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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