ZHCSL91B October 2020 – March 2022 TPS25947
PRODUCTION DATA
The following table summarizes the device response to various fault conditions. Additionally, an active low external fault indication (FLT) pin is available on the TPS259470x 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 Reverse Polarity | 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 |
Reverse Current ((VOUT – VIN) > VREVTH) | Reverse Current Blocking |
N |
L |
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 also releases the FLT pin for the TPS259470x variants and resets the tRST timer for the TPS25947xA (auto-retry) variants.
During a latched fault, pulling the EN/UVLO just below the UVLO threshold has no impact on the device. This is true for both TPS25947xL (latch-off) and TPS25947xA (auto-retry) variants.
For TPS25947xA (auto-retry) variants, on expiry of the tRST timer after a fault, the device restarts automatically and the FLT pin is de-asserted (TPS259470A variant).