SLVSAS7D February 2011 – March 2021 DRV8801-Q1
This decay mode is equivalent to a phase change where the FETs opposite of the driving FETs are switched on (2 in Figure 7-1). When in fast decay, the motor current is not allowed to go negative because this would cause a change in direction. Instead, as the current approaches zero, the drivers turn off. See the Section 22.214.171.124 section for an equation to calculate power.