• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 165 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS25854-Q1: Which circuit did you use for "Figure 11-4. 2.1-MHz EMI Results (Without CM Filter)" and "Figure 11-5. 400-KHz EMI Results (Without CM Filter)"

Yoshiki Ochi
Expert 8035 points
Part Number: TPS25854-Q1
Other Parts Discussed in Thread: PMP40960, PMP40939

Hi team, 

Which circuit did you use for "Figure 11-4. 2.1-MHz EMI Results (Without CM Filter)" and "Figure 11-5. 400-KHz EMI Results (Without CM Filter)"

Regards,
Ochi

  • 0
    TI__Mastermind 18556 points

    Hi Ochi-san,

    These two picture come from the PMP40960 and PMP40939 reference design, below are their schematic. And sorry to confuse you, the 2.1MHz reference design, we use the inductor is 1uH, and the 400KHz reference design, we use the inductor is 4.7uH.

    PMP40960:

    PMP40939:

    Best Regards,

    Kuno

  • 0 in reply to Kuno Wu
    TI__Expert 8035 points

    Hi Kuno, 

    Thank you.

    Datasheet "Figure 11-5. 400-KHz EMI Results (Without CM Filter)" says L=10uH, on the other hand, PMP40960 is with L=4.7uH. 

    Could you re-confirm which circuit is used for test result of "Figure 11-5. 400-KHz EMI Results (Without CM Filter)"?

    Regards,
    Ochi 

  • 0 in reply to Yoshiki Ochi
    TI__Mastermind 18556 points

    Hi Ochi-san,

    I have checked this information with my colleague, he said that he indeed use the 4.7uH to have a test. In fact, he had already left TI, so I checked with him on the phone.

    Best Regards,

    Kuno