SLLSFC6B November 2021 – July 2022 ISOUSB111
Decoupling capacitors are placed next to ISOUSB111 according to the recommendations provided in the Power Supply Recommendations section. Note that the USB standard requires that, for a peripheral, the total capacitor value on VBUS, including any decoupling capacitors reflected from the secondary side through the isolated DC-DC converter, must be less than 10-μF. A 100-nF capacitor is recommended close to the VBUS pin to handle tranisent currents.
ESD diodes with low capacitance and low dynamic resistance, such as PESD5V0C1USF, may be placed on D+ and D- lines. A ferrite bead, with dc resistance less than 100 mΩ, may be optionally placed between VBUS pin of the connector and the VBUS pin of ISOUSB111, as shown in the figure, to suppress transients such as ESD.