Hardware design of USB in bus-powered app.

[ksale.1]

Hi,

Please note my hardware design background is weak. I'm confused between the design in AN4879 and the schematics of STM32H7xxx-Disco, as shown below. Your help is much appreciated.

[gbm]

The upper picture shows the simplified diagram of a bus-powered USB device; the bottom one - dual role host/device without device bus power capability (but capable of supplying the attached device when taking the host role).

[ksale.1]

Thank you @gbm​ , Please advise the attached schematic is good for USB_OTG_FS , Communication Device Class (Virtual Port Comm).

2- In selection of a step-down converter, must the datasheet explicitly states in the Application "USB Power Supplies"?