TLE94106EL Datasheet, PDF (31/75 Pages) Infineon Technologies AG – Six half bridge power outputs

TLE94106EL
Half-Bridge Outputs
6.2.1 Short Circuit of Output to Supply or Ground
The high-side switches are protected against short to ground whereas the low-side switches are protected
against short to supply.
The high-side and low-side power switches will enter into an over-current condition if the current within the
switch exceeds the overcurrent shutdown detection threshold, I_SD. Upon detection of the I_SD threshold, an
overcurrent shutdown filter, t_dSD is begun. As the current rises beyond the threshold I_SD, it will be limited by the
current limit threshold, I_LIM. Upon expiry of the overcurrent shutdown filter time, the affected power switch is
latched off and the corresponding error bit, HBn_HS_OC or HBn_LS_OC is set and latched. See Figure 7 and
Figure 8 for more detail. A global load error bit, LE, contained in the global status register, SYS_DIAG_1, is also
set for ease of error scanning by the application software. The power switch remains deactivated as long as
the error bit is set.
To resume normal functionality of the power switch (in the event the overcurrent condition disappears or to
verify if the failure still exists) the microcontroller shall clear the error bit in the respective status register to
reactivate the desired power switch.
ON
VS
OUTn
| IHS |
I I_{LIM_HS} I
I ISD_HS I
I ILIM_HS - ISD_HS I
Short to GND
t
tdSD_ HS
Short condition on High-Side Switch
Figure 7 High-Side Switch - Short Circuit and Overcurrent Protection
VS
VS
ILS
Short to Supply
OUTn
I_{LIM_ LS}
ISD_LS
I - I _{LIM_ LS SD_LS}
ON
t
tdSD_LS
Short condition on Low-Side Switch
Figure 8 Low-Side Switch - Short Circuit and Overcurrent Protection
Data Sheet
31
1.0
2016-09-08