ZHCSHB3B January 2018 – January 2020 TPS92611-Q1
PRODUCTION DATA.
The TPS92611-Q1 device has a fault bus for diagnostics output. In normal operation, FAULT is weakly pulled up by an internal pullup current source I(FAULT_pullup) higher than VOH(FAULT). If any fault occurs, the fault bus is strongly pulled low by the internal pulldown current source I(FAULT_pulldown). Once V(FAULT) falls below VIL(FAULT), all outputs shut down for protection. The faulty channel keeps retrying until the fault is removed.
If FAULT is externally pulled up with a current larger than I(FAULT_pulldown), the one-fails–all-fail function is disabled and only the faulty channel is turned off.
The fault bus is able to support up to 15 pieces of TPS9261x-Q1, TPS9263x-Q1, or TPS9283x-Q1 devices.
FAULT BUS STATUS | FAULT TYPE | DETECTION MECHANISM | CHANNEL STATE | DEGLITCH TIME | FAULT BUS | FAULT HANDLING ROUTINE | FAULT RECOVERY |
---|---|---|---|---|---|---|---|
FAULT floating or externally pulled up | Open-circuit or short-to-supply | V(IN) – V(OUT) < V(OPEN_th_rising) | On | t(OPEN_deg) | Constant-current pulldown | Device works normally with FAULT pin pulled low. Device sources I(retry) current when PWM is LOW. Device keeps output normal when PWM is HIGH. | Auto recover |
Short-to-ground | V(OUT) < V(SG_th_rising) | On | t(SG_deg) | Constant-current pulldown | Device turns output off and retries with constant current I(retry), ignoring the PWM input. | Auto recover | |
Over-
temperature |
TJ > T(TSD) | On or off | t(TSD_deg) | Constant-current pulldown | Devices turns output off. | Auto recover | |
Externally pulled low | Device turns output off |
FAULT BUS STATUS | FAULT TYPE | DETECTION MECHANISM | CHANNEL STATE | DEGLITCH TIME | FAULT BUS | FAULT HANDLING ROUTINE | FAULT RECOVERY |
---|---|---|---|---|---|---|---|
FAULT floating or externally pulled up | Open-circuit or short-to-supply | Ignored | |||||
Short-to-ground | VOUT < V(SG_th_rising) | On | t(SG_deg) | Constant-current pulldown | Device turns output off and retries with constant current I(retry), ignoring the PWM input. | Auto recover | |
Over-
temperature |
TJ > T(TSD) | On or off | t(TSD_deg) | Constant-current pulldown | Devices turns output off. | Auto recover | |
Externally pulled low | Device turns output off |