Limpkin's blog - Tag - pcb - Comments<div>An electronics geek blog, dedicated to sharing and open source. Check out my stores: <a href="https://lectronz.com/stores/stephanelec" hreflang="en" title="Lectronz store">EU</a> / <a href="https://www.tindie.com/stores/stephanelec" hreflang="en" title="tindie store">EU & US</a>.</div>2024-03-29T00:41:47+00:00Mathieuurn:md5:51de6a3d917257edeff5a252fe925b02DotclearCurrent controlled boost LED driver and black soldermasks - limpkinurn:md5:e5f94561f29c3d49277247b0c7756b1b2016-02-29T09:46:44+01:002016-02-29T09:46:58+01:00limpkin<p>@<a href="http://www.limpkin.fr/index.php?post/2012/08/12/Current-controlled-boost-LED-driver-and-black-soldermasks#c10551" rel="ugc nofollow">Xenocatalyst</a> : Unfortunately I have not!</p>Current controlled boost LED driver and black soldermasks - Xenocatalysturn:md5:5550fed2272a18ce3f3dbff12b4dd6b82016-02-29T02:12:24+01:002016-02-29T02:12:24+01:00Xenocatalyst<p>Have you gone any further with this design?<br />
I'm interested as I'm looking for something similar to drive cree's XHP70s that I can do at home.</p>Current controlled boost LED driver and black soldermasks - limpkinurn:md5:fbfbc6fbef8bdba6486bec2470ff3b112012-08-29T23:42:20+02:002012-08-29T22:42:39+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2012/08/12/Current-controlled-boost-LED-driver-and-black-soldermasks#c489" rel="ugc nofollow">Thomas Sarlandie</a> : nice! good luck!</p>Current controlled boost LED driver and black soldermasks - Thomas Sarlandieurn:md5:77a7cd09bac2f7ddfbbd9933b6f7792f2012-08-29T19:37:08+02:002012-08-29T22:42:39+02:00Thomas Sarlandie<p>@limpkin: great question ;) Right now the BOM is $37 in small quantity and $23 for 1000. This of course excludes the price of the LED which turns out to be by far the most expensive component.</p>
<p>I am trying to reduce that a little more by using a LT3476 (quad-channel controller) instead of 3 LT3518. Next version is being designed right now.</p>Current controlled boost LED driver and black soldermasks - limpkinurn:md5:18057c8549846ea344fb8e4a42fbd0fa2012-08-29T09:48:34+02:002012-08-29T08:49:56+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2012/08/12/Current-controlled-boost-LED-driver-and-black-soldermasks#c486" rel="ugc nofollow">Thomas Sarlandie</a> : Nice project you have there! what's your current BoM cost? The only thing i'd say about your schematics is that you don't have an error output (in case of short/open circuits) :-)</p>Current controlled boost LED driver and black soldermasks - limpkinurn:md5:66c8c155150ed7abc80498f99475b55a2012-08-14T23:29:44+02:002012-08-14T22:32:29+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2012/08/12/Current-controlled-boost-LED-driver-and-black-soldermasks#c384" rel="ugc nofollow">int0x2e</a> : Hi, thanks! Once again, it highly depends on your LEDs. The BoM of this particular boards costs 30$ for hobbyist qties, and has been made via seeedstudio fusion (so very cheap).</p>Current controlled boost LED driver and black soldermasks - int0x2eurn:md5:07d7867b8ee2cc81ae62989a68a301e82012-08-14T23:28:55+02:002012-08-14T22:32:29+02:00int0x2e<p>Hi,<br />
Great write-up!<br />
Any chance you could provide a rough estimate of the costs involved for production (BoM cost, PCB costs, etc.) in hobbyist quantities? (1-10)</p>
<p>Thanks,<br />
Itamar</p>Current controlled boost LED driver and black soldermasks - limpkinurn:md5:f6a80ca4778bdaa128a89d0d6f49fdb82012-08-14T23:27:41+02:002012-08-14T22:32:29+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2012/08/12/Current-controlled-boost-LED-driver-and-black-soldermasks#c382" rel="ugc nofollow">ejonesss</a> : Yep, I'll release them in the future, but I really doubt they would be useful to you, as they are highly dependent on the LEDs used :-)</p>Current controlled boost LED driver and black soldermasks - ejonesssurn:md5:1697608ab62e546aee94d4d37a2aac822012-08-14T23:24:49+02:002012-08-14T22:32:29+02:00ejonesss<p>if you cant give us any plans for it do you intend to in the future or make this as a ready made unit?</p>Current controlled boost LED driver and black soldermasks - limpkinurn:md5:081f6100b896d3f0e8eccd2db4904db32012-08-14T19:11:31+02:002012-08-14T18:11:54+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2012/08/12/Current-controlled-boost-LED-driver-and-black-soldermasks#c377" rel="ugc nofollow">Polcmods</a> : Yep! Sorry, I should have mentionned it</p>Current controlled boost LED driver and black soldermasks - Polcmodsurn:md5:25531329e176613f67d9e9d193c0e9722012-08-14T19:10:39+02:002012-08-14T18:11:54+02:00Polcmods<p>@Bodger, IMO the top wire goes across the inductor, so that it gets soldered to the PCB on two opposite ends. Just for better stability - no glueing and it cant twist off.</p>Current controlled boost LED driver and black soldermasks - limpkinurn:md5:d704062f45da9904eba0b75d413074412012-08-13T20:50:14+02:002012-08-13T19:50:39+02:00limpkin<p>@<a href="https://www.limpkin.fr/index.php?post/2012/08/12/Current-controlled-boost-LED-driver-and-black-soldermasks#c364" rel="ugc nofollow">Bodger</a> : Nope, that's just the way the inductor is :-)</p>Current controlled boost LED driver and black soldermasks - Bodgerurn:md5:3ae3e0a3c3d9f41ee2adb13127d825312012-08-13T20:31:41+02:002012-08-13T19:50:39+02:00Bodger<p>That's an odd looking toroidal inductor, with the wire going across the diameter on top. Is that just to get the leads to a desired position, or is it for current sensing or something like that?</p>