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Article #133Re: Best way to power array of LEDs?
From: Nucharin W. Jansen
Date: Thu, 07 Nov 2002 21:15
Date: Thu, 07 Nov 2002 21:15
22 lines
2741 bytes
2741 bytes
oh! I see. Thank you very much. That why he parallel at 3.1v instead of 3.6v Lizard Blizzard wrote: > > > http://www.ResurgentSoftware.com/Perfect_LED_Light.html > > > He parallels all LEDs together without any resistor to > > constant voltage regulator. > > If you read the rest of it, he says that the LEDs are all run at > substantially below their maximum current to get better efficiency. > Something like 8 mA, in one of his designs. So if you have one LED that > has substantially lower Vf, and it decides to hog twice the current, > then it's still only 16 mA, which is well below the maximum, so no big > deal. But putting LEDs in parallel without Vf matching and running them > at or near maximum is just an invitation for self-destruction. > > > At last week, I thought the same as him but I plan to do with > > MAX757 ( DIP300 ) stepup IC from batt only 1 or 2 cells. > > But after read several articles here, I get confuse so much.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2002-11-07 13:30:30 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed.media.kyoto-u.ac.jp!teleglobe.net!news.cscoms.com!not-for-mail From: "Nucharin W. Jansen" <tong@fanwap.com> Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Date: Fri, 08 Nov 2002 04:15:42 +0700 Organization: C.S. Communications Co. Ltd. Lines: 22 Message-ID: <3DCAD7FD.9E0706F2@fanwap.com> References: <0001HW.B9C26E7400A7161B165FEAC0@news.covad.net> <Rsan9.14070$qh1.1622310@news.ca.inter.net> <2Qan9.3129$cS4.107732@news2.tin.it> <3DC843FE.4A25FFF3@fanwap.com> <aqblsd$10119$1@hades.csu.net> <3DC99AD4.2AB0FE52@fanwap.com> <3DC9A173.812F4764@fanwap.com> <3DC9B37F.453F9C41@fanwap.com> <aqe562$10bf9$1@hades.csu.net> NNTP-Posting-Host: dial-12.ras-31.bkk.c.cscoms.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: news.cscoms.com 1036703768 90066 202.183.254.107 (7 Nov 2002 21:16:08 GMT) X-Complaints-To: abuse@cscoms.com NNTP-Posting-Date: Thu, 7 Nov 2002 21:16:08 +0000 (UTC) X-Mailer: Mozilla 4.8 [en] (Windows NT 5.0; U) X-Accept-Language: en