• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 1191 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.

TPS61165: Could you tell me about "LED driver without ringing"?

Pokkun
Genius 4695 points
Part Number: TPS61165

Hi team.

My customers are considering on the assumption that TPS61165.

However, since TPS61165 is an asynchronous rectification method,

Ringing as shown in the figure below occurs and it becomes a noise source,

so customers are looking for something that does not Ringing.

I myself looked for a synchronous rectifying boost LED driver that matched the specifications below but could not find a conforming product.

So, if you know, can you tell me about conforming products?

Also, in the absence of conforming products, is there a technique to drive the LED using a normal synchronous boost converter?

Best regards,

Pokkun (Masumi Sekiguchi)

  • 0
    TI__Expert 4550 points
    Hi Masumi,
    When the Boost converter operates in DCM mode, I'm afraid we can't eliminating this ringing with TPS61165.
    With a synchronous boost converter, the ringing is still there in DCM mode. And I see the output voltage is around 20V, usually the benifit of a synchronous boost, which is efficiency, is not that remarkable at this output voltage level, a schottky diode is enough. Why the customer wants that?

    Best regards
    Caryss
  • 0 in reply to Caryss Li
    Genius 4695 points

    Thank you for your answer.

    The concern of this Ringing is because of that "that may become a Noise source."

    Therefore,
    if we can propose either "Proposing a replacement another device that will not be in discontinuous mode" or "adjust to suppress ringing with peripheral circuit (resistance / capacitor)",Customers are likely to consider TI products as they are.
    ※For the replacement another device that will not be in discontinuous mode,
    I searched for a synchronous rectification type device, but it is the present situation that did not exist.


    So, I must propose something at all costs.

    Could you advise me?

  • 0 in reply to Pokkun
    TI__Expert 4550 points
    I'm afraid we don't have such device either not ringing or synchronous. Actually the ringing enegey is quite low, should be low risk.

    Caryss.