Yes, you can implement the remote sensing using EN63A0 or any other Enpirion's regulator as shown below.
1/ For the Vsense pin, we don't use it because we don't need the prebias feature, is it a problem?
2/ By connecting the Ra branch at the load point, how can I avoid any stability issue? Perhaps, using your stability tool anf adding trace RES and trace IND is sufficient but what about the parasitic capacitor of the trace?
No need to connect the VSENSE in your case since you don't use the pre-bias feature.
I only include that in my recommendation to make it general answer for any of Enpirion regulators.
Regarding the stability concern, based on the analysis that we did there is no worries in that connection where the control loop will not be effected.
Unfortunately the stability tool is not suitable for that analysis even if it shows that your system is stable where it always has Ra and Ca branches connected together at the same point and you can't separate them.
So i have attached EN63A0 LTSPICE (free spice tool from Analog devices, please click here to download) which will help you to do that analysis in time domain.
Thanks, I'll make analisys based on simulation but is it possible to have a Pspice model because we are used to Pspice from Cadence and encrypted model from LTspice are not compatible.
I have some issue running simulation with EN63A0. Running your test schematic, result are like image below :
If I replace input and output capacitors by ideal one (i.e. without ESL and ESR), simulation doesn't converge.
Could you help me please?
Final goal is to make stability simulation with long feedback track.
We don't recommend to use the ideal values but if you are facing Ltspice converge issue please adjust your LTSPICE setting as shown below.
Regarding the stability simulation, i have updated the circuit to add AC analysis and the simulation result as below. you can adjust the circuit based on your actual component values
Attached also is the simulation circuit with all the log and raw files, so you can have all same resulting and results as mine.
We use 3 EN63A0 in parallel. About the stability, do we need to add all capacitors on the Vout on the simulation or just total number of capacitors divied by 3?