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CSD97394Q4M: cannot pass RADIATED EMISSION test

Jesse Lee
Expert 1985 points

Part Number: CSD97394Q4M

hello常规cigarjak9v.pdf

we use CSD97394Q4M in wireless charger-TX product which can support Apple 7.5W fast charge.

Now our wireless charger cannot pass RADIATED EMISSION test for KC mark (Korea certification).

Detail result is in the enclosed file.  Please refer to it!

Please provide some suggestions on it ASAP!

Thanks a lot!

  • 0
    TI__Mastermind 24075 points

    Hi Jesse, 

    Can you use RC snubber on switching node and boot resistor to reduce the voltage spike and ringing on switching node?

    Thanks

    Qian

  • 0
    TI__Intellectual 800 points

    Jesse,

    Your test result shows radiated emission peak above the standard limit at 180-200MHz frequency. For the wireless charger to pass the Radiated emission test, please use with CSD97394Q4M the following components :

    -Boot R:  start with 2.2ohm and you may increase it up to 10ohm until switch-node peak gets below 20V

    -Snubber C=2.2nF/0402/50V/X7R

    -Snubber R=1ohm/0805

    Best regards,

    Lucian