• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 38 subscribers
  • Views 426 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS54361EMC design

Meng jeffrey
Expert 2760 points

24V power is being reviewed and applied to ADAS:TPS54361QDPR. Please check the loop diagram in the attachment, especially the EMC design (radiation, conduction) and the selection of the parts. If there is a difference, please give a detailed explanation and give the countermeasures. Thank you.

  • 0
    TI__Expert 6245 points
    Hello Meng,

    I assume that you want to pass CISPER 25 class 5.

    Filter:

    You need more impedance in your input filter, ~ 100 Ohm bead rather than a 22 Ohm bead. You also need about 3 X the input cap - Vdd in your schematic. Please use the filter designer in Webench to get a better combination. My calculations show trouble in the CB and TV bands if not modified.

    SW node:

    Common mode noise is very sensitive to layout. You need a layout review to look at EMI.

    I calculate that you will likely need one of the following: a snubber, a shield, or common mode choke. You need about 6 dB in the TV and FM bands. The shield should just work. The snubber will take some fine tuning if used. The common mode choke should be approximately 5 uH. Combining the common mode choke and snubber is a good idea. Neither of these is needed if a shield over the SW node is used.