DRV8411 datasheet(24/53 Pages) TI

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10.1.1.1.2.3.3 Half-Stepping Operation with Slow Decay

In this half-stepping mode, the driver achieves the 0-A state using the slow decay control state (known as

"brake mode" for BDC driving). Therefore, the full-bridge operates in one of the three modes (forward, reverse,

or brake/slow-decay mode) to position the rotor half-way between two full-step positions. The slow decay state

allows the current in the motor winding to decay slowly to 0 A. This mode is best-used when half-stepping at

slow speeds and may help to reduce stepper noise and vibration.

The controller applies the PWM input to the AIN1, AIN2, BIN1, and BIN2 pins as shown in Figure 10-4, and the

driver operates in forward, reverse, and brake mode.

Phase

AIN1

AIN2

BIN1

BIN2

AOUT12 FRW

AOUT12 REV

BOUT12 FRW

BOUT12 REV

AOUT12

BOUT12

Time

Figure 10-4. Timing Diagram for Half-Stepping with Slow Decay

10.1.1.1.3 Application Curves

Ch 1 = AIN1, Ch 2 = AIN2, Ch 3 = BIN1, Ch 4 = BIN2, Ch 5 = AOUT12, Ch 6 = BOUT12, Ch 7 = AOUT12

current, Ch 8 = BOUT12 current

DRV8411A

SLVSGI9A – OCTOBER 2022 – REVISED JULY 2023

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DRV8411 Datasheet(PDF) 24 Page - Texas Instruments