SFFS192 March 2022 UCC5350-Q1 , UCC5390-Q1
This section provides a Failure Mode Analysis (FMA) for the pins of the UCC5350-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:
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.
| Class | Failure Effects |
|---|---|
| A | Potential device damage that affects functionality |
| B | No device damage, but loss of functionality |
| C | No device damage, but performance degradation |
| D | No device damage, no impact to functionality or performance |
Figure 4-1 shows the UCC5350-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the UCC5350-Q1 data sheet.
Figure 4-2 shows the UCC5390-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the UCC5390-Q1 data sheet.
Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| Vcc1 | 1 | Device is not powered. | D |
| IN+ | 2 | OUT stuck low. | B |
| IN- | 3 | Cross conduction prevention does not work.. | B |
| GND1 | 4 | Short to same potential. No effect. | D |
| Vcc2 | 5 | Seondary side unpowered. | D |
| OUT | 6 | OUT stuck low. Potential damage to OUT driver. | A |
| CLAMP(UCC5350-Q1) | 7 | CLAMP stuck low. Potentail damage to OUT and CLAMP driver. | A |
| GND2 (UCC5390-Q1) | 7 | Short to same potentail. No effect. | D |
| VEE2 | 8 | Short to same potential. No effect. | D |
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| Vcc1 | 1 | Device is unpowered. | D |
| IN+ | 2 | OUT stuck low. | B |
| IN- | 3 | OUT stuck low | B |
| GND1 | 4 | Device is unpowered. | D |
| Vcc2 | 5 | Device is unpowered. | D |
| OUT | 6 | OUT is disconnected from the power stage gate. | B |
| CLAMP(UCC5350-Q1) | 7 | Miller Clamp function is not available. | B |
| GND2 (UCC5390-Q1) | 7 | Device is unpowered. OUT stuck high. | B |
| VEE2 | 8 | Device is unpowered. OUT stuck high. | B |
| Pin Name | Pin No. | Shorted to | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|---|
| Vcc1 | 1 | IN+ | OUT follows IN- command. | B |
| IN+ | 2 | IN- | OUT depends on IN+ and IN- driving capability. | B |
| IN- | 3 | GND1 | Cross conduction prevention does not work.. | B |
| Vcc2 | 5 | OUT | OUT stcuk high. Potantail damage to OUT driver. | A |
| OUT(UCC5390-Q1) | 6 | GND2 | OUT stcuk low. Potantail damage to OUT driver. | A |
| OUT(UCC5350-Q1) | 6 | CLAMP | No effect on the driver. The external gate resistor may be shorted out. | D |
| GND2(UCC5390-Q1) | 7 | VEE2 | System supply short. No effect to the driver. | D |
| CLAMP (UCC5350-Q1) | 7 | VEE2 | CLAMP stuck low. Potential damage to OUT driver. | A |
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| Vcc1 | 1 | No effect. Short to same potentail. | D |
| IN+ | 2 | OUT follows IN- command. | B |
| IN- | 3 | OUT stuck low. | B |
| GND1 | 4 | Device is unpowered. | D |
| Vcc2 | 5 | No effect. Short to same potentail. | D |
| OUT | 6 | OUT stuck high. Potential damage to OUT driver. | A |
| CLAMP(UCC5350-Q1) | 7 | CLAMP stuck high. Potential damage to OUT and CLAMP driver. | A |
| GND2 (UCC5390-Q1) | 7 | Device is unpowered. | D |
| VEE2 | 8 | Device is unpowered. | D |