BTS 3256D

Demoboard Description, Rev. 1.0, Oktober 2008
BTS 3256D
How to use the Demoboard
Automotive Power
Demoboard
BTS 3256D
Abstract
1
Abstract
This Application Note is intended to provide a fast start with the BTS 3256D Demoboard.
In normal application usage the BTS 3256D is designed to interact with some kind of µC,
therefore it is a little bit effort to set up a circuit in the lab.
To minimize this effort we supply You with the BTS 3256D Demoboard.
2
Introduction
The BTS 3256D Demoboard is a small PCB (7 cm × 8 cm) where a engineering sample
is already mounted with a 6 cm2 copper cooling area. LEDs show the device status. All
device pins can be directly accessed and a jumper disconnects the attached logic from
the device to avoid interferences for customer measurements.
3
Circuit Description
Out of the application circuit from Figure 1 the Demoboard was developed.
L1
R1
CS
ECU / PCB
VS
LDO
GND
V S BTS3256
V bb
Logic
VS
I/ O
IN/Fault
µC
GND
I/ O
Supply 1.emf
Figure 1
Typical Application Circuit
It was assumed that You want to see the device Status immediately and might also use
the Status signal for diagnosis purposes.
We did not implement a µC to give You still direct access to the device IN pin.
Demoboard Description
Rev. 1.0, 2008-10-10
Demoboard
BTS 3256D
Circuit Description
As the Demoboard will be used for evaluation we also implemented a easy way (jumper)
to access the device without additional components on the IN path.
3.1
Demoboard Circuit
The Demoboard is using two XOR and LEDs to give a feedback of the device status.
A LDO voltage regulator TLE 4295 is used to supply the two XOR logic devices and the
LEDs.
The Capacitors C1 and C2 are needed to stabilize the 5 V-Regulator. C1 is also used to
stabilize VS.
The voltage on the VS pin must not reach undervoltage lockout during operation.
The voltage on the IN pin together with R1 is used to feedback the status of BTS 3256D.
By removing the Jumper J1 the IN pin is separated from the logic circuit and can be
directly accessed from the measurement point called “Status”. In this case the signal on
the IN connector will not reach the BTS 3256D anymore and also there will be no output
on the STATUS connector of the PCB.
Loadsupply
Vbat
C1
Drain
STATUS
VS
BTS3256
IN
R1
Logic
IN/Fault
TLE4295
5V
D1
D2
C2
GND
Figure 2
Demoboard Circuitry
Demoboard Description
3
Rev. 1.0, 2008-10-10
Demoboard
BTS 3256D
Circuit Description
For detailed reference the Schematic is shown:
Figure 3
3.2
Schematics
Bill of Material
The following Table 1 is showing the important parts on the Demoboard and the values
used in partitioning.
Table 1
Extract of Bill of Material
Part Number
Value
Functional Description
R4
R1
C1
C2
50k Potentiometer
set switching speed (ton / toff)
3k3
used to generate digital status feedback
100 n (100 V)
stabilize Vbat
2u2
needed for 5 V-regulator
Demoboard Description
4
Rev. 1.0, 2008-10-10
Demoboard
BTS 3256D
Additional Information
Table 1
Extract of Bill of Material (cont’d)
Part Number
Value
Functional Description
D1
LED Green OK
active if no fault and device is switched on
D2
LED Red FAILURE
active if device is switched on and fault
occurred
4
Additional Information
This description should be a help to get the Demoboard working.
For device behaviour please refer to the data sheet.
Demoboard Description
5
Rev. 1.0, 2008-10-10
Demoboard
BTS 3256D
Revision History
5
Revision History
BTS 3256D
Revision History:
2008-10-10
Previous Version:
none
Page
Rev. 1.0
Subjects (major changes since last revision)
Demoboard Description
6
Rev. 1.0, 2008-10-10
Edition 2008-10-10
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2008.
All Rights Reserved.
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OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY
DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR QUALITY OF THE
INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY
ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON TECHNOLOGIES HEREBY
DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND (INCLUDING WITHOUT
LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF ANY
THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements components may contain dangerous substances. For information on the types in
question please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
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