DRV8411 datasheet(13/53 Pages) TI

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Forward

Reverse

OUT1

OUT2

Forward drive

Slow decay (brake)

OUT1

OUT2

Reverse drive

Slow decay (brake)

3 High-Z (coast)

Figure 9-1. H-Bridge Current Paths

When an output changes from driving high to driving low, or driving low to driving high, dead time is automatically

inserted to prevent shoot-through. The tDEAD time is the time in the middle when the output is High-Z. If the

output pin is measured during tDEAD, the voltage depends on the direction of current. If the current is leaving the

pin, the voltage is a diode drop below ground. If the current is entering the pin, the voltage is a diode drop above

VM. This diode is the body diode of the high-side or low-side FET.

The propagation delay time (tPD) is measured as the time between an input edge to output change. This time

accounts for input deglitch time and other internal logic propagation delays. The input deglitch time prevents

noise on the input pins from affecting the output state. Additional output slew delay timing accounts for FET turn

on or turn off times (tRISE and tFALL).

Figure 9-2 below shows the timing of the inputs and outputs of the motor driver.

IN1 (V)

IN2 (V)

OUT1 (V)

tDEAD

tFALL

tPD

OUT2 (V)

tDEAD

tRISE

tPD

tDEAD

tRISE

tPD

tDEAD

tFALL

tPD

Figure 9-2. H-Bridge Timing Diagram

www.ti.com

DRV8411A

SLVSGI9A – OCTOBER 2022 – REVISED JULY 2023

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