User Guide
6 of 46
Rev. 1.0
2022-03-09
48V Battery Switch Reference Design
R 48V BATT Switch10
The kit at a glance
1.2
Block diagram
The design of the switch revolves around the 2 channel MOSFET gate driver
2ED4820-EM
. Channel A is used to
control the power MOSFETs for (dis-)connecting the battery. Channel B drives the MOSFETs for the DC-link
precharge circuit.
In order to improve functional safety there are two diverse methods implemented for current monitoring and
overcurrent protection – shunt based current sensing on the low side and hall based current sensing with the
TLE4972-AE35D5
on the high side.
The switch is controlled by a XMC4700 microcontroller kit which also provides a user interface via USB port.
Figure 3
Block diagram
1.3
Main features
Bidirectional 48V battery switch for continuous currents up to 300 A
Precharge path for capacitive loads (e.g. DC-Link capacitor, EMC filter)
Passive freewheeling (active freewheeling optional)
Shunt based current measurement and monitoring in low side path
Hall based current measurement and monitoring in high side path
Current sensor programmer interface for calibration and configuration of the hall sensor
Over current protection with adjustable thresholds
Pre-installed firmware including command line interface
