TI DRV8846 3D打印机马达控制器参考设计
TI公司的DRV8846是高度集成的步进马达驱动器,包括两个H桥和微步进分度器,工作电压4-18V,驱动电流高达1A,主要用在打印机,扫描仪,视频安全摄像机和投映仪.本文介绍了DRV8846主要特性,功能框图,应用电路以及评估板主要特性,电路图和材料清单,以及3D打印机控制器(12V)主要特性,电路图和材料清单.
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 TA = 25℃).
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.
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