Position of current sense IC in output of DCDC converter?

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Hi,

We have a DCDC module generally giving a 48V, 6.5A output. We wish to clamp the output current to approximately 7A so have a current sensor in the output, which feeds an external error amplifier. (as in the attached schematics)

Our contractor wants to put the current sensor upstream of the bulk of the output capacitance, as in schematic A….but we believe that we should have it the other way round, as in schematic B (ie downstream of the bulk of the output capacitance) …do you agree with us?

 

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These 4 scope shots (two from circuit A of top post, and two from circuit B of top post), show how circuit B appears more stable when on constant load.
There is a scope shot of current_sensor_output and SMPS_output_on_AC_coupled for A and B cases.
I made the external current clamp fix the current to 2.53A in both cases, A and B.
The load is 15R.
Vin is 31V
As you can see, in the “A” case, there is a disturbance in the VIOUT signal of the ACS722 current sensor IC that is not there with the B case.
This is not expected. Do you know why “A” appears better than “B”?