MICROSTEPPING DMOS DRIVER WITH TRANSLATOR

The A3977xED and A3977xLP are complete microstepping motor drivers with built-in translator. They are designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with output drive capability of 35 V and ±2.5 A. The A3977 includes a fixed off-time current regulator that has the ability to operate in slow-, fast-, or mixed-decay modes. This currentdecay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

The translator is the key to the easy implementation of the A3977. By simply inputting one pulse on the STEP input the motor will take one step (full, half, quarter, or eighth depending on two logic inputs). There are no phase-sequence tables, high-frequency control lines, or complex interfaces to program. The A3977 interface is an ideal fit for applications where a complex µP is unavailable or over-burdened.

FEATURES

■ ±2.5 A, 35 V Output Rating

■ Low rDS(on) Outputs, 0.45 Ω Source, 0.36 Ω Sink Typical

■ Automatic Current Decay Mode Detection/Selection

■ 3.0 V to 5.5 V Logic Supply Voltage Range

■ Mixed, Fast, and Slow Current Decay Modes

■ Home Output

■ Synchronous Rectification for Low Power Dissipation

■ Internal UVLO and Thermal Shutdown Circuitry

■ Crossover-Current Protection

A3977SED-T属于集成电路（IC） > 电机驱动器，控制器。Allegro MicroSystems制造生产的A3977SED-T电机驱动器，控制器产品属于电机驱动器和控制器电源管理集成电路 (PMIC) 系列，可用于控制或操作从某电源施加到电机或相关机电执行器的电源。所实现的具体功能和特性集根据预期负载和预期应用的特性有很大差异，范围从用于有刷电机的简单开环速度控制到基于步进电机的高级闭环运动控制。