4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the UCC273x1A-Q1 (SOIC and VSON packages). The failure modes covered in this document include the typical pin-by-pin failure scenarios:

• Pin short-circuited to ground (see Table 4-2 and Table 4-6.)
• Pin open-circuited (see Table 4-3 and Table 4-7)
• Pin short-circuited to an adjacent pin (see Table 4-4 and Table 4-8)
• Pin short-circuited to supply (see Table 4-5 and Table 4-9)

Table 4-2 through Table 4-9 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

• The device operates within the conditions specified in the data sheet.
• For SOIC, the following failure assumptions apply:
  • Short between pin one and pin eight is out of scope.
  • Short between pin four and pin five is out of scope.
  • Short to supply for HI and LI assumes a short to 5V supply.
  • Short to supply for others pins assumes a short to VDD.
• For VSON, the following assumptions apply:
  • Short between pin one and pin ten is out of scope.
  • Short between pin five and pin six is out of scope.
  • Short to supply for HI, LI, and EN assumes a short to 5V supply.
  • Short to supply for others pins assumes a short to VDD.