[Noisebridge-discuss] [dorkbotsf-blabber] DC-DC Power conversion - Cheapish finds!

[Carl Pisaturo]

+1

In systems where there is, say, a 24VDC power bus and you need some regulated 5VDC somewhere, these things are lifesavers.   http://www.digikey.com/product-detail/en/PT5101N/PT5101N-ND/210844  $17 seems like a lot for a drop-in replacement for a 7805 voltage regulator, until you realize that the sink/fan/board real estate/ventilation holes/etc to remove the heat from the 7805 would cost way more than that.  

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From: Anders Nelson 
Sent: Monday, January 07, 2013 11:47 AM
To: Dorkbot Dorkbot ; noisebridge-discuss at lists.noisebridge.net 
Subject: [dorkbotsf-blabber] DC-DC Power conversion - Cheapish finds!

Hey all, 

I found some awesome DC-DC non-isolated convertors on Digikey, perhaps you can benefit from my toils in their search fields. They are all really compact and handle a buttload of current. Input and output voltage ranges vary, but these were the cheapest and most available units I found.

You may ask "Why would I pay ten bucks for a switching convertor when I can pay fifty cents for an LDO?" The answer is heat dissipation and efficiency. If you don't want to burn people/things and/or literally reduce your battery life by half (in the case of 12v -> 6v conversion), you should use a switcher.

-3A: http://www.digikey.com/product-detail/en/PT6304N/PT6304N-ND/278552

-10A: http://www.digikey.com/product-detail/en/OKR-T%2F10-W12-C/811-2180-ND/2199630

-6A: http://www.digikey.com/product-detail/en/OKR-T%2F6-W12-C/811-2179-ND/2199629

-3A: http://www.digikey.com/product-detail/en/OKI-T%2F3-W32P-C/811-2287-1-ND/2708573

And here are some enclosures sized well to protect them:

http://www.boxenclosures.com/category/category_product.html?cats__id=612

You can, of course, build your own DC-DC convertor much cheaper. But when you haven't the time these can save your potato.

=]
--
Anders Nelson

+1 (517) 775-6129

www.erogear.com


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