Application of Type-C Thermistor for Overcurrent Protection.10a mini blade fuse

　　USB Type-C (hereinafter referred to as Type-C) is the latest standard for USB connectors. There is no distinction between positive and negative sides, and the data transmission speed can reach up to 10Gbits/second (Gbps), supporting "USB Power Delivery (PD)" power supply. However, as the charging current increases, the likelihood of accidents such as abnormal heating and burning of connectors also increases. So in order to prevent such accidents from happening, it is necessary to equip the TYPE-C with an overcurrent protection element - PPTC thermistor, also known as the PPTC self recovery fuse.

　　PPTC is a component that blends carbon into a polymer resin and sandwiches it between metal foils. In normal working conditions, the resistance of PPTC components is much lower than other components in the circuit. Under overcurrent, the resistance of the components increases (acts), thereby reducing the current in the circuit to a value that other circuit components can safely carry. This change is caused by I ² The result of the rapid rise in component temperature caused by the R heating principle.

　　When the current increases and the temperature rises abnormally, the carbon molecular bonds break and the PPTC resistance increases, which can prevent large currents from flowing into the connector.

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