Hi engineers,
There is a EMI problem from customer which occur in a 12V to 5V step-down application based on LMR14020, this circuit works fine.
Background:
they encountered an EMI problem that 3dB exceed at the 330KHZ frequency point(Disconnect load) and they are currently in small batch production, So PCB layout are fixed.
Question:
1.Are there any ways to improve EMI performance without changing the layout ?
2.If they are willing to modify PCB layout, what needs to be modified in their current layout and why?
The test results show as below:
the schematic diagram show as below:
The PCB layout show as below: