At 04:05 PM 12/17/2009, you wrote:
>Good day to all.
>
>I recently purchased a LED flashlight that runs from a single 1.5V
>"AA" cell.  Upon disassembling it, I see a total of 3 electronic
>components: the LED, a 10uH axial inductor and a 3-legged to-92
>device labelled "TX2115".
>
>I haven't yet tried to measure output current or efficiency but hope
>to do so soon.
>
>My Google search for "tx2115" turns up only one close hit: a Chinese
>site showing that part number and describing it as a Boost LED
>driver.  But: the picture is for a 4-legged to-92 device, not 3-legged.
>
>Anyone have any idea where I might find a datasheet for this device
>and, better yet, where to purchase them from?

Obviously quite a high frequency switcher-- 500kHz or more, most likely,.

You might try contacting the Chinese company, perhaps the photo is in
error; in any case they may be able to help you.

Zetex makes some similar devices, but they are much lower tech- at least
10x as big inductor IIRC.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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