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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.


 




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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 ;-)

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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








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