SFFS422 May   2022

 

  1.   Trademarks
  2.   2
  3. 1Scope
  4. 2Related Documents
  5. 3Related Standards and Acronyms
  6. 4Concept Overview
    1. 4.1 System Block Diagram
    2. 4.2 System Specifications
    3. 4.3 Conditions of use: Assumptions
      1. 4.3.1 Generic Assumptions
      2. 4.3.2 Specific Assumptions
    4. 4.4 Safe Torque Off Implementation
      1. 4.4.1 Subsystem Elements
      2. 4.4.2 STO Safe Subsystem States and Timing Diagram
      3. 4.4.3 STO_1 Subsystem
      4. 4.4.4 STO_2 Subsystem
      5. 4.4.5 MCU (SIL 1) Diagnostic Coverage
      6. 4.4.6 STO_FB Subsystem
      7. 4.4.7 Information on ICs
        1. 4.4.7.1 Isolated 24-V Input Receiver
        2. 4.4.7.2 Load Switch: TPS22919
        3. 4.4.7.3 High-Side Switch: TPS27S100
        4. 4.4.7.4 Isolated Gate Driver: ISO5852S (ISO5452)
    5. 4.5 Safe State
  7. 5Concept FMEA
    1. 5.1 System FMEA
  8. 6References

Generic Assumptions

  • PCB design: The analysis is based on concept and does not include the PCB layout design. The PCB design is out of scope for this analysis
  • Over- and undervoltage protection circuits must be assessed in the implementation of this concept design. Out of the scope of this activity.
  • Diagnostic and any firmware must be assessed in the implementation of this concept design. Out of the scope of this activity.
  • Common cause factors and determination of beta-factor and CCF must be assessed in the implementation of this concept design. Out of the scope of this activity.
  • Quantitative analysis (PFH, MTTFd, and so forth) must be assessed in the implementation of this concept design. Out of the scope of this activity