Unknown Surface Mount Component

[stj]

Re: Unknown Surface Mount Component

they are used in chinese lights in groups of upto 8, i'm sure there wont be a problem.

[EasyGoing1]

Re: Unknown Surface Mount Component

Why not? Do you not know the Voltage source, the load current, etc.?

The answer seems reasonable to me ....

[budm]

Re: Unknown Surface Mount Component

Are you wanting me to figure it out?

Why not? Do you not know the Voltage source, the load current, etc.?

[EasyGoing1]

Re: Unknown Surface Mount Component

Page 4 of the AMC7135 spec sheet has the Pd calculation.

Are you wanting me to figure it out?

[budm]

Re: Unknown Surface Mount Component

Page 4 of the AMC7135 spec sheet has the Pd calculation.

[EasyGoing1]

Re: Unknown Surface Mount Component

3.6V 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.

Thats why I was thinking of using TWO 18650's in series ... but what really bothers me about the LM317 option is all the waste ... id be recharging batteries too often ...


STJ suggested the AMC7135 ... it looks pretty tight ...

[budm]

Re: Unknown Surface Mount Component

It 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 ...

3.6V 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]

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.

[EasyGoing1]

Re: Unknown Surface Mount Component

seriously?
that's rare.
well they could be anything - .5w, 1w, or 3w

It 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 ...

[stj]

Re: Unknown Surface Mount Component

seriously?
that's rare.
well they could be anything - .5w, 1w, or 3w

[EasyGoing1]

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.

So the LED looks exactly like these ...

[stj]

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.

[budm]

Re: Unknown Surface Mount Component

https://www.ledgroupbuy.com/cree-model-comparison/
When you bought that flash light, what does the seller say/claim?

[EasyGoing1]

Re: Unknown Surface Mount Component

a 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?

The diameter of the PCB is exactly 20mm ... and I looked on the LED for ANY identifying markings, and I found none .... HOWEVER ... when I connect a 4.2 volt 18650 battery directly to the LED (no current limiting resistor at all), it lights up like an angel from heaven just popped in the room ... and it draws 1.5 amps which I feel is WAY TOO HOT to run that led ... but at least we know what it CAN do although it got hot so fast, I think it might burn out at that kind of continuous draw ... when I put a CC power supply on it at no more than 4.5 volts at 250ma its nice and bright..... if that tells you anything ...

[EasyGoing1]

Re: Unknown Surface Mount Component

Multi-Mode: Low beam, Medium beam, High beam, Strobe, and SOS modes.
Or it has just ON and OFF.

Oh - yeah ... it has High, Low, and Strobe, but I'd be ecstatic if I could make it just do HIGH and OFF.

[stj]

Re: Unknown Surface Mount Component

a 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?

[redwire]

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.

[budm]

Re: Unknown Surface Mount Component

I 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"?

Multi-Mode: Low beam, Medium beam, High beam, Strobe, and SOS modes.
Or it has just ON and OFF.

[EasyGoing1]

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.

I 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"?

[stj]

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.