Microchip, SOT23−5 housing in small circuit.. Hard to identify.

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Tuffe

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Can someone please help me ? Several Leds, inside a series of "professional" RGB - DMX controlled Led-light fixtures, stopped to function as they should, and the supplier refuses to give me any technical information at all. :-(
I have identified a small component who visually have all signs of breakdown, but even i have all the numbers on top of it, i am not able to identify it.
As i have no documentation, i do not even know the function of the circuit, but i guess it supports the dimming..
I have added picture of both the small circuit, and the component in close up, and I highly appreciate every thoughts about what this might be.. The marking seems to be: 318 T885A... SOT23−5

 

The inductor and SS12 diode indicate that this is most likely a voltage converter ic.
I can not find it in Small_SMD-Markings_Turuta-2010.pdf
 

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