DRV8846 Texas instruments

DRV8846

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DRV8846

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Описание

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 smart tune, 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.

PWM Microstepping Motor Driver
- Built-In Microstepping Indexer
- Up to 1/32 Microstepping
- Step/Direction Control
Multiple Decay Modes
- Smart tune 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)

Number of full bridges	2
Vs (min) (V)	4
Vs ABS (max) (V)	20
Full-scale current (A)	1
Peak output current (A)	2
RDS(ON) (HS + LS) (mΩ)	900
Sleep current (µA)	1.2
Control mode	STEP/DIR
Control interface	Hardware (GPIO)
Microstepping levels	32
Features	Current Regulation, Smart Tune
Rating	Catalog
Operating temperature range (°C)	-40 to 85