TISP® THYRISTOR SURGE PROTECTORS
ADVANCE NOTICE
Bourns Releases New PortNote® Solution and Design Kit
for Protecting 12 V and 5 V Ports
Riverside, California - TO BE RELEASED MAY 3, 2016 Bourns is pleased to announce the release of the 12 V and 5 V
Power Port Protection PortNote® Solution and Design Kit.
12 V & 5 V Power
Port Protection
IEC 60335-1 (Safety Household Appliances) clause 19.11.1
as well as IEC 60730-1 clause H.27.1 (Automatic Controls)
both define low power circuits and abnormal operations for
fault conditions. This PortNote® Solution describes a solution
to the problem of overheating during short circuit testing of
low power circuits with 12 V and 5 V ports. The solution
consists of the use of Bourns® Model TISP4 Series
Thyristors with breakover voltages of 25 V and
15 V, respectively.
Solution Products
TISP4025H1BJR-S
TISP4015H1BJR-S
Objective
Solution
Power supply safety testing in consumer applications
is simplified if circuits are split into sub-circuits of
15 W. A low power circuit is defined by IEC 60335-1
and IEC 60730-1 as such when it generates a
maximum of 15 W between its input and output
ports. Under abnormal conditions such as an
overload, the temperature rise cannot exceed
those in table 3 of IEC 60335. For example, Class
B transformer windings may not overheat by more
than 95 ˚C. The internal overcurrent protection
in power supply controllers may not be sensitive
enough to the increase in power demand caused
by a test such as the bypassing of one low power
circuit as shown below, causing the transformer to
overheat. The Model TISP4025H1BJ has a rated
voltage of 13 V and will breakover at a maximum of
25 V with a rate of change of current of 0.8 A/ms.
1 Single Bidirectional Thyristor Surge
Protector: TISP4025H1BJR-S
or
1 Single Bidirectional Thyristor Surge
Protector: TISP4015H1BJR-S
Compliance*
IEC 60335-1,
IEC 60730 (low power circuit test)
Alternate Recommendations
1 TISP4030H1BJR-S
Benefit
Helps designer pass short circuit test of
power supply
small format (SMB package)
26 - 30 V Short Circuit to LOAD
12 V
26 - 30 V
*The Bourns® model TISP4xxxH1BJR-S helps ensure an
application’s compliance to IEC 60335 and IEC 60730 by
forcing the over current protection to shut down the power
supply during a short circuit event, preventing the circuit
from overheating.
LOAD
TISP4025H1BJ
14 V
0A
13 V
Design Kit
-2 A
12 V
11 V
-4 A
10 V
-6 A
9V
8V
-8 A
7V
-10 A
6V
5V
-12 A
4V
-14 A
3V
2V
-16 A
1V
0V
PN-DESIGNKIT-52
The new PortNote® Solution and Design Kit
are available on Bourns website at www.bourns.com.
PortNote® Solution
Design Kit
12 V and 5 V Power
Port Protection
PN-DESIGNKIT-52
-18 A
0.0 ms
0.3 ms
0.6 ms
Americas:
EMEA:
Tel +36 88 520 390
Fax +36 88 520 211
Asia-Pacific:
0.9 ms
1.2 ms
1.5 ms
1.8 ms
2.1 ms
2.4 ms
2.7 ms
3.0 ms
The schematic shown here illustrates the application
protection and does not constitute the complete circuit
design. Customers should verify actual device performance
in their specific applications.
Tel +1-951 781-5500
Fax +1-951 781-5700
Bourns® PortNote® solutions provide protection
recommendations for typical port threats.
Tel +886-2 256 241 17
Fax +886-2 256 241 16
For more information, go to:
www.bourns.com
or email: protection@bourns.com
COPYRIGHT© 2016 • BOURNS, INC. • 3/16 • e/TSP1604 • “PortNote” is a registered service mark of Bourns, Inc.
“Bourns” and “TISP” are registered trademarks of Bourns, Inc. in the U.S. and other countries.
Components Included
IEC 60335-1 (Safety Household Appliances) clause
19.11.1 as well as IEC 60730-1 Clause H.27.1 (Automatic
Controls) both define low power circuits and abnormal
operations for fault conditions. Model TISP4025H1BJ has
been tested on a 12 V port short circuited to a 26 V bus
successfully. However, different loads and different output
capacitors may affect the rise time and breakover voltage of
the TISP® device. It is recommended that the customer test
the device in their application.
TISP4025H1BJR-S
Quantity
5
TISP4015H1BJR-S
5
TSP1605