ZHCSOF8C november 2021 – april 2023 TPS2597
PRODUCTION DATA
Table 8-3 summarizes the device response to various fault conditions. Additionally, an active low external fault indication (FLT) pin is available on the TPS25970x variants.
EVENT | PROTECTION RESPONSE | FAULT LATCHED INTERNALLY | FLT PIN STATUS (1) | FLT ASSERTION DELAY(1) |
|---|---|---|---|---|
Overtemperature | Shutdown | Y | L | |
Undervoltage (UVP or UVLO) | Shutdown | N | H | |
Input Overvoltage | Shutdown(1)(2) | N | H | |
Voltage Clamp(2) | N | N/A | ||
Transient Overcurrent (ILIM < IOUT < 2 × ILIM) | None | N | N | |
Persistent Overcurrent | Circuit Breaker(3) | Y | N/A | |
| Persistent Overcurrent | Current Limit(4) | N | L | tITIMER |
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 for the TPS25970x variants and resets the tRSTtimer for the TPS2597xA (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 TPS2597xL (latch-off) and TPS2597xA (auto-retry) variants.
For TPS2597xA (auto-retry) variants, on expiry of the tRSTtimer after a fault, the device restarts automatically and the FLT pin is de-asserted (TPS25970A variant).