User Guide
9 of 46
Rev. 1.0
2022-03-09
48V Battery Switch Reference Design
R 48V BATT Switch10
System and functional description
Compatibility with other microcontroller boards
By default, the reference kit comes equipped with the XMC4700 Relax Lite Kit. However, thanks to the adaptor
board in Arduino shield form factor the switch can also be connected to other Arduino UNO compatible
microcontroller boards like the AURIX TC375 Lite Kit.
Note:
Since the hall based current sensor is a 3.3 V device this reference kit was designed for a digital
supply voltage of 3.3 V. Therefore, the microcontroller board has to be a 3.3 V type.
2.2
Description of the functional blocks
2.2.1
Power supply
The kit requires two power supplies, the battery voltage VBAT and the digital supply voltage VDD.
VBAT can be provided by a 48 V DC power source, like a 48 V battery or a lab power supply. It supplies the gate
driver
2ED4820-EM
and the power stage.
The digital supply voltage VDD is derived from the 3.3 V supply of the microcontroller kit, which is powered via
the USB connector. VDD supplies the digital interface of the gate driver and the hall based current sensor
TLE4972-AE35D5
.
Table 3
Functional Range
Parameter
Symbol
Min.
Max.
Unit
Battery Voltage
VBAT
24
54
V
Logic Supply Voltage
VDD
3.1
3.5
V
2.2.2
Power stage
Figure 6
Power stage schematics
The power stage consists of five pairs of best in class OptiMOS
™
-5 Power-Transistors
IAUT300N08S5N011
(80V,
1.1 m
W
) in common source topology. The common source topology has been chosen because it allows the
