Forgot to track ramp signal back to PFC controller

[Faringdon]

Hi,
Just  designed and layed out a 2Kw PFC’d PSU.
PFC controller is UCC28070A.
I have forgotten to track in the ramp signal back to the PFC controller PCB. I added the ramp producing circuit to the PFC gate drive PCB, but forgot to track the ramp back to the controller.
(The Current sense transformer burden resistors are [now] on the PFC controller PCB)
Do you think it’ll be OK to twisted pair wire  the ramp signal (with ground obviously)  back to the controller…or would you say too much noise would result?
UCC28070A.
https://www.ti.com/lit/ds/symlink/ucc28070a.pdf?ts=1657631997285&ref_url=https%253A%252F%252Fwww.google.com%252F

(The ramp is needed to reduce mains input current distortion. It is only needed near the mains zero crossings, and during light load)

[pardo-bsso]

No.
One maybe.
Many no.


Do your views disagree?

Yours truly.

[Faringdon]

Thanks, I must admit, i do have a capacitor of an RC filter on the CS pin, so it "should" be OK.
But in a 2kW  offline PSU, having signals on a wire (albeit twisted pair) and bringing that wire right to the CS pin of the UCC28070A sends shivers down my spine a little.

Getting the board re-done will cost some £250 incl shipping, and takes maybe up to 3 Weeks.....(i  dont know why, maybe the weight, (5.6kg for five) but it got stuck in customs for a while , even though i eventiually payed the customs fee)..other (smaller) PCBs from China came much quicker.

[Gyro]

It would be unrealistic to expect not to have to do one or more board passes. It is sensible to find and work around (where feasible) as many errors as possible first though.