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The USB PD is a standard that increases the maximum DC power supply capacity of 7.5W implemented by the earlier USB standards by a factor of 13 times, to 100W (20V at 5A). With the rapid demand growth for devices using USB charging, the potential for sub-standard and non-compliant USB accessories (e.g., cables) entering the market increases substantially. The need for identifying non-compliant USB products becomes critically important, particularly for the high-power charging designs based on USB PD standards.
