3mm 1.5V bright LED

[Man-wai Chang]

Is there such a toy?

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[bw]

Yes if you use a 1.5V blocking oscillator.

http://cappels.org/dproj/ledpage/leddrv.htm

 

[Man-wai Chang]

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...


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[Spehro Pefhany]

Is there such a toy?

You could use this simple circuit to work down to <<1V --


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

 

[Spehro Pefhany]

http://www.elektor.com/magazines/2006/november/pr4401-led-driver.58609.lynkx

Presumably this part?

http://www.prema.com/pdf/pr4401.pdf


Best regards,
Spehro Pefhany