Electronics > Repair
What part number is this transformer?
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wasedadoc:
3 windings is fairly common. The one on the right is the output feeding the diode D11 just below it and then into the electrolytic. The winding at the bottom is probably the input side and connected to the Q10 transistor/FET. The winding at the top would be feedback to make it oscillate.
kff:
Update: I ended up using Coilcraft DA2320 in place of the blown transformer. The pinout of that transformer is very different, so I made a tiny adapter PCB that sits between the BMS board and the transformer.

Another possibility is P0926NL from Pulse Electronics, although I haven't tried it.

DA2320 is not a perfect (or even a close) match, and one of the rails now reads 11.5V instead of the 8V indicated on the silkscreen. That doesn't seem to matter, as there is a voltage regulator to generate the needed 3.3V, and current consumption is pretty low to worry about efficiency.

I've charged / discharged the battery a few times after replacing the transformer and so far all is good.

Hope someone will find this info helpful.
Te:
Hi,

I have replicated your transformer repair on one of my Gen3 EGO battery BMS boards, however instead of using the DA2320, I used the DA2317 (with a 2:1:1 ratio) as I though the transformer may have been a 2:1 instead of 1:1 based on resistance measurements.  However, I still see the same 11V output on one of the rails like your repair.  Was a tricky soldering job given the different topology of the pinout. I also searched for a few hours for a transformer with the matching topology.

Is your battery still functioning?  Mine charged correctly after the repair.

Thanks!
raymond008:
I have the exact same issue with my 7.5ah battery packs. Both failed for this transformer on the exact winding.
How does the DA2320 or DA2317 works out? Also, please provide the pin mapping if you could. Greatly appreciated.

raymond008:
I ended up fixing the transformer instead of replacing it.
The top winding turns out to be the outside winding of the transformer. I use hot air gun to disassemble the ferrite core and rewind
the outside winding and properly soldered the broken wire back. The breakage usually either at the beginning or at the end.
You may ended up just loosing 1 round of wire. I think it will match the original spec better a replacement transformer.
For those who may need to rewind it from scratch if the wire break in the middle, the outside winding is of 0.1mm diameter (38 AWG) and 24 inches long.
My repair was a success and the BMS works again.
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