SNVAA91 December   2023 TPSM63610

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1USB Type-C Specifications
  5. 2Avionics USB Type-C PD Design
  6. 3Dynamic Output Voltage Control Method
  7. 4Schematic
  8. 5Lab Measurements
  9. 6Summary
  10. 7References

1 USB Type-C Specifications

For most USB applications, the USB port is used to charge personal electronic devices. With the demand for more processing power comes the need for more power in a highly efficient and thermally cool design. To meet the ever-growing trend of increased maximum power for USB applications, the system end equipment must be designed to accommodate the newly specified USB Type-C 1.2 (15 W) and USB PD 3.0 (100 W) power specifications detailed in Table 1-1 and illustrated in Figure 1-1.

Table 1-1 USB Specification and Maximum Voltage, Current, and Power
SpecificationMaximum voltageMaximum CurrentMaximum Power
USB 2.0 5 V500 mA2.5 W
USB 3.0 and USB 3.15 V900 mA4.5 W
USB BC 1.25 V1.5 A7.5 W
USB Type-C 1.25 V3 A15 W
USB PD 3.020 V5 A100 W
GUID-6A338F20-9EE1-4CF7-AC4F-530F4B4C7DE5-low.jpgFigure 1-1 USB Source Power Demand Progression

The USB Type-C application is then further segmented into different power and data roles as shown in Figure 1-2. This application note focuses on a no data/source only USB Type-C end equipment with the use of a high-efficiency switching DC/DC power module as the intermediary buck design for a well-regulated output voltage rail.

GUID-870FA56F-7CFB-4A6C-831E-167D959C9610-low.jpgFigure 1-2 USB Type-C Application Examples