SLVAF82B August   2022  – January 2024 ESD122 , ESD204 , ESD224 , ESD2CANXL24-Q1 , ESD321 , ESD341 , ESD401 , ESD441 , ESD751 , ESD752 , ESDS302 , ESDS304 , ESDS312 , HD3SS3220 , SN65240 , TPD1E01B04 , TPD1E01B04-Q1 , TPD1E04U04 , TPD1E05U06 , TPD1E05U06-Q1 , TPD1E0B04 , TPD1E10B06 , TPD1E10B06-Q1 , TPD1E1B04 , TPD1E6B06 , TPD2E001 , TPD2E001-Q1 , TPD2E009 , TPD2E1B06 , TPD2EUSB30 , TPD2S017 , TPD3E001 , TPD4E001-Q1 , TPD4E004 , TPD4E02B04 , TPD4E02B04-Q1 , TPD4E110 , TPD4S009 , TPD6E004 , TPD6E05U06 , TPS65982 , TPS65994AD , TSD05C , TUSB211 , TUSB4020BI , TUSB4041I , TUSB8041 , TVS0500 , TVS1400 , TVS1800 , TVS2200

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Overview
  5. 2 USB 1.1
    1. 2.1 Overview
    2. 2.2 ESD Protection Requirements
    3. 2.3 System Level Design
  6. 3 USB 2.0 Circuit Protection
    1. 3.1 Overview
    2. 3.2 ESD Protection Requirements
    3. 3.3 System Level Designs
  7. 4 USB 5Gbps
    1. 4.1 Overview
    2. 4.2 ESD Protection Requirements
    3. 4.3 System Level Designs
  8. 5 USB 10Gbps
    1. 5.1 Overview
    2. 5.2 ESD Protection Requirements
    3. 5.3 System Level Designs
  9. 6 USB 20Gbps
    1. 6.1 Overview
    2. 6.2 ESD Protection Requirements
    3. 6.3 System Level Designs
  10. 7 USB Type-C® Protection
    1. 7.1 Overview
    2. 7.2 ESD Protection Requirements
    3. 7.3 System Level Designs
  11. 8 USB Power Delivery (USB-PD) Surge Protection
    1. 8.1 Overview
    2. 8.2 VBUS Protection
    3. 8.3 Short to VBUS
  12. 9 References
  13. 10Revision History

8.2 VBUS Protection

As with all power lines, consideration must be taken about how to protect against transient over voltage events. For example, when there is a plug or unplug event while there is current flowing through the cable, inductive ringing can cause a 20V line to temporarily go up to 50V which can damage downstream circuitry. A recommendation to protect the system is to use a protection diode and a key specification to consider is the clamping voltage, confirming the voltage experienced by the system is below the maximum voltage of the system. The TVS2200 is a device that protects a 20V line with a very low clamping voltage. This results in the system seeing a maximum voltage of 28V during a transient event. The plots in Figure 8-1 and Figure 8-2 show the result and benefits of using a TVS device. Also, Table 8-1 shows recommended TVS diodes for USB-PD voltage levels.

Table 8-1 USB-PD VBUS Surge Protection Recommendations
USB-PD Voltage Recommended TVS Surge Clamping Voltage Package | Size
5V TVS0500 9V DRV | 2 × 2 mm
9V TVS1400 18V DRV |2 × 2 mm
15V TVS1800 23V DRV | 2 × 2 mm
20V TVS2200 28V DRV | 2 × 2 mm
28V TVS3300 38V

DRV | 2 × 2 mm

YZF | 1.1 × 1.1 mm
GUID-C22B8D4B-6665-49F7-8AA5-65B8D957462D-low.pngFigure 8-1 USB-PD VBUS Over Voltage Event Without TVS
GUID-FCE61A02-0BDC-46AB-9BE9-D3884625C5E8-low.pngFigure 8-2 USB-PD VBUS Over Voltage Clamped by TVS2200