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26 2024-08

　　Application of PPTC self recovery fuse in USB 3.0

　　With the continuous improvement of high-tech, peripheral devices are also constantly being updated. In terms of USB applications, USB3.0 not only improves speed, but also enhances power supply. Introduce the commonly used overcurrent protection component polymer positive temperature coefficient thermistor (PPTC) in the industry, and compare its differences with low-voltage semiconductor switches in the application of USB 3.0.

　　In addition, we will propose suggestions for the application of USB 3.0 overcurrent protection PPTC components based on the differences between USB 3.0 and USB 2.0, and use the new generation of thin low resistance surface adhesive PPTC components as an example to illustrate the development process of new conductor materials. By using new materials, good overcurrent protection can be provided for current ultra-thin electronic products.

　　Due to the increasing demand for speed and power in electronic products, since the USB 3.0 specification was finalized in November last year, in addition to increasing the speed to 5Gbps, the requirement for power supply has also been raised from 500mA to 900mA. Whether on the system or component side, new speeds and power bring new challenges. New specifications cover new data transmission protocols, power management architectures, and ensure successful data transmission between hosts and devices. However, the only thing that hasn't changed in these USB 3.0 upgrades is the requirements for safety regulations. System engineers now need to allocate sufficient power to these ports and carefully integrate the 'overcurrent protection' function.

　　At present, the design of I/O ports usually includes integrated power lines that directly supply power to peripheral devices or provide power to read data from EEPROM in the device end. In order to prevent short circuits in an unconnected state or overcurrent caused by abnormal conditions after connecting the device, these power pins need to be well protected. PPTC is one of the components that is very suitable for providing this type of protection and has become mainstream in electronic design, meeting various regulatory or safety requirements, such as UL 60950.