Texas Instruments DRV8421 Bedienungsanleitung

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DRV8421 18V 2A Dual H-Bridge Stepper Driver

1 Features

•Dual H-Bridge Motor Driver

–Single/Dual Brushed DC

–Stepper

–Solenoids

•4 to 18V Operating Supply Voltage Range

•Low ON-resistance: HS + LS = 900mΩ (Typical,

25°C)

•High Output Current per H-Bridge

–2A Maximum Driver Current at 12V and T

A

=

25°C

–Parallel Mode Available Capable of 4A

Maximum Driver Current at 12V and T

A

= 25°C

•Device versions:

–DRV8421A (4-wire input): Independent Half

Bridge Control

–DRV8421B (2-wire input): Sleep Mode, Fault

detect

•Similar LV Stepper Drivers:

–DRV8410: 1.65 to 11V (800mΩ R

DS(ON)

)

–DRV8411: 1.65 to 11V (400mΩ R

DS(ON)

)

–DRV8411A: 1.65 to 11V (400mΩ R

DS(ON)

)

•PWM Control Interface

•Low-Current 3µA Sleep Mode (2-wire input version

only)

•Thermally-Enhanced Surface Mount Package

•Protection Features

–VM Undervoltage Lockout (UVLO)

–Overcurrent Protection (OCP)

–Thermal Shutdown (TSD)

–Fault Condition Indication Pin (nFAULT) (2-wire

input version only)

2 Applications

•Household Appliances

–Printers/Scanners

–Refrigerators

–Vacuum Cleaners

–Clothes Dryer

•General Brushed and Stepper Motors

3 Description

The DRV8421 provides a dual H-bridge motor

driver for home appliances and other mechatronic

applications. The device can be used to drive one

or two DC motors, a bipolar stepper motor, or other

loads. A simple PWM interface allows easy interfacing

to controller circuits.

The output block of each H-bridge driver consists

of N-channel power MOSFETs configured as full H-

bridges to drive the motor windings. The DRV8421

is capable of driving a maximum current of 2A from

each output or 4A in parallel mode (with proper heat

sinking, at 12V and T

A

= 25°C).

The device contains two versions having a 4-wire

input (DRV8421A) or a 2-wire input (DRV8421B). The

2-wire input version (DRV8421B) contains features

like enable and fault detection, while the 4-wire input

version (DRV8421A) can drive four half bridges based

on signals to four input terminals. A low-power sleep

mode is also provided for the 2-wire input version.

It shuts down internal circuitry to achieve very-low

quiescent current draw. This sleep mode can be set

by pulling the enable pin low.

Internal protection functions are provided for UVLO,

OCP, short-circuit protection, and overtemperature.

Fault conditions are indicated by a nFAULT pin in the

DRV8421B, the 2-wire input device.

Device Information

(1)

PART NUMBERPACKAGEPACKAGE SIZE

(2)

DRV8421ADGQHVSSOP (10)3.00mm × 3.00mm

DRV8421BDGQHVSSOP (10)3.00mm × 3.00mm

DRV8421ADFUSSOP (10)3.90mm × 4.90mm

DRV8421BDFUSSOP (10)3.90mm × 4.90mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable

DUAL H-Bridge

Stepper Motor

Driver

Controller

DRV8421

PWM

PWM

4 to 18 V

nFAULT

1 A

1 A

DCM

DCM

(2-wire input only)

Simplified Schematic

DRV8421

SLVSHA4 – JUNE 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspezifikationen