Power brown-out on NUCLEO-H755 at max clock (480 MHz)??

[paatx]

Has anyone else experienced a power supply brown-out/crash when running the NUCLEO-H755 (or any other NUCLEO) at the maximum clock speed with quite a few peripherals enabled?  I am suspicious that the 5V/0.5A power provided by USB is not enough to power everything at full speed when using both cores, 100Mb ethernet, and various counters and serial interfaces.  Reducing the clock to 400 MHz seems to resolve the issue.

From looking at the board schematics, it appears that using the 5V EXT power supply input will feed the main 3.3V LDO regulator directly which supports 1300mA of current.  However, I don't think this LDO can handle the additional thermal power loss (1.7V x 1300mA =~2.2 Watts of heat) without adding a large heat sink...

[TDK]

Nothing on the board will pull 1.3 A.

The user manual lists all the powering options. Max allowed is 800 mA through VIN.

USB connector is limited to 500 mA.

If you try to draw more, you will eventually either brown out or thermally limit somewhere.