Other Parts Discussed in Thread: TPS65381A-Q1, TPS65381-Q1
Hello!
I plan to use a Hecules MCU for a functional safety application.
At the same time, I am looking for a PMIC that is supported in your VDE approved software packages.
I have found that TPS65313-Q1 is the best fit in the application.
Is this device TPS65313-Q1 now also included in the Hecules safety libraries?
If not, which alternative device do you propose?
I have looked at the TPS65381AQDAPRQ1 but to make it work in the application I need to add an extra LDO on the pre reg voltage.
This is OK electrically but causes more complications with regard to the MTTFd caluations.
The LDO TLV766-Q1 does not support the same type of functional safety data as provided in the FMEDA for either the Hercules MCU or any of the PMICs.
How do I get the same reference in my calculations if I include an IC that does not have an FMEDA?
The TI video education and SLOA294 – JUNE 2020 gives some insight to the TI process but several questions arises. The values defined by either IEC TR 62380 or SN29500 does not represent my application. Why is this important? The answer is that the use-case has a major effect on the FIT values.
The FIT value in FFS379A – SEPTEMBER 2022 – REVISED MARCH 2023 defined by IEC TR 62380 is set to an automotive use-case with very low active operating time, while the SN29500 is based on another use-case.
On top of this we have the methods by themselves. According to SLOA294 – JUNE 2020 , SN29500 gives a too optimistic value as compared to IEC TR 62380.
Lastly, we also have the so-called technology FIT which gives an even more optimistic FIT value.
To get alinement it would be very good to have a solution based on two IC's (MCU and PMIC) and discreate components.
Please advice.
Best regards Anders
