[solved] Anyone recognize this manufacturer's logo?

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I'm trying to track down this component, but I don't recognize the manufacturer. Does anyone recognize the logo from this chip?

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Cheers,

Tom

Last Edited: Sun. Dec 4, 2011 - 04:44 PM
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Cannot help you with the logo Tom ... but how are you settling back into the US after leaving China?

Cheers,

Ross

Ross McKenzie ValuSoft Melbourne Australia

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Ross,

Couldn't be better. I'm finally at the place where I should have been 20 years ago. Great group of people and a different challenge every day!

Cheers,

Tom

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Ross,

Let's try this from a different direction. Would a Transient Voltage Suppressor (Transil) make sense in the circuit below for the component in question?

When I measure Vcc with the lamp module removed, I get 16V. With the module installed, I get 9.4-9.6VDC which is what I would expect if it were a constant current driver (I can't gain access to the board the lamp module plugs into.)

Some of the boards have this component with an LE code and some have an LP code. Looking at TVS devices on Digikey, I found 8 different TVS manufacturers who use the LE code for a 12V standoff TVS and use LP for a 16V standoff TVS - both of which would seem reasonable values based on the voltages I've observed ***IF*** a TVS makes sense for the missing component.

I know enough about digital electronics to get into trouble and even less about analog stuff. Can anyone shed some light on this?

Attachment(s): 

Cheers,

Tom

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could the part in question be for reverse polarity protection? The idea being the diode shorts out the supply to save the led's?

Jim

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Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Diodes Inc?
(not joking - that is the company name)

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Can you spot the logo here?

http://www.elnec.com/support/ic-...

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Tom,

I would have said a simple diode for reverse protection. Is the light module connections unpolarised?

And the 16 down to 9.x volts sounds more like a current limiting resistor inside the module you cannot get to. I would probably substitute a few resistor values and deduce the hidden resistor's value.

Cheers,

Ross

Ross McKenzie ValuSoft Melbourne Australia

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It's a uni-directional TVS, providing both reverse polarity protection and transient voltage protection. And its usage is correct in the schematic you provided.

The voltage drop could very well be the result of a CC power supply, as is commonly used for white LED drivers.

As for the logo, it is Diodes Inc [ www.diodes.com ]
The 3 digit code is the manufacturing code. The two letter code is the device type. The LE is a SMBJ12A, and the LP is a SMBJ16A. The substitution you see is probably just a revision, or based on availability, as the breakdown voltage is probably not all that important in this case. HTH

Writing code is like having sex.... make one little mistake, and you're supporting it for life.

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That Unitrode logo has the same U but with an underbar instead of the dots.

Imagecraft compiler user

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Thanks, Guys. That confirms my suspicions and I appreciate the education about TVSs.

Cheers,

Tom