Other Parts Discussed in Thread: LM5013
Tool/software:
Hello.
I am using a LM5013 converter to convert an input between 16V and 51V to a 7.4V output to power a servo. I am testing a scenario where the GND of the board is removed. I know this is sketchy territory but it is very important to us.
Please consider the following schematic.
The unwanted behavior is that when you disconnect the GND from the input of the board (J1), the VBAT voltage will appear on the output of the converter (VSERVO). Keep in mind that this voltage is with respect to the GND potential elsewhere in the system, before the cut.
This in itself wouldn't be a problem for the servo's power input, as no current will flow back through the GND lead. However, since this servo has CAN features, it seems to mess the CAN bus. I am guessing it has to do with the fact that the CAN bus operates around 3-5V, whereas the VSERVO net has risen to VBAT voltage levels.
Unfortunately I cannot make changes to the CAN-enabled servo.
Is there a way I can prevent the VBAT voltage leaking to the output, where GND is floating? Thanks for helping out!
