Optimization of current-limiting solutions for USB 3.0

By Chun-Pai Hsieh and Ching-Han Yu, Polytronics Technology Corp., Taiwan
Planet Analog (Apr 06, 2009)

Abstract
In addition to 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.

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