SLUAAA3A September   2020  – June 2025 UCC2808A-1Q1 , UCC2808A-2Q1

 

  1.   1
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
  6. 5Revision History

3 Failure Mode Distribution (FMD)

The failure mode distribution estimation for UCC2808A-xQ1 in Table 3-1 comes from the combination of common failure modes listed in standards such as IEC 61508 and ISO 26262, the ratio of sub-circuit function size and complexity, and from best engineering judgment.

The failure modes listed in this section reflect random failure events and do not include failures resulting from misuse or overstress.

Table 3-1 Die Failure Modes and Distribution
Die Failure ModesFailure Mode Distribution (%)
OUTA and OUTB stuck low15
OUTA and OUTB pulse width not as expected17
OUTA stuck low9.5
OUTA stuck high9.5
OUTB stuck low9.5
OUTB stuck high9.5
System is unstable 7
No effect 23