• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 112 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.

TPS65130: damaged TPS65130

Tin Thurein
Prodigy 10 points
Part Number: TPS65130

I have a board using TPS65130 to generate +/-15V from +5.5V input and similar circuit to the one shown in app circuit. A few of TPS65130 have been found to be damaged and checking carefully on the circuit nodes I have found two things.

1. I noticed that sometimes the input of 5.5V can sometimes exceeds by as much as 200mV on some boards and am wondering if there is negative impact to the lifetime of the part or any other major concerns as the datasheet states operating max of 5.5V and could be the culprit to damaged TPS65130.

2. I followed the recommended app circuit from the datasheet and the app notes mention that R7 can be replaced with ferrite bead. I am a bit unclear if replacing R7 with ferrite bead could or could not improve the reliability of TPS65130 and if this is related to the issues I observed.

Thanks!

  • 0
    TI__Mastermind 27140 points

    Hi Tin,

    1. TPS65130 VIN pin can tolerate max 6V, so this voltage spike seems okay, though it might influence the lifecycle of the IC since it has over the recommended voltage 5.5V.

    2. Was the damage related to VIN pin? The ferrite bead is more likely to reduce the high frequency noise. I think we need to figure out the root cause of this damage and then optimize the components or anything else.

    So I have some questions for you:

    1. Have you found any pins short to GND of TPS65130 after damage?

    2. And may I know what is your application, is it an LCD display? If so, could you please share me with the current load on each output rail?

    BR

    Patrick