SN6507: Radiated Noise Countermeasures and Higher-than-expected Temperature Rise

Hello,

Thank you for reaching out. 

1. There are not concerns adding a snubber circuit. Please select RC values that are appropriate for the ringing you are seeing. We also have recommend putting the snubber in the secondary side as well, this usually has a little better performance (9.2.2.6 Low-Emissions Designs). Also see How to Reduce Emissions in Push-Pull Isolated Power Supplies (Rev. A) (ti.com) which may be a helpful document as well. 
   1. Also see previous E2E post that is related (+) SN6505 voltage oscillation - Power management forum - Power management - TI E2E support forums
2. The temperature should not be rising that much. But we have recently found that certain transformers can cause the temperature to rise much more than expected. Can you please send more information? In particular a schematic, transformer part number, input voltage and ambient temperature and then we can confirm if such rise is expected.

Best,
Andrew

Hi Andrew,

Thanks for the reply.

Regarding 1. I will give it a try.

Regarding 2. can I email you the schematic and part numbers directly as they are confidential information?

Thanks.

Hello,

We would prefer not sharing direct email through the forum, but you should be able to private message Andrew with this information.

Best,

Michael