BTT6050-2EKA_15 Datasheet, PDF (33/54 Pages) Infineon Technologies AG – Smart High-Side Power Switch

BTT6050-2EKA
Diagnostic Functions
7.3.4
SENSE Signal with OUT in Short Circuit to V_S
In case of a short circuit between the OUTput-pin and the V_S pin, all or portion (depending on the short circuit
impedance) of the load current will flow through the short circuit. As a result, a lower current compared to the
normal operation will flow through the DMOS of the BTT6050-2EKA, which can be recognized at the SENSE
signal. The open load at OFF detection circuitry can also be used to distinguish a short circuit to V_S. In that case,
an external resistor to ground R_{SC_VS} is required. Figure 27 gives a sketch of the situation.
Vbat
I_IS(FAULT)
OL
comp.
IS
GND
RIS
ZGND
VS
OUT
V_BAT
V_OL(OFF)
RSC_VS
Short circuit to Vs.svg
Figure 27 Short Circuit to Battery Detection in OFF Electrical Equivalent Circuit
7.3.5 SENSE Signal in Case of Overload
An overload condition is defined by a current flowing out of the DMOS reaching the current limitation and / or the
absolute dynamic temperature swing T_J(SW) is reached, and / or the junction temperature reaches the thermal
shutdown temperature T_J(SC). Please refer to Chapter 6.5 for details.
In that case, the SENSE signal given is by I_IS(FAULT) when the diagnostic is selected.
The device has a thermal latch behavior, such that when the overtemperature or the exceed dynamic temperature
condition has disappeared, the DMOS is reactivated only when the IN is toggled LOW to HIGH. If the DEN pin is
activated, and DSEL pin is selected to the correct channel, the SENSE follows the output stage. If no reset of the
latch occurs, the device remains in the latching phase and I_IS(FAULT) at the IS pin, eventhough the DMOS is OFF.
7.3.6 SENSE Signal in Case of Inverse Current
In the case of inverse current, the sense signal of the affected channel will indicate open load in OFF state and
indicate open load in ON state. The unaffected channels indicate normal behavior as long as the I_INV current is not
exceeding the maximum value specified in Chapter 5.5.
Data Sheet
PROFET™+ 24V
33
Rev. 1.1, 2015-03-04