Infineon Battery Switch 24V User Manual
User Guide Please read the Important Notice and Warnings at the end of this document Revision 1.3
www.infineon.com 2020-09-11
Battery Switch 24V - System Demonstrator
User Guide
About this document
Scope and purpose
This Board User Manual provides a short introduction into the Battery Switch 24V - System Demonstrator and
its application.
Intended audience
Electrical engineers who are qualified and familiar with the challenges of handling high current circuits.
User Guide 2 Revision 1.3
2020-09-11
Battery Switch 24V - System Demonstrator
User Guide
Important notice
Important notice
The Evaluation Boards and Reference Boards as well as the information in this document are solely intended to
support designers of applications in evaluating the use of products from Infineon Technologies for their
intended applications.
Environmental conditions have been considered in the design of the Evaluation Boards, Reference Boards and
the like provided by Infineon Technologies. The design of the Evaluation Boards and Reference Boards has
been tested by Infineon Technologies only as described in this document. The design is not qualified in terms of
safety requirements, manufacturing and operation over the entire operating temperature range or lifetime.
The Evaluation Boards and Reference Boards provided by Infineon Technologies are subject to functional
testing only under typical load conditions. Evaluation Boards and Reference Boards are not subject to the same
procedures as regular products regarding returned material analysis (RMA), process change notification (PCN)
and product discontinuation (PD).
Evaluation Boards and Reference Boards are not commercialized products, and are solely intended for
evaluation and testing purposes. In particular, they shall not be used for reliability testing or production. The
Evaluation Boards and Reference Boards may therefore not comply with CE or similar standards (including but
not limited to the EMC Directive 2004/EC/108 and the EMC Act) and may not fulfill other requirements of the
country in which they are operated by the customer. The customer shall ensure that all Evaluation Boards and
Reference Boards will be handled in a way which is compliant with the relevant requirements and standards of
the country in which they are operated.
The Evaluation Boards and Reference Boards as well as the information provided in this document are
addressed only to qualified and skilled technical staff, for laboratory usage, and shall be used and managed
according to the terms and conditions set forth in this document and in other related documentation supplied
with the respective Evaluation Board or Reference Board.
It is the responsibility of the customer’s technical departments to evaluate the suitability of the Evaluation
Boards and Reference Boards for the intended application, and to evaluate the completeness and correctness
of the information provided in this document with respect to such application.
The customer accepts that the Evaluation Boards and Reference Boards are not intended to be used in lifeendangering applications such as medical, nuclear, military, life-critical or other applications, where failure
of the Evaluation Boards and Reference Boards, or any results from the use thereof, can reasonably be
expected to result in personal injury.
The Evaluation Boards and Reference Boards and any information in this document is provided "as is" and
Infineon Technologies disclaims any warranties, express or implied, including but not limited to warranties of
non-infringement of third party rights and implied warranties of fitness for any purpose, or for merchantability.
Infineon Technologies shall not be responsible for any damages resulting from the use of the Evaluation Boards
and Reference Boards and/or from any information provided in this document. The customer is obliged to
defend, indemnify and hold Infineon Technologies harmless from and against any claims or damages arising
out of or resulting from any use thereof.
Infineon Technologies reserves the right to modify this document and/or any information provided herein at
any time without further notice.
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Battery Switch 24V - System Demonstrator
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Table of contents
Table of contents
About this document ....................................................................................................................... 1
Important notice ............................................................................................................................ 2
Table of contents ............................................................................................................................ 3
1 Overview ...................................................................................................................... 4
2 Connecting the Switch ................................................................................................... 6
2.1 Overview .................................................................................................................................................. 6
2.2 Control ..................................................................................................................................................... 7
2.2.1 Pin Assignment ................................................................................................................................... 7
2.2.2 Input Voltage Range ........................................................................................................................... 8
2.2.3 Control with bistable relay adaptor .................................................................................................. 9
3 Operating Range ........................................................................................................... 10
3.1 Voltage Range ........................................................................................................................................ 10
3.2 Current Rating ....................................................................................................................................... 10
4 Thermal Behavior ......................................................................................................... 11
5 Switching Behaviour ..................................................................................................... 12
6 Mechanical Dimensions ................................................................................................. 13
7 Schematics .................................................................................................................. 14
8 PCB Description ............................................................................................................ 17
8.1 PCB Technology .................................................................................................................................... 17
8.2 PCB Layout ............................................................................................................................................ 18
9 Bill Of Materials ............................................................................................................ 19
Revision History ............................................................................................................................ 20
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Battery Switch 24V - System Demonstrator
User Guide
Overview
1 Overview
The Battery Switch 24V - System Demonstrator shows a semiconductor based solution of a 24 V battery master
switch for trucks.
Note: This demonstrator focus lies solely on the switching element and the demonstration of the current
carrying and short circuit handling capabilities.
The demonstrator consists of eight low ohmic MOSFETs connected in parallel and mounted on a structured
copper IMS (insolated metal substrate) board together with a gate driver circuit to switch those MOSFETs on
and off. In order to protect the MOSFETs against excessive overvoltage there are four transient voltage
suppressor diodes implemented at the bottom side of the board.
Table 1 Main Components
Component
Type
Comment
MOSFETs (8x)
IPLU300N04S4-R8
300 A, 40 V, 0.53 mOhm typ.
TVS Diodes (4x)
SMDJ33A
33 V
Gate Driver
AUIR3242S
Normally on (default)
AUIR3241S
Normally off (optional)
Thanks to the low ohmic MOSFETs the on state resistance of the whole switch is less than 160 uΩ from terminal
to terminal. The eight parallel MOSFETs account for typically 67 uΩ at room temperature. At 120°C board
temperature and 500 A current this value will increase to roughly 100 uΩ.
Please note that the Battery Switch 24V - System Demonstrator is a unidirectional switch. This means that it will
interrupt current flowing from the battery to the load but not current flowing into the battery. The reason for
this is the intrinsic body diode of the power MOSFETs as shown in Figure 1. Therefore charging through the
MOSFETs should be avoided or at least limited to currents below 20 A when the switch is deactivated (off).
Figure 1 Unidirectional Switch due to MOSFET Body Diode
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Battery Switch 24V - System Demonstrator
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Overview
Figure 2 Battery Switch 24V - System Demonstrator Top View
Figure 3 Battery Switch 24V - System Demonstrator Bottom View
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Connecting the Switch
2 Connecting the Switch
2.1 Overview
Figure 4 Basic Connection Diagram
Figure 5 Connecting the Bus Bars with M4 Screws
The switch shall be connected between battery and load as pictured in Figure 4. It is recommended to use
copper bus bars to provide a low ohmic current path. To ensure proper contact to the PCB please use copper
washers between the PCB and the bus bar (Figure 6).
Mechanical dimensions of the board and the mounting holes can be found in chapter 6 Mechanical Dimensions
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Battery Switch 24V - System Demonstrator
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Connecting the Switch
Figure 6 Copper washers between PCB and bus bar
2.2 Control
2.2.1 Pin Assignment
The switch can be controlled by a logic level signal on pin 5 (Input) of the header connector X1.
This connector is a standard 6-pin dual row 2.54 mm header (Samtec TSM-103-01-T-DV).
Figure 7 Controll Connector X1 Pin Assignment
Table 2 X1 Pin Description
Pin
Name
Function
1
GND
Ground
2
GND
Ground
3
Source
Voltage at the output of the switch
4
+24 V
Voltage at the battery terminal of the switch, protected via diode against
reverse polarity. Can be used to power own circuitry3
5
Input
Control signal for switch
6
NC
Not connected
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