SLVSCC0D November 2013 – October 2019 DRV8850
The propagation delay time (tDELAY) is measured as the time between an input edge to an output change. This time is composed of two parts: an input deglitcher and output slewing delay. The input deglitcher prevents noise on the input pins from affecting the output state.
The output slew rate also contributes to the delay time. For the output to change state during typical operation, first one FET must be turned off. The FET gate is ramped down according to the SR resistor selection, and the observed propagation delay ends when the FET gate falls to less than the threshold voltage.