12V 5V Power Port Protection PortNote and Design Kit

12 V & 5 V Power
Port Protection
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
-18 A
0.0 ms
PN-DESIGNKIT-52
0.3 ms
0.6 ms
0.9 ms
1.2 ms
1.5 ms
1.8 ms
Americas: Tel +1-951 781-5500
EMEA:
Tel +36 88 520 390
Fax +36 88 520 211
Fax +1-951 781-5700
Asia-Pacific: Tel +886-2 256 241 17
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.
Fax +886-2 256 241 16
COPYRIGHT© 2016 • BOURNS, INC. • 3/16 • 3M/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.
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.
Bourns® PortNote® solutions provide protection
recommendations for typical port threats.
For more information, go to:
www.bourns.com
or email: [email protected]
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