SFFS092 March   2021 UCC23313-Q1 , UCC23511-Q1 , UCC23513-Q1

PRODUCTION DATA  

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

4 Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the UCC23511-Q1, UCC23513-Q1, UCC23313-Q1. 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.

Table 4-1 TI Classification of Failure Effects
ClassFailure Effects
APotential device damage that affects functionality
BNo device damage, but loss of functionality
CNo device damage, but performance degradation
DNo device damage, no impact to functionality or performance

Figure 4-1 shows the UCC23511-Q1, UCC23513-Q1, UCC23313-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the UCC23511-Q1, UCC23513-Q1, UCC23313-Q1 data sheet.

GUID-34294FE6-5A5D-4DA9-A4E3-C7A79BA25286-low.gif Figure 4-1 Pin Diagram

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

  • Pin short case No.1 to 6 and 3 to 4 are out of scope.
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
ANODE1VOUT state = L (low state).B
NC (No connect)2No impactD
CATHODE3Possible incorrect VOUT state. The external controller cannot control CATHODE current.B
VEE 4 Shorting to VEE itself. No effect. D
VOUT 5 VOUT state = L. Possible damge to device. A
VCC 6 VOUT state = L with reduced pulled-low strength. B
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
ANODE1VOUT state = L (low state). VOUT does not repond to the external controller command.B
NC (No connect)2No impact.D
CATHODE3VOUT state = L.VOUT does not repond to the external controller command.B
VEE 4 VOUT state = H (high state) with reduced pulled-high drive strength. VOUT does not repond to the external controller command. B
VOUT 5 VOUT is diconnected from the system. B
VCC 6 VOUT state = L with reduced pulled-low strength. B
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class
ANODE1NCNo impact.D
NC (No connect)2CATHODENo impact.D
CATHODE3Not ApplicableNot ApplicableNot Applicable
VEE 4 VOUT VOUT state = L. Possible damge to device. A
VOUT 5 VCC VOUT state = H. Possible damge to device. A
VCC 6 Not Applicable Not Applicable Not Applicable
Table 4-5 Pin FMA for Device Pins Short-Circuited to 5v supply for Pin No.1,2,and 3,and VCC for Pin No. 4,5 and 6.
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
ANODE1The external controller can't command ANODE to CATHODE current via ANODE pin.B
NC (No connect)2No impact.D
CATHODE3VOUT state = L. VOUT does not repond to the external controller command. B
VEE 4 VOUT state = L with reduced pulled-low drive strength B
VOUT 5 VOUT state = H. Possible damge to device. A
VCC 6 Shorting to VCC itself. No effect. D