• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 271 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.

TPS54610: negative voltage risks of TPS54610

Frank Xiao
Genius 12055 points
Part Number: TPS54610

HI TEAM,

My customer is using the TPS54610 now. When we test the PH waveform, we find two information want to check with you.

From the datasheet, the DC negative voltage is -0.6v, the 10ns negative voltage is -2v(whether it means the device can survive from -2v 10ns?)

1. whether the negative voltage has risks?(From my opinion, it's ok)

2. you can see the internal body diode voltage drop is above -0.6v which is the DC AB MAX value. Not sure whether we can change the AB max table based on the real internal body diode voltage drop? Or how we can judge and give the -0.6 here?

 

 

 

 

  • 0
    TI__Genius 14856 points

    Hello Frank,

    This is a common question for Buck converters.

    You could have a good read looking at the following App Note: https://www.ti.com/lit/an/slva494a/slva494a.pdf?ts=1593700645984

    Abs Max refer to maximum voltage that can be applied to SW when not in operation. 

    During switching operation, the negative rating is exceeded due to the operating principles of a synchronous buck converter. The Bode diode of the low-side MOSFET will be conducting for a small amount of time between ON and OFF state. This does not violate the absolute maximum rating, because the current causing the voltage excursion is applied by the output inductor during switching operation.


    So, behavior you are seeing is not a problem, this is normal operation of the device.

    Let me know if you have any other questions.

    Thanks a lot!

    Regards,

    Dorian

  • 0 in reply to Dorian Brillet de Cande
    TI__Genius 14856 points

    Hello Frank,

    I haven't heard back from you. Was I able to help you there?

    Do you have any further questions on this device?
    Let me know.

    Thanks a lot!

    Best Regards,
    Dorian