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TPS40170-Q1: Failed EMC test (CE voltage)

Jeffrey Chung1
Expert 2645 points
Part Number: TPS40170-Q1

Hi TI Team,

The EMC test of CE voltage has been failed on my customer's board using TPS40170-Q1. Are there any points to resolve and improve this issue? Please check an attached file and let me know that.

TPS40170QRGYRQ1_Failed EMC test.pdf

Regards,

  • 0
    TI__Mastermind 48941 points

    Hello Jeffrey 

    I guess you need a dramatic change to pass the CE test since 5Ω gate resistor is still not enough... Please consider these items. 

    • Add input filter, especially add a bead. Also, populate the additional input capacitor in the range of 10nF to 100nF at the input terminal.   
    • Optimize snubber. 
    • Re-design PCB layout and make the switching loop as small as possible. 
    • Use higher Qg, but lower Rdson MOSFETs. 

    - Eric Lee

  • 0 in reply to EricLee
    Expert 2645 points

    Hi Eric,

    I appreciate your kind suggestions. Let me check these points with my customer and I will let you know the improvement status or more questions.

    Regards,

  • 0 in reply to Jeffrey Chung1
    TI__Mastermind 48941 points

    Hello Jeffrey

    Also, the SW rising edge ringing can be reduced by populating a Schottky diode in parallel with the low-side MOSFET. 

    - Eric Lee