4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the UCC33010, UCC33010-Q1, UCC33020, UCC33020-Q1, UCC33410, UCC33410-Q1, UCC33420, UCC33420-Q1 (VSON-12 package). The failure modes covered in this document include the typical pin-by-pin failure scenarios:

• Pin short-circuited to ground (see Table 4-2)
• Pin open-circuited (see Table 4-3)
• Pin short-circuited to an adjacent pin (see Table 4-4)
• Pin short-circuited to supply (see Table 4-5)

Table 4-2 through Table 4-5 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:

• Device is configured according to the Typical Application in the Application and Implementation section of the data sheet
• VINP is considered the supply pin for primary-side pins
• GNDP is considered the ground for primary-side pins
• VCC is considered the supply pin for secondary-side pins
• GNDS is considered the ground for secondary-side pins
• Primary-side pins only short to primary-side pins. Secondary side-pins only short to secondary-side pins.