To meet this demand, the USB Implementers Forum (USB-IF) introduced USB Power Delivery (PD) 1.0 in 2012. A key driver for introducing the standard was to reduce e-waste by offering an interoperable charging standard that would allow manufacturers to offer one charger capable of powering a suite of portable devices.
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Silicon vendors supply solutions that separate PD manager and PD PHY, or combine both functions onto a single-chip. TI, for example, offers the TPS25740, a source controller that includes a gate driver for the VBUS power switch, CC logic, USB PD manager and PD PHY. The chip is USB PD 2.0 compliant and so provides for voltages of 5, 12 and 20 volts, and power output from 15 to 100 watts.
The TPS25740 is a suitable foundation for a DFP solution. It automatically handles discharging the VBUS output. Protection features include overvoltage, overcurrent, over-temperature, and system override to disable the gate driver. 2ff7e9595c
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