SLLA515 November   2020 SN6501-Q1

 

  1.   Trademarks
  2. 1Overview
  3. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 SOT-23 (5) Package
  4. 3Failure Mode Distribution (FMD)
  5. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 SOT-23 (5) Package

4.1 SOT-23 (5) Package

Figure 4-1 shows the SN6501-Q1 pin diagram for the SOT-23 (5) package. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the SN6501-Q1 data sheet.

GUID-20200914-CA0I-RKHF-WNRL-ZVZQLPRWNJGF-low.gif Figure 4-1 Pin Diagram (SOT-23 (5)) Package
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
D11D1 pin stuck low creates short circuit path between Vcc and ground through transformer winding, causing high current to flow and possible damage to transformer. Output voltage out of designed spec.A
VCC2No power to the device. No isolated output voltage.B
D23D2 pin stuck low creates short circuit path between Vcc and ground through transformer winding, causing high current to flow and possible damage to transformer. Output voltage out of designed spec.A
GND4Device continues to function as expected. Normal operation.D
GND5Device continues to function as expected. Normal operation.D
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
D11With D1 open, one primary transformer winding does not store energy. Isolated output supply out of intended set-point.B
VCC2No power to device, so no switching action of D1/D2. Isolated output voltage does not build up.B
D23With D2 open, one primary transformer winding does not store energy. Isolated output supply out of intended set-point.B
GND4Device gets return ground through pin5. Thermal performance may reduce.C
GND5Device gets return ground through pin4. Thermal performance may reduce.C
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
D11VCCD1 stuck high. Makes potential difference between one transformer winding zero. When D1 FET switches on, high current flows from supply to ground. Isolated output supply out of intended set-point.A
VCC2D2D2 stuck high. Makes potential difference between one transformer winding zero. When D2 FET switches on, high current flows from supply to ground. Isolated output supply out of intended set-point.A
D23GNDNot considered. Corner pin.D
GND4GNDNo effect. Normal operation.D
GND5D1Not considered. Corner pin.D
Table 4-5 Pin FMA for Device Pins Short-Circuited to supply
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
D11D1 stuck high. Makes potential difference between one transformer winding zero. When D1 FET switches on, high current flows from supply to ground. Isolated output supply out of intended set-point.A
VCC2No effect. Normal operation.D
D23D2 stuck high. Makes potential difference between one transformer winding zero. When D2 FET switches on, high current flows from supply to ground. Isolated output supply out of intended set-point.A
GND4This creates potential difference between pin4 and pin5, causing high current to flow with possible device damage.A
GND5This creates potential difference between pin4 and pin5, causing high current to flow with possible device damage.A