• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 464 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.

Original question:

LM5145: SS/TR pin voltage

LM5145: OVP and Hiccup

Wendy Wang1
Genius 16840 points
Part Number: LM5145

Hi!

 

Currently, I’m testing the LM5145EVM.  I test the cycle by cycle OVP and the hiccup. I’m really curious about why we should use a cycle by cycle OCP and hiccup. If we only use the hiccup, without the cycle-by-cycle OVP, what will happen? And If there is not hiccup,  the device directly stops working. What is the disadvantages?

 

  • 0
    TI__Mastermind 39980 points

    Hello Wenxiu,

    The LM5145 employs a cycle by cycle current limit.  If after 128 consecutive cycles occur, the device will enter into a hiccup mode protection.  Hiccup mode improves reliability because without it would cause the converter to continuous delivering high current levels to the load.  This can cause excessive power dissipation in this mode.

    If you were to implement hiccup only without cycle by cycle OCP, this can cause false triggers with the output being interrupted needlessly as a result.

    Hope this helps?

  • 0 in reply to David Baba
    TI__Genius 16840 points

    Hello David,

    Thank you for your prompt reply! It helps me a lot!

    Best regards,

    Wenxiu