A3955SB-T集成电路（IC）的电机驱动器控制器规格书PDF中文资料

A3955SB-T属于集成电路（IC）的电机驱动器控制器。由Allegro MicroSystems制造生产的A3955SB-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。

描述 Description

The A3955 is designed to drive one winding of a bipolar stepper motor in a microstepping mode. The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50 V. Internal pulse width modulated (PWM) current control combined with an internal three-bit nonlinear digital to-analog converter allows the motor current to be controlled in full-, half-, quarter-, or eighth-step (microstepping) modes. Nonlinear increments minimize the number of control lines necessary for microstepping. Microstepping provides increased step resolution, and reduces torque variations and resonance problems at low speed.

Features and Benefits

▪ ±1.5 A continuous output current

▪ 50 V output voltage rating

▪ Internal PWM current control

▪ 3-bit nonlinear DAC

▪ Fast, mixed fast/slow, and slow current-decay modes

▪ Internal transient-suppression diodes

▪ Internal thermal shutdown circuitry

▪ Crossover-current and UVLO protection