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Yes, but its sole purpose is to work with C4 to rolloff the feedback at higher frequencies, to improve the loop stability and reduce the chance of circuit oscillations.Is r9 a feedback resistor?
I believe you mean AC feedback.R9 is in the circuit to increase the impedance of the DC feedback
No, I meant the DC feedback. Increasing the impedance of the DC feedback allows the AC feedback to have a similar impedance at the chosen cross-over frequency.I believe you mean AC feedback.
C6 is on the wrong side of R9 for that.R9 & C6 form a low pass filter LPF to attenuate noise and reduce the slew rate of the loop from the 1 Ohm current sense resistor.
C4, That's what I meant.C6 is on the wrong side of R9 for that.
R9 & C4 form an LPF for the current feedback from the 1 Ohm resistor. C4 & R9 also form a high pass filter from the op-amp output so that fast feedback Lee the circuit from oscillating.