Tool/software:
I am encountering an EMC radiated issue related to the LCD board of our device. The board has two switching regulators: a TPSM82903SISR, which converts 12V to 5V, and a TPS65150PWP, which generates the LCD voltages for VGH (18V), VGL (-6V), and AVDD (9V). Additionally, there is a TPS61169DCKR LED driver for the backlight, with the backlight LED operating at 17.5V and 290mA.
The LCD data is transferred via LVDS at 51.2 MHz through the DS90LV804TSQX. I have attached the EMC graphs, but I'm unsure if the frequencies exceeding the limits are coming from the switching regulators or are caused by the LVDS interface.
I've also attached the layout and schematic of the regulators for reference. The layout is constrained by mechanical restrictions, resulting in the inductors being placed farther from the regulators than ideal.
Could anyone provide insight into whether the switching regulators or the LVDS are contributing to the EMC issue and suggest possible solutions?
This is the test result without any Cu tape on the PCB.
And this is the test result when the regulators are covered by Cu Tape.
