™
PROFET + 24V
BTT6200-4ESA
Diagnostic functions
7.3
SENSE signal in nominal current range
Figure 21 shows the current sense as a function of the load current in the power DMOS. Usually, a pull-down
resistor RIS is connected to the current sense IS pin. This resistor has to be higher than 560 Ω to limit the power
losses in the sense circuitry. A typical value is 1.2 kΩ. The blue curve represents the ideal sense current,
assuming an ideal kILIS factor value. The red curves shows the accuracy the device provides across full
temperature range at a defined current.
Figure 21
Current sense for nominal load
7.3.1
SENSE signal variation as a function of temperature and load
current
In some applications a better accuracy is required at smaller currents. To achieve this accuracy requirement, a
calibration on the application is possible. To avoid multiple calibration points at different load and temperature
conditions, the BTT6200-4ESA allows limited derating of the kILIS value, at a given point (IL3; TJ = +25°C). This
derating is described by the parameter ΔkILIS. Figure 22 shows the behavior of the sense current, assuming one
calibration point at nominal load at +25°C.
The blue line indicates the ideal kILIS ratio.
The green lines indicate the derating on the parameter across temperature and voltage, assuming one
calibration point at nominal temperature and nominal battery voltage.
The red lines indicate the kILIS accuracy without calibration.
Datasheet
28
Rev. 1.00
2019-03-09
INFINEON [ Infineon ]
