Other Parts Discussed in Thread: DRV8320, DRV8350F, DRV8350R, LM5008A, DRV8353F
I'm implementing a motor controller with a DRV8320, that needs a STO functionality. So far, the controller has
a structure like this:
Next to the enable pin and deactivating the PWM signals, a relay is used to power off the high side MOSFET drain voltage. The problem with this is, that
I cannot place too much capacitive load next to the MOSFETs and that leads to more ringing and further I am bounded
with the maximum current without getting to large in size with the relay.
So I found this paper from TI, that explains the implementation of a STO:
So from there, it should already be enough to deactivate the PWM aswell as disable the enable pin, right? So if this STO is enough,
there should be no need for a relay at all. If not, then I would like to put the relay on the DRV8320 driver power stage,
such that I can switch this low power device instead of the MOSFETs.
One more question about the DRV8320 I have is, what happens when I remove the power VDRAIN. Does the driver itself pulldown the gate driver outputs?