User Guide
43 of 46
Rev. 1.0
2022-03-09
48V Battery Switch Reference Design
R 48V BATT Switch10
System performance
4.4
Overcurrent detection with hall sensor
For testing the overcurrent detection of the hall based current sensor
TLE4972-AE35D5
the OCD1 output has to
be connected to the SAFESTATEN input of the gate driver
2ED4820-EM
as described in Figure 15. The
overcurrent detection threshold of the 2ED4820-EM needs to be disabled by setting it to a significantly higher
value in order not to interfere with the hall sensor measurement.
The overcurrent detection threshold OCD1 of the hall sensor is factory-set to 389 A (see Table 4). Depending on
the current slew rate the actual current value at start of the switch deactivation may be higher as can be seen in
Figure 52. This is caused by time constants of the magnetic circuit formed by the current rail and the hall sensor
probes, which lead to a low pass behaviour of the current sensor.
Figure 52
Overcurrent detection – hall sensor TLE4982-AE35D5
