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. LEGAL DISCLAIMER THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMENTATION 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. 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