BTM7752G Demoboard

Trilith IC 3G - H-Bridge Demo Board
Version 1.1
Demo Board Description
V1.0, 2011-10-18
Automotive Power
Trilith IC 3G - H-Bridge Demo Board
Version 1.1
General Description
Figure 1
Demo board (top view)
1
General Description
The Trilith IC 3G - H-Bridge Demo Board contains one Trilith IC in a typical H-bridge configuration including
peripheral components and reverse polarity protection. Control signals can be supplied via a 26 pin header
connector or a 96 pin board connector. The board is compatible to all members of the Trilith IC 3G family in a PGDSO36 package (like BTM7752G and BTM7755G).
1.1
Layout Considerations
Special care has been taken to the PCB layout to minimize stray inductances in the power bridge design as it is
necessary in all switched high power bridges. The Trilith IC has no separate pin for power ground and logic ground.
Therefore it is recommended to assure that the offset between the ground connection of the slew rate resistor, the
current sense resistor and ground pins of the device is minimized. In this board this is achieved by routing the high
current traces from the 470µF supply capacitor to the bridge so that the area spanned by the loop is as small as
possible. In addition a ceramic capacitor from VS to GND close to the device is implemented to provide current for
the switching phase via a low impedant path and therefore reducing noise and ground bounce.
It also needs to be assured that all supply pins are shorted and the voltage offset between the supply pins on both
sides of the package is as small as possible. This was done on this board by a direct connection of the supply pins
(VS) via a wide trace below the package and mid-tap to the supply capacitor.
The digital inputs are protected from excess currents (e.g. caused by induced voltage spikes) by 10 kΩ series
resistors.
Demo Board Description
2
V1.0, 2011-10-18
Trilith IC 3G - H-Bridge Demo Board
Version 1.1
General Description
1.2
Connector Pin Assignment
Figure 2
2
4
6
8 10 12 14 16 18 20 22 24 26
1
3
5
7
26 pin header connector (top view)
Pin
Signal
1
IN1
Input of half-bridge 1
2
INH
Inhibit
Description
3
IN2
18
GND
GND
20
GND
GND
23
IS / ST
25
GND
GND
26
GND
GND
others
NC
Figure 3
9 11 13 15 17 19 21 23 25
Input of half-bridge 2
Current sense output or Status output
(can be connected by jumper JP4 via sense resistor R7 to GND or via pull-down R10 to external Vdd (5V))
Not connected
96 pin board connector (front view)
Pin
Signal
A1
VBAT/vIN
B1
GND
Description
VBAT going to external control board / starter kit
GND
C1
VDD
Vdd (5V) coming from external control board / starter kit
A4
OUT1
Output of halfbridge 1 - control signal going to external control board (clamped to 5V by onboard zener diode)
B4
OUT2
Output of halfbridge 2 - control signal going to external control board (clamped to 5V by onboard zener diode)
C4
IS / ST
Status output connected via JP4 (for use of BTM77x5G)
A12
IN1
Input of half-bridge 1
A13
IN2
Input of half-bridge 2
A15
INH
Inhibit
B20
SCL
Serail Clock Input of “board ID” EEPROM
C20
SDA
Serial Data Output of “board ID” EEPROM
C26
GND
GND
C27
IS
Current sense output connected via JP4 (for us of BTM77x2G)
others
NC
Not connected
Demo Board Description
3
V1.0, 2011-10-18
Trilith IC 3G - H-Bridge Demo Board
Version 1.1
General Description
1.3
Jumper
Jumper Settings
Description
JP1
Connects VIN (VBAT, suppyl voltage) to external control board / starter kit
Default: not connected
JP2
(Diag2)
Connects OUT 2 (output of halfbridge 2) to pull-down resistor R3 and connector pin B4
Default: connected
JP3
(Diag1)
Connects OUT 1 (output of halfbridge 1) to pull-down resistor R9 and connector pin A4
Default: connected
JP4
Current sense output or Status output
Pos.1 (pin 1-2): IS/ST connected to pull-down (sense) resistor (for BTM77x2G with current sense)
Pos.2 (pin 2-3): IS/ST connected via pull-up resistor to external Vdd (for BTM77x5G with open-drain status)
Default:
Pos. 1 (BTM77x2G)
Pos. 2 (BTM77x5G)
1.4
Board ID
The Trilith IC H-Bridge Demo Board features a two wire serial EEPROM (IC2) including a board ID to distinguish
between different types of demo boards. The supply voltage VDD for this EEPROM (pin C1 front board connector)
has to be supplied by the control board or starter kit. The serial clock input SCL (pin B20) has to be provided by
the control board (microcontroller). The serial data output (pin C20) can be connected to an I/O of the
microcontroller to read the board ID.
Demo Board Description
4
V1.0, 2011-10-18
Trilith IC 3G - H-Bridge Demo Board
Version 1.1
Schematic
2
Schematic
Figure 4
Schematic
Demo Board Description
5
V1.0, 2011-10-18
Trilith IC 3G - H-Bridge Demo Board
Version 1.1
Top Layer
3
Top Layer
Figure 5
Top layer
4
Bottom Layer
Figure 6
Bottom layer
Demo Board Description
6
V1.0, 2011-10-18
Trilith IC 3G - H-Bridge Demo Board
Version 1.1
Revision History
5
Revision History
Trilith IC 3G - H-Bridge Demo Board
Version 1.1
Revision History Document: V1.0, 2011-10-18
Previous Version(s): Page
Subjects (major changes since last demo board revision V1.0)
- changed T1 (reverse polarity MOSFET) to IPD90P03P4L
- changed R3 and R9
initial version of documentation
Demo Board Description
7
V1.0, 2011-10-18
Edition 2011-10-18
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2011 Infineon Technologies AG
All Rights Reserved.
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