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3mm 1.5V bright LED
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Man-wai Chang
Oct 28, 2011, 6:37:15 AM10/28/11
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Is there such a toy?
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Ian Field
Oct 28, 2011, 4:36:58 PM10/28/11
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"Man-wai Chang" <toylet...@gmail.com> wrote in message
news:j8e0kr$ttb$1...@dont-email.me...
>
> Is there such a toy?
Yes if you use a 1.5V blocking oscillator.
> Is there such a toy?
bw
Oct 29, 2011, 4:16:29 AM10/29/11
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"Ian Field" <gangprob...@ntlworld.com> wrote in message
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Man-wai Chang
Oct 29, 2011, 8:30:10 AM10/29/11
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I want one that has the (over?) driver built into the LED... :)
Ian Field
Oct 29, 2011, 11:44:38 AM10/29/11
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news:j8grkj$28m$1...@dont-email.me...
LED drive chip and inductor for voltages down to 0.9V - that's probably as
small as it gets.
Can't remember details but if you google Elektor and click contact from
their home page, you can ask the editor.
>>> Yes if you use a 1.5V blocking oscillator.
>>
>> http://cappels.org/dproj/ledpage/leddrv.htm
>
> I want one that has the (over?) driver built into the LED... :)
Some time ago Elektor did a front cover freebie; a tiny PCB with a dedicated
>>
>> http://cappels.org/dproj/ledpage/leddrv.htm
>
> I want one that has the (over?) driver built into the LED... :)
LED drive chip and inductor for voltages down to 0.9V - that's probably as
small as it gets.
Can't remember details but if you google Elektor and click contact from
their home page, you can ask the editor.
Spehro Pefhany
Oct 29, 2011, 12:03:36 PM10/29/11
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On Fri, 28 Oct 2011 18:37:15 +0800, the renowned Man-wai Chang
<toylet...@gmail.com> wrote:
>
>Is there such a toy?
You could use this simple circuit to work down to <<1V --
<toylet...@gmail.com> wrote:
>
>Is there such a toy?
FB = OUT for Red
FB = GND for Green/Blue/White
|
.----------.
Vin 0.8V minimum | FB |
10uH | |
___ | L6920 | LED
o----+---UUU----|LX OUT|----+->|---+
+ | | | | |
--- | | | |
--- | REF | | .-.
47uF | '----------' | | |
| | + | |
GND 100n --- --- '-'
--- 47uF --- |
| |
GND GND GND
All the parts can be tiny SMT components. Reduce the 47uF caps to 22uF
and use 0805 22uF/6.3V ceramics and an 0805 inductor to reduce size,
and the 100n can be an 0402.
Best regards,
Spehro Pefhany
--
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Ian Field
Oct 29, 2011, 5:39:27 PM10/29/11
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news:j8grkj$28m$1...@dont-email.me...
>>> Yes if you use a 1.5V blocking oscillator.
>>
>> http://cappels.org/dproj/ledpage/leddrv.htm
>
> I want one that has the (over?) driver built into the LED... :)
http://www.elektor.com/magazines/2006/november/pr4401-led-driver.58609.lynkx
>>
>> http://cappels.org/dproj/ledpage/leddrv.htm
>
> I want one that has the (over?) driver built into the LED... :)
Spehro Pefhany
Oct 29, 2011, 7:50:00 PM10/29/11
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