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Mystery driver




paul1598419

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OMG, you need to resize these as they are too large for anything around here. I'm sure one of us has seen this before, once I can see it well enough.
 

micksterbs

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Sorry, didn’t realise! Have rattached to the OP much smaller.
 

paul1598419

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That's better. It looks like a buck driver to me. Since it isn't adjustable, it could be set for most any current. That is done with SMD resistors, but if you have a dummy load you can measure it to know for sure. Without more information, that may be your only way.
 

Cyparagon

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Thanks for the resizing demand, Paul. Much better. Now that it's fourteen pixels wide, I can't see a damn thing.

Mr. Sterbs, please read off the letters on the IC and I can probably tell you all about it, including the current setpoint.
 
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Benm

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Possibly - there seems to be a number on the chip, but it can't read it in this small photo.

If you really need to know i could try to figure it out for you, but i'd need a fairly large (say 1200x1200 pixel) photo taken straight from the top and with enough depth of field to see both the top of the components and the traces on the board.
 

micksterbs

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Thanks for the resizing demand, Paul. Much better. Now that it's fourteen pixels wide, I can't see a damn thing.

Mr. Sterbs, please read off the letters on the IC and I can probably tell you all about it, including the current setpoint.
Thank you! Sorry for the delay.

Lettering reads:

YB1682
1148
10B410.1
 

lasersbee

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OMG, you need to resize these as they are too large for anything around here. I'm sure one of us has seen this before, once I can see it well enough.
Looks like you need to get a
bigger screen Paul.... :whistle:
:crackup: ;)

@micksterbs

The default image size to use on the
forum is 800 X 600 Pixels.


Jerry
 
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paul1598419

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I guess. Mine is only 17.3 inches. The old images were larger than my screen. :tinfoil:
 

Cyparagon

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Well, the datasheet says it's a 2A buck regulator with a feedback voltage of 1.222V. That doesn't make sense with the 120mΩ shunt though. The other common feedback voltage would put it nearer to 1.8A, but it certainly isn't above 2A with that teeny inductor.
 

Benm

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I'm not sure the R120 is actually the current set resistor though - photos lack the detail to trace it out to the feedback pin or anything else.

I assume the chip is http://www.yobon.com.tw/pdf/YB1682 Rev.1.0.pdf based on the markings stated, but without a view of the complete circuit it's hard to tell what's going on here.

I agree it's doubtful that this is pushing anything in the order of 2 amps with that small inductor, although the chip itself is capable of it.
 

paul1598419

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I don't understand why the OP doesn't just connect it to a dummy load and measure the dang thing. If I had it here, I would have already done that and this whole thread would be pointless.
 

micksterbs

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I don't understand why the OP doesn't just connect it to a dummy load and measure the dang thing. If I had it here, I would have already done that and this whole thread would be pointless.
I feel your pain.

Sadly though, the OP is in the middle of moving house and can’t get at his kit.
 

micksterbs

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Well, the datasheet says it's a 2A buck regulator with a feedback voltage of 1.222V. That doesn't make sense with the 120mΩ shunt though. The other common feedback voltage would put it nearer to 1.8A, but it certainly isn't above 2A with that teeny inductor.
I'm not sure the R120 is actually the current set resistor though - photos lack the detail to trace it out to the feedback pin or anything else.

I assume the chip is http://www.yobon.com.tw/pdf/YB1682 Rev.1.0.pdf based on the markings stated, but without a view of the complete circuit it's hard to tell what's going on here.

I agree it's doubtful that this is pushing anything in the order of 2 amps with that small inductor, although the chip itself is capable of it.

Thank you both very much, this is fascinating info for a novice.

I wish I could remember where i bought the bloody things.
 
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paul1598419

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If you are in the midst of moving, you can't use it right now anyway. Once you get moved and can get your "kit" then you will have need to know what current it is set for.
 
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micksterbs

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If you are in the midst of moving, you can't use it right now anyway. Once you get moved and can get your "kit" then you will have need to know what current it is set for.
Thanks for explaining how that might work.

You know, I asked because I thought someone might just know what it was, you know, recognise it, like “Oh that’s a blah blah 2000”. I didn’t ask anyone to analyse the sodding chip, they kindly offered, and I was interested in their replies. If you find the thread pointless why don’t you piss off out of it? You’re not being helpful.
 




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