ZHCSOF9B april 2022 – june 2023 TPS25981
PRODUCTION DATA
The following table summarizes the device response to various fault conditions. Additionally, an active low external fault indication (FLT) pin is available.
Event | Protection Response | Fault Latched Internally | FLT Pin Status | FLT Assertion Delay |
|---|---|---|---|---|
Overtemperature | Shutdown | Y | L | |
Undervoltage (UVP or UVLO) | Shutdown | N | H | |
Input overvoltage | Shutdown | N | H | |
Transient overcurrent (ILIM < IOUT < 2 × ILIM) | None | N | N | |
Persistent overcurrent | Circuit-breaker | Y | N/A | |
Output short circuit to GND | Circuit-breaker followed by current limit | N | H | |
ILM pin open (during steady-state) | Shutdown | N | L | tITIMER |
ILM pin shorted to GND | Shutdown | Y | L | tITIMER |
Faults which are latched internally can be cleared either by power cycling the part (pulling VIN to 0 V) or by pulling the EN/UVLO pin voltage below VSD. This action also releases the FLT pin and resets the tRSTtimer for the TPS25981xA (auto-retry) variants.
During a latched fault, pulling the EN/UVLO just below the UVLO threshold has no impact on the device. This fact is true for both TPS25981xL (latch-off) and TPS25981xA (auto-retry) variants.
For TPS25981xA (auto-retry) variants, on expiry of the tRSTtimer after a fault, the device restarts automatically and the FLT pin is de-asserted.