• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 442 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.

TPS56221 damage after two years?

henry xin
Intellectual 260 points

Other Parts Discussed in Thread: TPS56221

Dear TI engineer,
Dear All,

We produce radar signal board, based on C6000 DSP platform, the power supply chip is DCDC buck converter TPS56221.

When our products worked over a period of time（about two years）,quite a number of the products malfunctions.

The malfunction appears that after a specific section of code is executed on the C6000 DSP,the electric current largen(about 10A) and the voltage fluctuates（about ±100mV） and then the C6000 DSP crashes.

normally,the C6000 DSP and the board will consume more cureent(about 10A) than usual when the section of code is executed ,but the voltage do not fluctuatesand and the C6000 DSP do not crashes.

A temporary solution :replace the TPS56221 on PCB for a new one.

What is the cause of this,please?
What should I do?

Thank very much!

  • 0
    TI__Genius 13700 points
    Hello Henry,

    Without a schematic or scope captures of the issue it is not possible to say for certain what is causing this issue.

    My first guess is that you are running into a stability issue due to the load transient that occurs when the particular section of the C6000 DSP code is executed.

    I would recommend looking over section 8.2.2.13 in the datasheet and then look through this post here and use the Excel calculator tool to determine the proper compensation values to keep your converter stable for worst case load transient and component tolerance variations.

    e2e.ti.com/.../56090
  • 0 in reply to Ryan May
    Intellectual 260 points
    Thanks very much for your reply!
    It is useful for me!