TLE94106EL Datasheet, PDF (37/75 Pages) Infineon Technologies AG – Six half bridge power outputs

TLE94106EL
Half-Bridge Outputs
V_S
V_{OV OFF}
V_{OV HY}
V_{OV ON}
V_{UV OFF}
V_{UV HY}
V_{UV ON}
t
V_OUTx
ON
High Z
VS_UV error bit
High
Low
Output
reactivated
V_OUTx
ON
t ^{High Z}
SPI command :
Clear SYS _DIAG1
VS_OV error bit
High
t
Low
Output
reactivated
t
SPI command
Clear SYS_DIAG1
t
Figure 12 Output behavior during under- and overvoltage V_S condition
6.2.5 Open Load
Both high-side and low-side switches of the half-bridge power outputs are capable of detecting an open load
in their activated state. If a load current lower than the open load detection threshold, I_OLD for at least t_dOLD is
detected at the activated switch, the corresponding error bit, HBn_HS_OL or HBn_LS_OL is set and latched. A
global load error bit, LE, in the global status register, SYS_DIAG_1: Global Status 1, is also set for ease of error
scanning by the application software. The half-bridge output however, remains activated.
The microcontroller must clear the error bit in the respective status register to determine if the open load is
still present or disappeared.
High-side outputs, HS1 and HS2, are specifically designed to detect open load thresholds for LED loads. Both
HS1 and HS2 have a unique and lower open load current threshold and filter time which are configurable via
SPI in control register, FW_OL_CTRL.
During PWM operation, the open load detection is blanked and will not be visible in the status register for
power stages used in active free-wheeling
Data Sheet
37
1.0
2016-09-08