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Yes, you can potentially drive a unipolar stepper motor with the DRV8711. For unipolar steppers, I would also suggest you take a look at the following devices: DRV8803, DRV8804, DRV8805, and DRV8806.
Ok, but hold on for second! In the AN Rick suggests there is a schematic where the voltage on DRV8711 is decreased to 12V. The DRV8711 says it can run up to 58V. Do I always have to decrease the DRV8711 supply voltage to 12V and use the original voltage to drive the bridge?
The voltage in the AN was decreased to 12V because only the low side FETs are controlled. The xHS1 and xHS2 high side gate outputs are reduced with a voltage divide to control the low side FETs. The DRV8711 can be powered at the higher voltage, but it does not make sense to do so with this configuration.
To control a unipolar motor without the external circuits requires connection the unipolar motor in a bipolar configuration. Then you can use the higher voltage.
