr-2014 17:28 (735 replies)
Pages... 47 48 49


Is it legal to rip your own DVD in New Zealand?
Created by PSlover14, last reply by SamF on 17-Apr-2014 23:46 (18 replies)
Pages... 2


Weather - Auckland
Created by networkn, last reply by Sidestep on 17-Apr-2014 13:47 (18 replies)
Pages... 2


True cost of driving ..
Created by rayonline, last reply by alasta on 14-Apr-2014 20:43 (52 replies)
Pages... 2 3 4



Geekzone Live »
Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.