1. USB 포트를 통해 전원을 공급하는 방법
The board can be powered by the PC via the provided USB port. In this configuration, The board is accessed either as a USB storage drive or via the browser on the PC.
All the power for the board is provided by the PC via the USB cable. In some instances, the PC may not be able to supply sufficient power for the board. In that case, an external 5VDC power supply can be used, but this should rarely be necessary.
2. DC 파워잭을 사용하는 방법
A 5VDC supply can be used to provide power to the board by the DC power jack.
USB와 5VDC 동시 연결시 5VDC 입력을 파워소스로 자동으로 선택한다.
The selection of either the 5VDC or the USB as the power source is handled internally to the TPS65217C and automatically switches to 5VDC power if both are connected. SW can change the power configuration via the I2C interface from the processor. In addition, the SW can read the TPS65217C and determine if the board is running on the 5VDC input or the USB input. This can be beneficial to know the capability of the board to supply current for things like operating frequency and expansion cards. It is possible to power the board from the USB input and then connect the DC power supply. The board will switch over automatically to the DC input.
Referenece : BBB SRM
https://docs.beagleboard.org/latest/boards/beaglebone/black/ch03.html
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