Hello!

I'm trying to redesign Rev. C of the µSupply for myself to get more current out of it (3A), therefore I'll use the LT3083, maybe 2 of them in parallel.

It should be powered by 24V DC, so I'll place a DC/DC preregulator instead of the battery powered solution.

To get a more exact current measurement, I plan to use the INA219 in the circuit but I'll remove one of the 10Ohm resistors (R1) and replace it by a 1Ohm resistor in series with 2x10Ohm resistors in parallel. So the total shunt resistance for the opamps there will be still 1 Ohm but I get the possibility to get 1/10 of the voltage over the current shunt to measure by the INA219. Together with /8 measurement this will give me up to 3,2A total measurement range on the INA219. Of cause I take care about the power dissipation in the shunt resistors.

To get 3A out it is also necessary to change the voltage divider R25/R36. At it's output there should be 3,072mV to get 1mA/bit out of the 3,3V PWM signal.

To keep the different parts low I came out with the following values: R25=11k (10k+1k), R36=150k, resulting in only 0,08% error for the divider, the tolerance of the resistors is much higher. If only one 10k resistor for R25 is used, the error would be 0,71%.

Any other issues to deal with, when I try to get 3A out of the supply?