I hope this message finds you well. I am currently working on a 90V power supply design and would like to ensure that it meets the necessary EMI and EMC standards. Given the importance of these aspects for compliance and optimal performance, I am seeking feedback from the community to verify my design and suggest any potential improvements.
I would appreciate it if any members could review my design and provide insights on possible improvements to minimize electromagnetic interference and ensure electromagnetic compatibility. If needed, I can share the schematics and layout for further review.
Thank you in advance for your valuable time and expertise. I look forward to your feedback.
I have reviewed your schematic and see no issues with the way you have made your connections. I can see that you have followed the datasheet well. A few general recommendations such that operation will be as stable as possible which is also mentioned in the datasheet:
The average voltage on the FB pin is 200mV, so be sure this is accounted for in your calculations to be regulated for your output voltage.
Be sure that your input decoupling capacitors are placed as close to the VIN pin as possible. This should be done to minimize the possibility of switching spikes.
Be sure that output capacitors are placed as close to GND as possible. Use the exposed pad to GND for the best thermal performance for this IC. This decreases any loops that would inadvertently act as antennas.
Here are some more tips that would be beneficial to you as well that were not outlined in the datasheet that are certainly beneficial to reducing EMI:
Use a shielded inductor as they have better EMI performance
Avoid cutting your ground plane under any high current path.
Be sure to add a ground plane in board layout reduces EMI (as you probably already know)
Hi Krishna sir,
Thank you so much for the reply in details. I need your more guidance in this matter. Can we connect over the mail or teams and Google Meet mail ID ashutamar0@gmail.com?
For more in-depth support, I can connect you with engineers that can help you with non-public support. Through this we can officially set up a meeting and provide the support. Please submit a ticket using the following link: MPS NOW Remote Support - Support (monolithicpower.com)
Unless you are okay with asking for help through this forum, then I can support you here.
