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Wouldn't the parallel connection of the two half bridges double the current capacity of the application? Even if the current is not needed, it would be a better use of the silicon inside the part, causing it to run a bit cooler. Just an idea...
I did not mean to say the suggested solution wasn't valid; I just wanted to point out the paralleling of bridges as an alternative and as a way to better utilize the silicon in the device. I think Brian can play with both solutions and decide which one works best.
in my customer application the DRV8873 is being used now for voice coil motor. However since the its package thermal issue, they are considering to use another solution.
DRV8320/50 is a common device for 3ph servo motor in that team, they are just wondering if two of half bridge of DRV8350 can be left disable and only uses one half-Bridge to drive DC motor
Is the customer trying to use the DRV8320/50 for a brushed motor application? If this is the case, they will need an H-bridge which would mean they would need to operate 2 of the half-bridges. Section five of the following FAQ (Quick Guide to Debugging Common Issues in BLDC motor drivers) which talks about this a little more.
