4

Fault management

The device integrates an open-drain output connected to the SD pin. As soon as a fault occurs, the open-drain is

activated and the LVGx outputs are forced low. Two types of fault can be identified:

•

Overcurrent (OC) sensed by the internal comparator (see more detail in Section 4.1 Smart shutdown

function);

•

Undervoltage on supply voltage (VCC)

Each fault enables the SD open drain for a different time, as described in the following table.

Table 11. Fault timing

Symbol

Parameter

Event time (1)

SD open-drain enable time result (1)(2)

OC

Over-current event

≤ 24 μs

24 μs

> 24 µs

OC time

UVLO

Under-voltage lockout event

≤ 70 μs

70 µs

> 70 µs

until the VCC_LS exceeds the

VCC_LS UV turn ON threshold

UVLO time

1. Typical value (-40 °C ≤ TJ ≤ +125 °C).

2. Without contribution of the RC network on SD.

Actually, the device remains in a fault condition (SD at low logic level and LVGx outputs disabled) for a time also

depending on the RC network connected to the SD pin. The network generates a time contribution that is added

to the internal value.

Figure 4. Overcurrent timing (without contribution of the RC network on SD)

GIPG120520141638FSR

STIB1560DM2T-LZ

Fault management

DS13556 - Rev 1

page 10/23