Re: Unknown Surface Mount Component
they are used in chinese lights in groups of upto 8, i'm sure there wont be a problem.
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Re: Unknown Surface Mount Component
Originally posted by budm View PostWhy not? Do you not know the Voltage source, the load current, etc.?
The answer seems reasonable to me ....
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Re: Unknown Surface Mount Component
Originally posted by budm View PostPage 4 of the AMC7135 spec sheet has the Pd calculation.
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Re: Unknown Surface Mount Component
Page 4 of the AMC7135 spec sheet has the Pd calculation.
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Re: Unknown Surface Mount Component
Originally posted by budm View Post3.6V Voltage source feeding LM317 CC circuit to drive White LED (Vf of 3V @200aM) is not going to work because 317 has internal 1.25Vref, you will need more than 3.6V Voltage source.
Build it and take some data.
STJ suggested the AMC7135 ... it looks pretty tight ...
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Re: Unknown Surface Mount Component
Originally posted by EasyGoing1 View PostIt took a fully charged 18650 like a champ and managed to source 1.4 amps from it ... damn near burning my skin before it ever fried, so it's a pretty decent LED ... What I really want to do with this thing is power it from a couple of 18650's at a respectable brightness - maybe 200ma .... with just an on / off feature, no blinking or any of that fancy stuff. I might just stick with the LMN317 constant current config ... seems to be reliable although maybe a little too lossy ...
Build it and take some data.Last edited by budm; 11-07-2018, 10:44 AM.
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Re: Unknown Surface Mount Component
then you need one of these:
they are made for this job, if you want more current you just put 2 or more in parallel.
you get a strip of 10 for under $2 on aliexpress.Attached Files
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Re: Unknown Surface Mount Component
Originally posted by stj View Postseriously?
that's rare.
well they could be anything - .5w, 1w, or 3w
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Re: Unknown Surface Mount Component
seriously?
that's rare.
well they could be anything - .5w, 1w, or 3w
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Re: Unknown Surface Mount Component
Originally posted by stj View Postwell a Q5 is 350mA and a T6 is 700mA - assuming your not overdriving them.
if it has zoom or you have a magnifier,
a Q5 has 3 rectangular segments and a T6 has 6.
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Re: Unknown Surface Mount Component
well a Q5 is 350mA and a T6 is 700mA - assuming your not overdriving them.
if it has zoom or you have a magnifier,
a Q5 has 3 rectangular segments and a T6 has 6.
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Re: Unknown Surface Mount Component
https://www.ledgroupbuy.com/cree-model-comparison/
When you bought that flash light, what does the seller say/claim?
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Re: Unknown Surface Mount Component
Originally posted by stj View Posta better question, is what is the pcb diameter and how badly do you want to fix it?
there are better boards on ali-express.
do you know the led type? Q5? T6?
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Re: Unknown Surface Mount Component
Originally posted by budm View PostMulti-Mode: Low beam, Medium beam, High beam, Strobe, and SOS modes.
Or it has just ON and OFF.
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Re: Unknown Surface Mount Component
It appears to be flashlight LED controller + MCU. Some IC's have linear constant-current control and others have buck converter to do that for higher efficiency.
My guess is YX8133A by shiningic but hell to translate. Replaced by YX8231B or YX8232B. I can't find much for SMD marking codes.
If you have an inductor stashed away somewhere, it is a buck-converter type.
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Re: Unknown Surface Mount Component
Originally posted by EasyGoing1 View PostI have not removed anything from that circuit board ... thats all that was on there, those two components. I assume the little box is a resistor.
What do you mean by "100% or off - no multi-mode"?
Or it has just ON and OFF.
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Re: Unknown Surface Mount Component
Originally posted by stj View Postit's a chip - custom.
did you remove some resistors?
those chips only handle 1.4A, the board usually has some parallel resistors to limit the led current.
if your trying to fix it, you can bypass it for 100% or off - no multi-mode.
What do you mean by "100% or off - no multi-mode"?
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Re: Unknown Surface Mount Component
it's a chip - custom.
did you remove some resistors?
those chips only handle 1.4A, the board usually has some parallel resistors to limit the led current.
if your trying to fix it, you can bypass it for 100% or off - no multi-mode.
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