TCS™ High-Speed Protector
(HSP) Evaluation Boards
Bourns®
TECHNICAL NOTE
Table 1
Introduction
is 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
can be detached from the main board, and cut and
jumpered into an existing circuit design for easy
system evaluation. ey 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
input side of the board. Figure 1 shows the schematic
for each of the three boards. e only dierence
between them is which HSP device is installed. e
HSP part number is shown on the bottom side of
each board (see gure3). Each board comes with
two CDSOD323-T05C bidirectional TVS diodes
(VRWM= 5 V) installed. ey can be replaced
with dierent voltage devices when the application
requires it.
e smaller boards can be separated by placing the
board on a at 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 o
along the score lines using a similar technique.
Performance
e TCS™ HSP family of electronic current limiters
is designed to limit current to a preset level under
transient conditions while providing a low impedance
under normal circuit operation. e test circuit in
gure4 was used to demonstrate the performance of the
TCS-DL004-250-WH under surge conditions.
Figures5 and 6 show the performance of the circuit
when subjected to a 1.2/50 µs voltage, 8/20 µs current
combination waveform with a peak amplitude of 600V.
Note that with this test circuit the voltage across the HSP
device is the same as the voltage across the TVS diode.
Aer the brief peak current of 690 mA the current
through the HSP device is limited to just over 300 mA.
Figure 2 Top Side of PCB
Figure 1 Evaluation Board Schematic
Figure 3 Bottom Side of PCB
TCS-DL004-250-WH
TCS™ High-Speed Protector
(HSP) Evaluation Boards
Bourns®
TECHNICAL NOTE
Americas: Tel +1-951 781-5500
Email americus@bourns.com
EMEA: Tel +36 88 520 390
Email eurocus@bourns.com
Asia-Pacic: Tel +886-2 256 241 17
Email asiacus@bourns.com
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.
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
COPYRIGHT© 2016 • BOURNS, INC. • 06/16 • e/TCS1602
Using the Evaluation Boards
Each of the three evaluation boards is capable of
protecting two signal lines. In a typical application, the
ESD protection internal to the IC being protected will
provide a path for the current owing through the HSP
device. In cases where the internal ESD protection is
not robust enough, a second TVS diode must be added
to the IC side of the HSP. In transformer coupled
dierential signal applications where the transformer
provides protection against common mode transients,
the two TVS diodes on the board can be replaced with
a single TVS diode placed across the signal lines. e
pad spacing was designed to accommodate placing a
diode in a SOD323 package between the signal lines
(see gure 2). e I/O pads are sized to accommodate
gauge 24 or higher wire sizes.
Figure 4 TCS™ HSP Surge Test Circuit
Figure 5 Figure 6Surge Performance Surge Performance (Zoomed In)
TCS-DL004-250-WH
