Routing sensitive signals under SMPS switching nodes?

[cupoftea]

Hi,
Doing 2kW PFC’d LLC. Two PFC’s and one Half Bridge LLC. Many switching nodes. We have to route sensitive sense and control signals under switching nodes, there’s no choice…..will it be OK as long as we interpose GND or Power plane copper between switching node and sensitive signal? (to give shielding)

 

[dick_freebird]

I wouldn't expect either GND or VIN to be especially quiet
close-in to any converter. How "sensitive" is "sensitive"?
I've been bit real good (like full-chip relayout) by such
things, on-board crosstalk between adjacent pins.

If you have to cross, cross orthogonally. Do not run for
distance in parallel (in-plane or adjacent planes), there
are coupling modes your board tool may not comprehend
(I've seen voltage coupling, and I've seen magnetic from
longitudinal currents spray all over a GPS chip - though
hardly anything is as "clean-needy" as that.

It seems unlikely on its face that there is no cleaner routing
option. Maybe ones that are unappealing for other reasons.