ibaMS16xDO-2A
Manual
Issue 1.3
19
8
Protective and monitoring functions
8.1
Physical protective functions of the hardware
Important note
The protective functions are only guaranteed when the polarity is correct.
The output channels have several self-protective functions for preventing damages to
the device even when there are faults in the load circuit.
8.1.1
Shorted load protection
The load switch limits the current and switches off when the load impedance breaks
down to up to 0
Ω in the switched on status
and when the device is switched on at such
a low-resistant load. This way, the load switch is not damaged. The shorted load protec-
tion is only guaranteed when polarity is correct.
Note
The scenario described above is named „shorted load“ in this manual, for a better dif-
ferentiation from the internal short-switching of the load switch (shorted switch).
8.1.2
Over temperature protection
Each channel switches off individually in case the load-switch IC exceeds a certain max-
imum junction temperature (T
LS
). This can be caused by:
Continuous currents that are too high
Periodical switch loads that are too high (load voltages and/or switching frequen-
cies)
Ambient temperature that is too high
Shorted load
8.1.3
Overcurrent protection
Each channel switches off individually if the current in the load circuit exceeds a value
that is too high for guaranteeing the service life of the fuse. This can be triggered by:
Continuous currents that are too high
Inrush currents that are too intensive
Shorted load
8.1.4
Toleration of capacitive and PTC loads
The channels can process short inrush currents that are clearly above the permissible
continuous current. This is why a complete self-protection is guaranteed for these loads.
