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TPS3850-Q1: DFA for TPS3850

Weicheng Li
Intellectual 375 points
Part Number: TPS3850-Q1
Other Parts Discussed in Thread: TPS3850,

Hi TI expert

Can you provide your proposals regarding the CCF analysis between voltage monitoring and WWD under the fact that no DFA is available from TI side.

 

We must demonstrate there is enough isolation between voltage monitoring and WWD from TPS3850 to fulfill the ASIL-B system safety requirements.

OR can you recommend if there is another P2P compatible ASIL-B IC to replace this tps3850 with same voltage monitoring and WWD?

Thanks in advance!

BR

Weicheng

  • 0
    TI__Genius 11780 points

    Hi Weicheng,

    The TPS3850-Q1 has functional safety information provided under the technical documentation tab of the product folder, https://www.ti.com/product/TPS3850-Q1#order-quality. This information has FIT rate and failure mode distribution values that are needed to perform a system level ASIL-B calculation.

    I have also followed up over email regarding a hardware level ASIL-B device.

    Thanks,
    Joshua

  • 0 in reply to Joshua Garcia
    Intellectual 375 points

    Hi Joshua

    Thanks for your quick response, checked all papers from your website, it is not enough to support ASIL-B system, and not able to demonstrate tps3850 is capable for ASIL-B application, as No DFA and FMEDA to showcase the proper mechanism which can support independent of voltage monitoring and WWD, latent fault metric as well.

    can you pls priority this topic internally, to support us demonstrate this device is capable of support ASIL-B system ?

    Thank you!

    BR

    Weicheng

  • 0 in reply to Weicheng Li
    TI__Genius 11780 points

    Hi Weicheng,

    We do not have DFA and FMEDA documents for the TPS3850-Q1 device because it is not a hardware capable ASIL device. As you have mentioned it can be used in a system to reach system level ASIL-B but that will require independent overall system FIT calculation using the already provided functional safety information.

    Thanks,
    Joshua