User Guide
15 of 46
Rev. 1.0
2022-03-09
48V Battery Switch Reference Design
R 48V BATT Switch10
System and functional description
At the location of the hall probes this structure yields a magnetic field strength of ~45 µT/A. This so-called
current rail transfer factor can be determined either by simulation or by measuring the output voltage of the
hall sensor at a given current and using the selected sensitivity range value from the data sheet (in mV/mT) to
calculate the transfer factor in µV/A.
The TLE4972-AE35D5 can be configured and calibrated on board by programming the sensor internal EEPROM
with the TLE4972 current sensor programmer kit
1
, which can be connected to the adaptor board as shown in
Figure 14
Connection of the current sensor programmer
The hall sensor on each board is calibrated and set to the following values:
Table 4
TLE4972-AE35D5 Configuration
Parameter
Setting
Value
Output Mode
Fully differential
Sensitivity Range
S2
46.5 mV / mT
OCD1 Threshold
6
389 A
OCD2 Treshold
10
246 A
Sensitivity (single ended)
2.4 mV/A
Sensitivity (fully differential)
4.8 mV/A
According to the data sheet full scale for the TLE4972-AE25D5 is defined as 1200 mV in single ended mode and
2400 mV in fully differential mode, which amounts to a default measurement range of ±500 A.
Due to the orientation of the sensor in respect to the current flow, a current flowing from positive supply to
ground will be reported as a negative current on the analog output.
1
Order name: „CUR SENSOR PROGRAMMER“, Order number: SP004441438
