1 Introduction

For USB type C the USB-PD (power delivery) specification is a rather new and powerful extension. The benefits of USB-C are not only the small and reversible connector, but also the wide range of connections that can be substituted by USB-C. Not only USB 2 and USB 3 can be used, but also DisplayPort, Thunderbold or PCIe. Together with USB-PD a total power of 100 W can also be transferred. This makes it a good interface for smartphones, Laptop PCs and in addition for cameras and industrial PCs.

To achieve the high power levels, USB-C PD supports multiple voltage levels. Beside the well-known standard from legacy USB ports of 5 V any voltage up to 20 V is supported. With USB-PD PPS (Programmable Power Supply) the output voltage of a source can be programmed by the connected sink in 20 mV steps. This enables simplification and heat reduction in the connected sink.