SLVAFI8 February 2023 TLC6C5748-Q1
As shared previously, R-C or FB-C filters can be used to dump the high frequency harmonics. The recommendation is to place the R-C filters on the system board. Another filter on LED board is also recommended to have more attenuation, and the filter needs to be placed as close as possible to the connectors.
Besides the general PCB layout guidelines on TLC6C5748-Q1, it is also important to provide a low impedance return path for the signal traces. An integrated and continuous GND plane might not be easy for 2-layer PCB board, but it needs to be done as much as possible. For the signal traces, GSCLK, SIN, SCLK should be placed on the bottom layer only. It’s better not to use vias on these traces. While the signal traces are parallel, evenly spaced vias need to be put between them to have the GND plane integrated.
#FIG_Q5X_YW4_FWB shows the reference layout bottom layer (blue) and top layer (red).