Re: LED bicycle light
From: Ban (bansuri_at_web.de)
Date: 09/18/04
- Next message: Tom Seim: "Re: Kerry's Improbable Medals"
- Previous message: Robert Wolcott: "Isnt' there a politics newsgroup?"
- In reply to: Ryan: "LED bicycle light"
- Next in thread: Ryan: "Re: LED bicycle light"
- Reply: Ryan: "Re: LED bicycle light"
- Messages sorted by: [ date ] [ thread ]
Date: Sat, 18 Sep 2004 04:28:57 GMT
Ryan wrote:
> I'm designing a bicycle light as the darkness is becoming longer and
> longer this time of year.
>
> I have selected the Luxeon III LEDs as they have good power in a small
> package. I plan to use 3 of these LEDs in a single housing with the
> Fraen trilens. Each LED will have its own power supply. These
> require 4.5V at 700mA.
>
> So my question is regarding the power supply. The battery is a NiMH
> 10.8V pack. I would like a constant current switch mode supply and
> the maximum efficiency possible. It would be desired, but not
> required, to run at lower than 700mA.
>
With the LT1618 you can implement a tiny constant current switcher with
options of current adjustment and on/off switch. Only a few external
components needed. See design notes in EDN.
-- ciao Ban Bordighera, Italy
- Next message: Tom Seim: "Re: Kerry's Improbable Medals"
- Previous message: Robert Wolcott: "Isnt' there a politics newsgroup?"
- In reply to: Ryan: "LED bicycle light"
- Next in thread: Ryan: "Re: LED bicycle light"
- Reply: Ryan: "Re: LED bicycle light"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
