DRV8701: Operating DRV8701 and H-Bridge on Separate Supplies

Part Number:DRV8701

Hey there,

i would like to use the DRV8701 for a commercial project. I have a question regarding the datasheet chapter '7.4.1 Operating DRV8701 and H-Bridge on Separate Supplies - Figure 33. VM Operating Range Based on Motor Supply Voltage' (Page 27).

In my application I may have have the situation that the battery supply (vbat) drops below 10V but the DRV8701 supply (VM) will remain at 24V. ( I know that i have to connect the IDRIVE Pin to AVDD to disable the high side OCP for situations when VM is >> VBAT).

But this situation described above (VBAT < 10V, VM = 24V) would still be outside the "allowable area" in your figures. My question is: what will happen in that specific case? Will it damage the DRV8701 or will it simply disable the high side?

In my application it won't be necessary that the high side FETs work in this situation. Its only a turn off situation and only the low side FETs should work to keep the connected coil shortet to ground to avoid self induction.

Thanks a lot in advance.