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

Table 1-1 Revision History
Revision Date Name Change
1.2 2018/10/25 Navaneeth Kumar N (TI), Anant Kamath (TI) Version shared with TUEV SUED for feedback. Refer to “Review Protocol_Concept V1.0.docx”
1.3 2021/08/04 M. Staebler (TI)

Changed format to according to TUEV template, added additional references, added further info on conditions of use/assumptions and STO_1 and STO_2 subsystems. Adjusted MCU signal names on schematics to reflect input or output signal w/ MCU.

Added info on reinforced isolated gate driver ISO5852S, and pin-compatible ISO5452.
1.4 2021/09/23 M. Staebler (TI) Updated conditions of use, removed the STO latching feature, added table to explain U7 load switch QOD.
1.5 2021/09/29 M. Staebler (TI) Updated figure 3 which shows STO_1 subsystem (added second transistor Q3 for redundant VCC clamp), added reference to IEC 615008-2 table A DC fault model. Updated figure 4 to match the schematics rev E2
1.6. 2021/11/11

M. Staebler,

C. Gao (TI)

 Added STO_FB channel, updated block diagram, added description of STO-FB logic and updated system FMEA and references. Modified file name to include STO.
1.6a 2022/01/31 M. Staebler (TI) No change in content, corrected typos only.
1.6b 2022/05/18 M. Staebler (TI) Correction to FMEA STO Concept TIDA-01599 secure link