TISP® THYRISTOR SURGE PROTECTORS Bourns Releases New PortNote® Solution and Design Kit for Protecting 12 V and 5 V Ports Riverside, California - 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 the 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: [email protected] 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. 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