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TPS552872-Q1: Functional safety related

Ethan Liu
Intellectual 1435 points
Part Number: TPS552872-Q1

Tool/software:

Dear team,

When we use TPS552872-Q1 to perform functional safety related functions, we need to conduct some additional analysis to identify whether there are certain failure modes in the internal or peripheral circuits of the chip that can simultaneously cause out voltage regulation overvoltage and OVP not working.

 

In detail, regarding Internal Design:

Are the reference voltage used for voltage regulation and the reference voltage for overvoltage protection independent?

Is there an internal common cause failure that can simultaneously cause overvoltage and render overvoltage protection ineffective？

 

Regarding peripheral circuits：

From PIN FMA result we see some failure mode may cause device damage. We need to know if there will be an output overvoltage in this situation?

Is there an peripheral circuit common cause failure that can simultaneously cause overvoltage and render overvoltage protection ineffective？

Best regards

Ethan

  • 0
    TI__Mastermind 27810 points

    Hi Ethan,

    Thanks for reaching out.

    I will look into this and reply to you later today.

    BRs,

    Bryce

  • 0 in reply to Bryce Xun
    TI__Intellectual 1435 points

    Thanks Bryce, Hope to receive your feedback soon!

  • 0 in reply to Ethan Liu
    TI__Mastermind 27810 points

    Hi Ethan,

    Sorry for late, please see my replies below.

    1. Regarding Internal Design:

    (1) Are the reference voltage used for voltage regulation and the reference voltage for overvoltage protection independent?

    -> Not independent. The reference voltage are both derived from internal bandgap.

    Is there an internal common cause failure that can simultaneously cause overvoltage and render overvoltage protection ineffective？

     -> When the internal bandgap fails, the both reference voltage are not effective.

    2. Regarding peripheral circuits：

    From PIN FMA result we see some failure mode may cause device damage. We need to know if there will be an output overvoltage in this situation?

    -> It needs to be analyzed case by case, not every case would cause output overvoltage.

    Is there an peripheral circuit common cause failure that can simultaneously cause overvoltage and render overvoltage protection ineffective？

    -> When VCC is not stable, the internal reference would also be not effective, and it could happen.

    BRs,

    Bryce