SNVAA92 November   2023 LM63625-Q1 , TPS37-Q1 , TPS3703-Q1 , TPS3850-Q1

 

  1.   1
  2.   Abstract
  3. 1Introduction
  4. 2Power Designs for Safety MCUs With Functional Safety Requirements
  5. 3ASIL B Power-Supply Design Example and FMEDA Analysis
    1. 3.1 Functional Safety Requirements
    2. 3.2 Proposed Power Design
    3. 3.3 FMD and Pin FMA
    4. 3.4 LM63625-Q1 and TPS37A-Q1 FMEDA Analysis at the Die Level
    5. 3.5 LM63625-Q1 and TPS37A-Q1 FMEDA Analysis at the Pin Level
      1.      11
    6. 3.6 Total FMEDA Analysis of the LM63625-Q1 and TPS37A-Q1
  6. 4Summary
  7. 5Additional Resources

3.1 Functional Safety Requirements

Use the following functional safety requirements practices when designing with TI devices:

  • Safety requirement: Design an ASIL B-compliant 3.3-V power supply for a safety MCU
  • Safe state: Reset the safety MCU to a safe state upon detection of a power fault
  • Fault-tolerant time interval: 500 ms
  • Feature how to leverage TI’s failure mode distribution (FMD) and pin failure mode analysis (FMA) data in the system’s failure modes, effects, and diagnostic analysis (FMEDA)
  • Prove that a TI Functional Safety-Capable regulator coupled with a supervisor meets ASIL B metrics through FMEDA analysis