Usb 2.0 Common Mode Chokes; Figure 19: Usb 2.0 Good Downstream Power Connection; Figure 20: Usb 2.0 A Common Mode Choke - Advantech SOM-5992 Design Manual

Figure 19 : USB 2.0 Good Downstream Power Connection

2.7.2.3 USB 2.0 Common Mode Chokes

Testing has shown that common mode chokes can provide required noise attenuation. A design should
include a common mode choke footprint to provide a stuffing option in the event the choke is needed to
pass EMI testing. Below figure shows the schematic of a typical common mode choke and ESD
suppression components. Place the choke as close as possible to the USB connector signal pins.
Figure 20 : USB 2.0 A Common Mode Choke
７２