Post
Topic
Board Development & Technical Discussion
Re: Modular FPGA Miner Hardware Design Development
by
fizzisist
on 11/08/2011, 16:25:24 UTC
[...] Did Olaf change the feedback resistors to the suggested ones in the power supply datasheet? [...]

Not yet. I also wanted to incorporate the suggestion by TheSeven to increase the 1.2V rail to 1.26V, and I haven't thought about how to find the closest matching resistor values for a given ratio.

Just looked back a couple of pages, and TheSeven actually suggested 1.25V, because 1.26 is the max allowed. For that, R_FBT = 1.07k and R_FBB=1.87k gives 1.24989V.

Also, the question of resistor tolerance came up a while back. With this combination and 1% resistors, the worst cases give 1.2591 and 1.2409, which I think is sufficient.

I made the change to the schematic in your folder, and updated the BOM database with those resistor values.