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February 24, 2013
Product ROB-11876 |
about 2 months ago
I see a few of these have been blown. Looking at the data sheet the equation for max current is I_max = V_ref / (8*R_s).
The board schematic and features list say the current adjust pot will give you 0 to 2.4 Amps.
However, if using the board at 5V logic level I get the max current to be 4.5 amps since you can put a max of 4V on the V_ref pin (unless the adjustment pot is limited) and the R_s resistors are 0.11 ohms. Now I’m sure it can’t actually do 4.5 amps, but it’s definitely allowing it to run completely maxed if not over-run.
On the website the old version 1.1 has R_s values of .22 ohms and you can put up to 4.2V on V_ref. This setup works out to exactly 2.4 amps.
What am I missing? Why the change?
No public wish lists :(