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Excita
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Sorry, Im not Russian so I try it in English.
I have a broken qnap ya-119p ii nas with a damaged 8-pin dc-dc converter I guess.
The marking is ABP0NB or ABPONB. Someone knows what this is???
Regards
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roges
Передовик
Сообщения: 1197
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| Excita, shall describe the alleged pinout |
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Excita
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Hi,
I tryed to Write Out The schematic diagram.
Seems to be as followed:
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roges
Передовик
Сообщения: 1197
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Hi!
Did you make a mistake, and the scheme looks like this ...!?
See 3A, 12V, Synchronous-Rectified Buck Converter -
with similar pin connections.
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AOZ1010
AOZ1021
APW7142 |
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Excita
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Yes, capacitor in parallel with resistor connects to outlet.
The Single cap is correct, between pin 5 and pin 7.
Curious you cant identify The device via The marking code.
Maybe i have to try on of The examples youve named.
Best Regards |
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roges
Передовик
Сообщения: 1197
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Excita,
Judging because the board is present, Step Down Regulator -SY8009B,
we can assume that the element with the code "ABP0NB" too, belongs Silergy Corp.
Especially because they practice six figure encoding Package SO-8.
However, this is only a guess, because the manufacturer is stingy on the documentation. 
Therefore, in the theme options have been proposed functional analogs with similar pin connections.
| roges писал: | AOZ1010
AOZ1021
APW7142 |
It remains to determine the output voltage of the regulator.
To do this, you need to know the resistor values in the circuit FB, though, and so it is clear that it should not exceed the maximum input voltage for SY8009B - 5,5V |
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Excita
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Hi Roges,
thanks for your help.
R1 reads 100.1kOhm
R2 reads 22.1kOhm
Related to the Datasheets, the output voltage should be ~4,45V.
I tryed 3,3V to the output of the Buck and the NAS seems to boot, (LEDs and fan working).
I didnt tryed 4,45V, because for me i never heard of such a voltage in PC related stuff.
Sadly I cant get the SY8142 / SY8143 datasheet or the pinout.
Best regards |
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roges
Передовик
Сообщения: 1197
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Hi Excita !
| Excita писал: | | I didnt tryed 4,45V, because for me i never heard of such a voltage in PC related stuff. |
This should not confuse you. Resistive divider circuit FB, you can select any output voltage of the regulator.
In this case, it is necessary to proceed from an average value of the input voltage SY8009B, which will be 4,25V (+/- 5%)
| Excita писал: | | Sadly I cant get the SY8142 / SY8143 datasheet or the pinout |
Unfortunately, only that there offsayte. |
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Excita
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Well, okay.
I ordered aoz1021 today, should arrive on Thusday.
Hope I can get it back to work. |
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