DRV8846_15 Datasheet, PDF (1/35 Pages) Texas Instruments – DRV8846 Dual H-Bridge Stepper Motor Driver

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DRV8846 Dual H-Bridge Stepper Motor Driver
DRV8846
SLLSEK2 – JUNE 2014
1 Features
•1 PWM Microstepping Motor Driver
– Built-In Microstepping Indexer
– Up to 1/32 Microstepping
– Step/Direction Control
• Multiple Decay Modes
– Adaptive Decay
– 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-A Continuous/RMS Output 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-A full scale
output current (with proper heatsinking and T_A =
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 adaptive decay, 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
QFN (24)
4.00 × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
4 to 18 V
STEP/DIR
Step size
Decay Mode
nFAULT
DRV8846
1A
Stepper
Motor Driver
1A
1/32 µstep
M
+J
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.