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Title: luxeon 1W LED driver Post by: tris400 on June 10, 2011, 03:58:20 15:58 I need 1W LED driver circuit for 3v battery supply,should be boost converter i think.(because LED is 3.4v and 350 mA current draw ).can anybody help me.thanx
Title: Re: luxeon 1W LED driver Post by: TomJackson69 on June 10, 2011, 06:48:14 18:48 Try this LT1073. The LT1073 can converts from single cell 1.5V (or two cells 3V) to 5 Volts.
Tom link to data sheet: http://cds.linear.com/docs/Datasheet/1073fa.pdf (http://cds.linear.com/docs/Datasheet/1073fa.pdf) Title: Re: luxeon 1W LED driver Post by: solutions on June 11, 2011, 01:13:47 01:13 Sorry Tom - that's not going to work. He needs to convert a single cell (good luck with that one) or two cells to 350mA constant current. A DC-DC won't do it in most cases.
A number of companies make HBLED drivers these days. IR. TI, National among others. <spins the wheel> Try this one: http://www.nxp.com/documents/data_sheet/SSL3250A.pdf As I said, everybody and his dog have a HB LED current driver now. FWIW, you're going to need a really high mAh battery (ies). The LEDs run at 3V, so if you run it off a 1.5V cell, assuming an unrealistic efficiency of 100%, you'll be pulling 700mA. Run it at 80%, and now you're pulling 875mA PLUS the driver chip current, whatever that is. |