15v switch mode regulator

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I need to come up with a 24v in - 15v out 1 amp or less switching regulator for a project I'm working on.   10k+ units needed so cost is important, looking for min of external parts needed as well.   We want to build this module our selves and not use a china made unit.  Done that, that is why we are looking to build our own. 

I know there are LOTs to choose from, but just looking to narrow the search down, so what have you used successfully in the past.

TIA

 

Jim

 

This topic has a solution.

Last Edited: Tue. May 16, 2017 - 01:10 PM
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Not actually used myself, but a couple I'd start looking at:

 

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The LM2576 is whats on the Chinese power boards you can get for peanuts on ebay:

 

http://www.ti.com/lit/ds/symlink...

 

I myself thought about making my own but the Ebay modules(which can also be purchased on Alibaba/Aliexpress) made the idea silly for me.

 

at 10k units though for you it might pay though.

 

40 to 60v in, then pick your output voltage.

 

Jim

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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This is the one we are using:  https://www.amazon.com/gp/product/B018JWCX8M/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

but getting it in the qty we want has been the problem, so would like to make it our self, but can not find the reg in stock anywhere.

Looking at the simple TI parts, they seem to operate at a lower freq, so the parts (coil) is too big for the application, it's about the size of the whole board.

Emails to MPS have gone unanswered!??

 

Jim

 

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No doubt the clinching feature was:

Gift-wrap available

 

laugh laugh

 

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One of my Ebay modules has the LM2596, almost guaranteed to be a fake, like all LMxxxx regulators you can buy on Ebay. Another one has a XL6009E1, which seems to be a Chinese knockoff of the LM chip from some Chinese manufacturer, XLSemi. I always prefer to buy Chinese stuff with chips marked with Chinese brands, since the others are probably fake anyway (remarked).

 

But back to the OP question, check out the AZ34063 from Diodes Inc., it's quite cheap. Never used it, though.

 

Edit: Here is a discussion at EEVblog about 34063 type regulators: https://www.eevblog.com/forum/beginners/12-gt-12-buck-converter-design/

Last Edited: Mon. May 15, 2017 - 09:42 PM
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ki0bk wrote:
This is the one we are using: ... [MP1584]

but getting it in the qty [10k+] we want has been the problem, so would like to make it our self, but can not find the reg in stock anywhere.

Future Electronics has 1 reel of 2500 in stock with one reel arriving for each month of June, July, and August.

At Mouser, the lead time is stated as 8 weeks.

ki0bk wrote:
Emails to MPS have gone unanswered!??
Then one is off to the distributors.

Some manufacturers have good sample and small quantity ordering then defer to distributors for multiple trays and/or reels.

 


http://www.monolithicpower.com/Products/Product-Detail/101/Step-down(Buck)/SwitchingRegulators/DC-DCPowerConversion/Converters/MP1584 (28V, 3A, 1.5MHz, buck)

http://www.futureelectronics.com/en/Technologies/Product.aspx?ProductID=MP1584ENLFZMONOLITHICPOWERSYSTEMS1045651

http://www.mouser.com/Search/Refine.aspx?Keyword=mp1584

https://octopart.com/search?q=mp1584&avg_avail=(1__*)&start=0

 

"Dare to be naïve." - Buckminster Fuller

This reply has been marked as the solution. 
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have you tried Aliexpress directly (not via amazon/ebay)

One of the first shops I tried claims to have 10k chips on the shelf:

https://www.aliexpress.com/item/...

 

But for quantities like these it's probably better to go to alibaba instead of aliexpress.

Alibaba is closer to the manufactories. They don't always have prices on the 'net but often qoute how many items they can deliver.

For example, this shop claims to be able to deliver 10k chips/week.

 

http://www.alibaba.com/product-d...

 

 

Paul van der Hoeven.
Bunch of old projects with AVR's:
http://www.hoevendesign.com

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@Jim

 

I erred in the part number.  It's LM2596.

 

Here is the unit I use:

 

 

THey work really well.

 

Sorry about the mistake.

 

Jim

 

If you want a career with a known path - become an undertaker. Dead people don't sue! - Kartman

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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Kartman wrote:
I'm not sure if the pricing is going to be to your liking, but it is a simple solution.
yowsa

Best could find was the inexpensive 15V half amp module (18 .. 28Vdc in) :

http://www.mouser.com/ProductDetail/RECOM/R-78E15-05/?qs=%2fha2pyFadujCcqkduAdvfsLlicWPgyMlQPOdZI2whpkCTyYbF1Q6ng%3d%3d

or the inexpensive 12V 1A module (15 .. 42Vdc in) :

http://www.mouser.com/Search/Refine.aspx?Keyword=R-78T12-1.0%2fAC-TRAY

 

Edit : 12V

 

"Dare to be naïve." - Buckminster Fuller

Last Edited: Mon. May 15, 2017 - 11:06 PM
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Paulvdh wrote:

have you tried Aliexpress directly (not via amazon/ebay)

One of the first shops I tried claims to have 10k chips on the shelf:

https://www.aliexpress.com/item/...

 

But for quantities like these it's probably better to go to alibaba instead of aliexpress.

Alibaba is closer to the manufactories. They don't always have prices on the 'net but often qoute how many items they can deliver.

For example, this shop claims to be able to deliver 10k chips/week.

 

http://www.alibaba.com/product-d...

 

That was my next stop!  Thanks!

 

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jgmdesign wrote:

@Jim

 

I erred in the part number.  It's LM2596.

 

Here is the unit I use:

 

 

THey work really well.

 

Sorry about the mistake.

 

Jim

 

Thanks Jim,  I have a few of those at home!  But will not fit in the space needed for this project at work.

 

 

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Another Recom that's a new arrival at Mouser though no quantity yet (ETA 21-July-2017) with a 10 week lead time :

Mouser Electronics

RECOM Power

Non-Isolated DC/DC Converters 18-32Vin 15Vout 2A SIP3

http://www.mouser.com/ProductDetail/RECOM/R-78B15-20/?qs=X3130gGoUcvj14qcbyYKtQ%3d%3d

via

http://www.mouser.com/new/RECOM/recom-r-78b-2-converters/

 

"Dare to be naïve." - Buckminster Fuller