DRV8846_15 Datasheet, PDF (9/35 Pages) Texas Instruments – DRV8846 Dual H-Bridge Stepper Motor Driver

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8 Detailed Description
DRV8846
SLLSEK2 – JUNE 2014
8.1 Overview
The DRV8846 is an integrated motor driver solution for bipolar stepper motors. The device integrates 2 H-bridges
that use NMOS low-side drivers and PMOS high-side drivers, current sense regulation circuitry, and a
microstepping indexer. The DRV8846 can be powered with a supply range between 4 to 18 V and is capable of
providing an output current to 1.4-A full scale or 1-A rms.
A simple STEP/DIR interface allows easy interfacing to the controller circuit. The internal indexer is able to
execute high-accuracy microstepping without requiring the processor to control the current level.
The PWM off-time, t_OFF can be adjusted to 10, 20, or 30 μs.
The DRV8846 has an adaptive decay feature that automatically adjusts the decay setting to minimize current
ripple while still reacting quickly to step changes. This feature allows the DRV8846 to quickly be integrated into a
system.
A torque DAC feature allows the controller to scale the output current without needing to scale the analog
reference voltage input VREF. The torque DAC is accessed using digital input pins. This allows the controller to
save power by decreasing the current consumption when not required.
A low-power sleep mode is included, which allows the system to save power when not driving the motor.
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