TCS High-Speed Protector Bourns (HSP) Evaluation Boards TECHNICAL NOTE Introduction This set of three evaluation boards aids in evaluating the use of a Bourns TCS High-Speed Protector (HSP) in conjunction with a TVS diode to protect a signal line. Each of the three evaluation boards TCS-DL004-250-WH can be detached from the main board, and cut and jumpered into an existing circuit design for easy system evaluation. They can also be used to evaluate the performance of the HSP devices on the lab bench. Each board contains one dual channel HSP and two TVS diodes, one from each line to ground on the Figure 1 Evaluation Board Schematic input side of the board. Figure 1 shows the schematic for each of the three boards. The only difference between them is which HSP device is installed. The HSP part number is shown on the bottom side of each board (see figure3). Each board comes with two CDSOD323-T05C bidirectional TVS diodes (V = 5 V) installed. They can be replaced RWM with different voltage devices when the application requires it. Figure 2 Top Side of PCB e smTh aller boards can be separated by placing the board on a flat surface, such as a lab bench, with the section that you want to detach hanging over the edge of the surface. You can then bend the board using two hands so that it breaks on the score line. It does take a reasonable amount of force to detach it. If it helps to make the board shorter, the ends can be broken off along the score lines using a similar technique. Figure 3 Bottom Side of PCB Performance Table 1 e TTh CS HSP family of electronic current limiters when subjected to a 1.2/50 s voltage, 8/20 s current is designed to limit current to a preset level under combination waveform with a peak amplitude of 600V. transient conditions while providing a low impedance Note that with this test circuit the voltage across the HSP under normal circuit operation. The test circuit in device is the same as the voltage across the TVS diode. figure4 was used to demonstrate the performance of the Aer tft he brief peak current of 690 mA the current TCS-DL004-250-WH under surge conditions. through the HSP device is limited to just over 300 mA. Figures5 and 6 show the performance of the circuit TCS High-Speed Protector Bourns (HSP) Evaluation Boards TECHNICAL NOTE Using the Evaluation Boards Each of the three evaluation boards is capable of provides protection against common mode transients, protecting two signal lines. In a typical application, the the two TVS diodes on the board can be replaced with ESD protection internal to the IC being protected will a single TVS diode placed across the signal lines. The TCS-DL004-250-WH provide a path for the current flowing through the HSP pad spacing was designed to accommodate placing a device. In cases where the internal ESD protection is diode in a SOD323 package between the signal lines not robust enough, a second TVS diode must be added (see figure 2). The I/O pads are sized to accommodate to the IC side of the HSP. In transformer coupled gauge 24 or higher wire sizes. differential signal applications where the transformer Figure 4 TCS HSP Surge Test Circuit Figure 5 Surge Performance Figure 6 Surge Performance (Zoomed In) For more information on the Bourns TCS High-Speed Protector Series, please visit www.bourns.com TCS is a trademark of Bourns, Inc. in the U.S. and other countries. COPYRIGHT 2016 BOURNS, INC. 06/16 e/TCS1602 Bourns is a registered trademark of Bourns, Inc. in the U.S. and other countries. Americas: Tel +1-951 781-5500 EMEA: Tel +36 88 520 390 Asia-Pacific: Tel +886-2 256 241 17 Email americus bourns.com Email eurocus bourns.com Email asiacus bourns.com