Power a microcontroler with a motorcontroller?

I have a motor controller that operates at 10-50V and draws 5A controlling a 3V motor that draws less than 1A.

I had a an idea where I want to try to use a microcontroller to control this set up.

The motor controller has an auxiliary 5V output that can support loads that draw less than 10mA.

If I find a suitable microcontroller, can I use the motor controller to power it? Should I use the motor controller to power it?

More info: I am working on a design for a robot build. My system currently has two motors one that runs at 48V (and around 3A) and the aforementioned one (3V) both using the same type of motor controller. I’d prefer not to have two power supply lines running, so can I run the smaller motor system on the motor controller powered at 50V? Is that safe? (the motor controller can take a 56V max)

Thank you for reading, any input would be highly appreciated.