Hi Team,
My customer is design with LM25017, input is 24V, and output is 9V for powering the RS485. The SCH can seen as below.
The only loading part is the 9V output, and there no loading on the VDD output.
The input 24V is from a RC powering as below:
Based on this design, the transmitting noise should be filtered by the L1 and L2.
Now the CE issue is that:
If the 9V for RS485 output is connecting to the RS485 device with a long routine, the LM25017 design' CE signal would exceeded the requirement.
As you can see as below, the CE's failure happened in the harmonic frequency which below 1MHz:
So we'd like to learn is there any issue with the LM25017's SCH design ,especially for those R, C values.
If not, how could we solve this problem?
Please feel free to let me know if any comment! Thanks!