SFFS309A April   2022  – May 2022 TPS3704 , TPS3704-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Hardware Component Failure Modes Effects and Diagnostics Analysis (FMEDA)
    1. 2.1 Random Fault Estimation
      1. 2.1.1 Fault Rate Estimation Theory for Packaging
      2. 2.1.2 Fault Estimation Theory for Silicon Permanent Faults
      3. 2.1.3 Fault Estimation Theory for Silicon Transient Faults
      4. 2.1.4 The Classification of Failure Categories and Calculation
    2. 2.2 Using the FMEDA Spreadsheet Tool
      1. 2.2.1 Mission Profile Tailoring Tab
        1. 2.2.1.1 Confidence Level
        2. 2.2.1.2 Geographical Location
        3. 2.2.1.3 Life Cycle
        4. 2.2.1.4 Use Case Thermal Management Control (Theta-Ja) and Use Case Power
        5. 2.2.1.5 Safe vs Non-Safe (Safe Fail Fraction) for Each Component Type
        6. 2.2.1.6 Analog FIT Distribution Method
        7. 2.2.1.7 Operational Profile
      2. 2.2.2 Pin Level Tailoring Tab
      3. 2.2.3 Function and Diag Tailoring Tab
      4. 2.2.4 Diagnostic Coverage Tab
      5. 2.2.5 Customer Defined Diagnostics Tab
      6. 2.2.6 Totals - ISO26262 Tab
      7. 2.2.7 Details - ISO26262 Tab
      8. 2.2.8 Totals - IEC61508 Tab
      9. 2.2.9 Details - IEC61508 Tab
    3. 2.3 Example Calculation of Metrics
      1. 2.3.1 Assumptions of Use for Calculation of Safety Metrics
      2. 2.3.2 Summary of ISO 26262 Safety Metrics at Device Level
      3. 2.3.3 Summary of IEC 61508 Safety Metrics at Device Level
  4. 3Revision History

2.3.3 Summary of IEC 61508 Safety Metrics at Device Level

Table 2-4 provide estimates of FIT rates and calculated safety metrics per IEC 61508-2:2010 using previously noted assumptions for the device.

Note:

IEC 61508 beta factor is not included in these calculations as there is no hardware fault tolerance claimed.

Table 2-4 TPS3704x-Q1 - IEC 61508 FIT Rate Estimates and Safety Metrics for the Device
DiePackageOverall
PermanentTransientPermanentSum
Total FIT (Raw FIT)λ

1.22

0.00

1.77

3.00

Safety Related FITλSR

0.87

0.00

1.61

2.48

Probability of Hardware Failures (in FIT)PFH

0.42

0.00

1.09

1.51

Safe Failure FractionSFF

51.32%

0.00%

32.14%

38.86%
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