BTS7040-1EPA
PROFET™ +2 12V
Diagnosis
9.2.2
Fault Current (IIS(FAULT))
As soon a protection event occurs, changing the value of the internal retry counter (see Chapter 8.3 for more
details) from its reset state, a current IIS(FAULT) is provided by pin IS when DEN is set to “high”. The following 3
situations may occur:
•
If the channel is ON and the number of retries is lower than “nRETRY(CR) + nRETRY(CYC) * nRETRY(NT)”, the current
IS(FAULT) is provided for a time tIS(FAULT)_D after the channel is allowed to restart, after which IIS = IL / kILIS (as
I
shown in Figure 35). During a retry cycle (while timer tRETRY is running) the current IIS(FAULT) is provided each
time the channel diagnosis is checked
•
•
If the channel is ON and the number of retries is equal than “nRETRY(CR) + nRETRY(CYC) * nRETRY(NT)”, the current
IIS(FAULT) is provided until the internal counter is reset (either by expiring of tDELAY(CR) time or by DEN pin
pulse, as described in Chapter 8.3.1)
If the channel is OFF and the internal counter is not in the reset state, the current IIS(FAULT) is provided each
time the channel diagnosis is checked
IN
t
t
IL
IL(OVL)
In ter nal
counter
0
1
2
0
t
DEN
tIS(FAUL T)_D
IIS(FAUL T)
t
IIS(FAUL T)
IIS
IL / kILIS
t
Diagnosis_PROFET_IISFAULT_load.emf
Figure 35 IIS(FAULT) at Load Switching
Figure 36 adds the behavior of SENSE signal to the timing diagram seen in Figure 28, while Figure 37 shows
the relation between IIS = IL / kILIS, IIS(SAT) and IIS(FAULT)
.
Data Sheet
45
Rev. 1.10
2020-12-14
INFINEON [ Infineon ]
