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Optimise current-limiting solutions for USB 3.0

Posted: 17 Apr 2009     Print Version  Bookmark and Share

Keywords:USB 3.0  polymeric positive temperature coefficient  PPTC 

Along with transfer speed enhancement in USB 3.0, the requirement for power supply is also increased to meet various peripheral demands. The article introduces the polymeric positive temperature coefficient (PPTC) device, which is an over-current protection device often used in the industry, and compares it with low-voltage solid-state switch for USB 3.0 applications. It also looks at power delivery in USB 3.0, and differences compared to USB 2.0 are explained, along with how PPTC devices can be used for over-current protection.

USB 3.0 has a need for speed and a need for power. As the USB 3.0 specification was finalised last November, not only did the transfer speed increase to a blazing 5.0Gbps, but the power budget was also boosted from 500mA to 900mA. The increase in speed and power brings new challenges to both the system and component level, from integrating new data-transfer protocols and new power-management schemes, to successfully transferring data between host and device.

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