DRV8432: Maximum DC Bus Voltage Vs (abs/max)

Hi,

There is a small confusion on the maximum safe voltage for using this IC. Its datasheet mentions 70 V. However, its evaluation board recommends 52.5 V only. What limits the evaluation board not to be used upto or near the maximum voltage? please. In my application, the DC bus voltage is 61 V. I want to use this IC to driver stepper motors. or please advise if that is possible. Also, please recommend a change, which may extend the operation of evaluation board to 61 V. Thank you.