T
treez
Guest
Hello,
Is there such thing as a scalpel whose blade can be connected to earth? This would hopefully stop the ESD damage that we sometimes get when we cut through PCB copper next to a power controller IC.
We have a common mode noise problem on our LED Power supply PCB due to the switching node copper of our 1W LNK302 based Buck converter being spread in wide area over the bottom of the PCB, next to the earthed heatsink. (only a thin thermal pad betwixt the two).
Therefore, we are cutting (with scalpel) through the copper on the top layer, so as to detach the bottom layer switching-node copper from the switching node. This involves a lot of “sawing” with a scalpel, and the “rubbing” action involved is damaging some of the LNK302 chips (via ESD) and making them malfunction (give too high overvoltage on output).
Is there such thing as a scalpel whose blade can be connected to earth? This would hopefully stop the ESD damage.
(we have 500 populated PCBs that need this scalpel cutting)
LNK302 datasheet:
https://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf
Is there such thing as a scalpel whose blade can be connected to earth? This would hopefully stop the ESD damage that we sometimes get when we cut through PCB copper next to a power controller IC.
We have a common mode noise problem on our LED Power supply PCB due to the switching node copper of our 1W LNK302 based Buck converter being spread in wide area over the bottom of the PCB, next to the earthed heatsink. (only a thin thermal pad betwixt the two).
Therefore, we are cutting (with scalpel) through the copper on the top layer, so as to detach the bottom layer switching-node copper from the switching node. This involves a lot of “sawing” with a scalpel, and the “rubbing” action involved is damaging some of the LNK302 chips (via ESD) and making them malfunction (give too high overvoltage on output).
Is there such thing as a scalpel whose blade can be connected to earth? This would hopefully stop the ESD damage.
(we have 500 populated PCBs that need this scalpel cutting)
LNK302 datasheet:
https://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf