Anyone tried to beef up these "BST900"?
I will be trying to get it working on at least 500W output with 12V server power supply charging 20s Li-ion. I was experimenting and testing a bit and found that I would need much bigger inductor. With the stock one I manage to get only about 13 Amps on the input no matter what I do with the output or with the shunts
Very disappointing knowing that I have 70A on 12V...
So I tried putting 2 additional random inductors that I had in series with the stock one. It started to get quite noisy, but I manage to pull about 18 Amps on the input. The good thing is that it is not limited in current by the chip, but only the power components.
So my goal is to achieve at least 50A input and I think I would only have to do these several things:
- mount the mosfet on a CPU sink
- replace the STPS30150C with STPS80170CW
- make a huge new inductor and probably mount it under
- replace the 20A fuse
- beef up the traces
- maybe add more capacitance on the input and output?