DRV8411 datasheet(12/53 Pages) TI

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9.3 External Components

Table 9-1 lists the recommended values of the external components for the driver.

Table 9-1. DRV8411A External Components

COMPONENT

PIN 1

PIN 2

RECOMMENDED

CVM1

GND

VM-rated capacitor, 10 µF minimum

CVM2

GND

0.1-µF, VM rated ceramic capacitor

RnFAULT

VEXT(1)

nFAULT

Pullup resistor, IOD ≤ 5 mA

RAIPROPI

AIPROPI

GND

Sense resistor, see Section 9.4.2.1 for sizing

RBIPROPI

BIPROPI

GND

Sense resistor, see Section 9.4.2.1 for sizing

(1)

VEXT is not a pin on the DRV8411A, but a pullup resistor on the VEXT external supply voltage is required for the open-drain output,

nFAULT.

9.4 Feature Description

9.4.1 Bridge Control

The DRV8411A has two identical H-bridge motor drivers. The input pins, AINx and BINx, control the

corresponding outputs, AOUTx and BOUTx, respectively. Table 9-2 shows how the inputs control the H-bridge

outputs.

Table 9-2. H-Bridge Control

nSLEEP

xIN1

xIN2

xOUT1

xOUT2

DESCRIPTION

High-Z

Low-power sleep mode

High-Z

Coast/ fast decay; H-bridge disabled to High-Z

Reverse (Current OUT2 → OUT1)

Forward (Current OUT1 → OUT2)

Brake; low-side slow decay

The inputs can be set to constant voltages for 100% duty cycle drive, or they can be pulse-width modulated

(PWM) for variable motor speed. When using PWM, switching between driving (forward or reverse) and slow-

decay states typically works best. For example, to drive a motor forward with 50% of the maximum RPM, IN1 = 1

and IN2 = 0 during the driving period or PWM "on" time, and IN1 = 1 and IN2 = 1 during the PWM "off" time.

Alternatively, the coast mode (IN1 = 0, IN2 = 0) for fast current decay is also available. To PWM using fast decay,

the PWM signal is applied to one xIN pin while the other is held low, as shown below.

Table 9-3. PWM Control of Motor Speed

xIN1

xIN2

DESCRIPTION

PWM

Forward PWM, fast decay

PWM

Forward PWM, slow decay

PWM

Reverse PWM, fast decay

PWM

Reverse PWM, slow decay

Figure 9-1 shows how the motor current flows through the H-bridge. The input pins can be powered before VM is

applied.

DRV8411A

SLVSGI9A – OCTOBER 2022 – REVISED JULY 2023

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