Stm32 Nucleo 767zi power on issue at 12V Vin.

[engrtalhamw]

Hi!

I have an issue with stm32 Nucleo F767zi power setup.

When I power up the stm32 Nucleo F767zi on 12V, the regulator ic and the controller chip heats up. Why?

I have also changed the JP3 jumper to (Vin-5V) option. And the JP1 jumper is off.

What's the problem and how I can resolve it?

[TDK]

> When I power up the stm32 Nucleo F767zi on 12V, the regulator ic and the controller chip heats up. Why?

Chips heat up when they dissipate power. LDOs in particular can heat up a lot as the energy lost from dropping 12V, or whatever, down to the target voltage can be significant.

> What's the problem and how I can resolve it?

This is the expected behavior. There is no problem to solve. Nucleo boards are not built to be power efficient, especially with 12V power input.

[engrtalhamw]

I accept this but I m using it in a Robot. here I need to provide external power to stm. But the issue is when I power stm with 5V the my robot hydraullic setup doesn't work. And this hydraullic setup controls the robot's arm.

[TDK]

You'll have to architect the system to have a stable power scheme. The nucleo board has a variety of ways to be powered. Using 5 V seems like the best to me in general.

If you can provide 12 V, and you can live with the power loss / inefficiencies, that is also a possibility.

Ensure you have a common ground in the system. Note that USB can cause unexpected ground loops and it can tie ground to earth ground.