DRV8846 Driver Datasheet

DRV8846 Datasheet PDF, Equivalent


Part Number

DRV8846

Description

Dual H-Bridge Stepper Motor Driver

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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DRV8846
SLLSEK2A – JUNE 2014 – REVISED MARCH 2017
DRV8846 Dual H-Bridge Stepper Motor Driver
1 Features
1 PWM Microstepping Motor Driver
– Built-In Microstepping Indexer
– Up to 1/32 Microstepping
– Step/Direction Control
• Multiple Decay Modes
– AutoTune™ Technology
– Mixed Decay
– Slow Decay
– Fast Decay
• Configurable Off-Time PWM Chopping
– 10-, 20-, or 30-μs Off-Time
• Adaptive Blanking Time for Smooth Stepping
• 4- to 18-V Operating Supply Voltage Range
• 1.4-A (Full Scale (Max Drive) Current per H-
Bridge (at 25°C)
• Low-Current Sleep Mode
• 3-Bit Torque DAC to Scale Motor Current
• Thermally Enhanced Surface Mount Package
• Protection Features
– VM Undervoltage Lockout (UVLO)
– Overcurrent Protection (OCP)
– Thermal Shutdown (TSD)
– Fault Condition Indication Pin (nFAULT)
2 Applications
• Printers
• Scanners
• Video Security Cameras
• Projectors
3 Description
The DRV8846 provides a highly-integrated stepper
motor driver for cameras, printers, projectors, and
other automated equipment applications. The device
has two H-bridges and a microstepping indexer and
is intended to drive a bipolar stepper motor. The
output block of each H-bridge driver consists of N-
channel and P-channel power MOSFETs configured
as full H-bridges to drive the motor windings. The
DRV8846 is capable of driving up to 1.4-A full-scale
output current (with proper heatsinking and TA =
25°C).
A simple STEP/DIR interface allows easy interfacing
to controller circuits. Pins allow configuration of the
motor in full-step up to 1/32-step modes. Decay mode
is configurable so that AutoTune, slow decay, fast
decay, and mixed decay can be used. The PWM
current chopping off-time can also be selected. A low-
power sleep mode is provided which shuts down
internal circuitry to achieve very-low quiescent current
draw. This sleep mode can be set using a dedicated
nSLEEP pin.
Internal protection functions are provided for UVLO,
overcurrent protection, short circuit protection, and
overtemperature. Fault conditions are indicated via a
nFAULT pin.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DRV8846
VQFN (24)
4.00 × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
4 to 18 V
STEP/DIR
Step size
Decay Mode
nFAULT
DRV8846
1A
Stepper
Motor Driver
1/32 µstep
1A
M
+t
1
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.

DRV8846
DRV8846
SLLSEK2A – JUNE 2014 – REVISED MARCH 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements ................................................ 6
6.7 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 21
8 Application and Implementation ........................ 22
8.1 Application Information............................................ 22
8.2 Typical Application ................................................. 22
9 Power Supply Recommendations...................... 25
10 Layout................................................................... 25
10.1 Layout Guidelines ................................................. 25
10.2 Layout Example .................................................... 25
11 Device and Documentation Support ................. 26
11.1 Documentation Support ........................................ 26
11.2 Receiving Notification of Documentation Updates 26
11.3 Community Resources.......................................... 26
11.4 Trademarks ........................................................... 26
11.5 Electrostatic Discharge Caution ............................ 26
11.6 Glossary ................................................................ 26
12 Mechanical, Packaging, and Orderable
Information ........................................................... 26
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (June 2014) to Revision A
Page
• Changed references of adaptive decay to AutoTune ............................................................................................................ 1
• Updated Description .............................................................................................................................................................. 1
• Changed Handling Ratings table to an ESD Ratings table and moved Tstg to Absolute Maximum Ratings ........................ 4
• Changed references of rms current to full-scale current and changed the maximum current from 1 to 1.4 A
throughout the document........................................................................................................................................................ 4
• Updated the RDS(ON) units and VHYS in the Electrical Characteristics ..................................................................................... 5
• Changed changed the nENBL setting from 0 to 1 in the Micro-Stepping Indexer section................................................... 10
• Added more information regarding the ADEC pin ............................................................................................................... 18
• Updated the Device Functional Modes ............................................................................................................................... 21
• Added the Documentation Support, Receiving Notification of Documentation Updates, and Community Resources
sections................................................................................................................................................................................. 26
2 Submit Documentation Feedback
Product Folder Links: DRV8846
Copyright © 2014–2017, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity DRV8846 SLLSEK2A – JUNE 2014 – REVISED MARCH 2017 DRV8846 Dual H-B ridge Stepper Motor Driver 1 Features •1 PWM Microstepping Motor Driver – Built-In Microstepping Indexer – Up to 1/32 Microstepping – Step/Directio n Control • Multiple Decay Modes – AutoTune™ Technology – Mixed Decay – Slow Decay – Fast Decay • Confi gurable Off-Time PWM Chopping – 10-, 20-, or 30-μs Off-Time • Adaptive Bl anking Time for Smooth Stepping • 4- to 18-V Operating Supply Voltage Range • 1.4-A (Full Scale (Max Drive) Curre nt per H- Bridge (at 25°C) • Low-Cur rent Sleep Mode • 3-Bit Torque DAC to Scale Motor Current • Thermally Enha nced Surface Mount Package • Protecti on Features – VM Undervoltage Lockout (UVLO) – Overcurrent Protection (OCP ) – Thermal Shutdown (TSD) – Fault Condition Indication Pin (nFAULT) 2 App lications • Printers • Scanners • Video Security Cameras • Projectors 3 Description The DRV8846 provides a highly-.
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