VND5E160AJ-E Datasheet, PDF (26/37 Pages) STMicroelectronics – Double channel high side driver with analog current sense for automotive applications

Application information
VND5E160AJ-E
3.4
Current sense and diagnostic
The current sense pin performs a double function (see Figure 33: Current sense and
diagnostic):
● Current mirror of the load current in normal operation, delivering a current
proportional to the load one according to a know ratio K_X.
The current I_SENSE can be easily converted to a voltage V_SENSE by means of an
external resistor R_SENSE. Linearity between I_OUT and V_SENSE is ensured up to 5V
minimum (see parameter V_SENSE in Table 9: Current sense (8V<VCC<18V)). The
current sense accuracy depends on the output current (refer to current sense electrical
characteristics Table 9: Current sense (8V<VCC<18V)).
● Diagnostic flag in fault conditions, delivering a fixed voltage V_SENSEH up to a
maximum current I_SENSEH in case of the following fault conditions (refer to Truth table):
– Power limitation activation
– Over-temperature
– Short to V_CC in OFF state
– Open load in OFF state with additional external components.
A logic level high on CS_DIS pin sets at the same time all the current sense pins of the
device in a high impedance state, thus disabling the current monitoring and diagnostic
detection. This feature allows multiplexing of the microcontroller analog inputs by sharing of
sense resistance and ADC line among different devices.
Figure 33. Current sense and diagnostic
V_BAT
V_PU
V_CC
41V
IOUT/KX
CS_DIS
ISENSEH
Main MOSn
PU_CMD
Overtemperature
OL OFF
Pwr_Lim
+
RPU
-
VOL
I_Loff2r
OUTn I_Loff2f
INPUTn
RPROT
V_SENSEH
CURRENT
SENSEn
GND
RPD
To uC ADC
R_SENSE
V_SENSE
Load
26/37