Member Since: February 24, 2013

Country: United States

  • Product ROB-11876 | about 4 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 :(