A3972中文资料双DMOS全桥PWM微电机驱动器数据手册Allegro规格书

描述 Description

This part is discontinued. Samples are no longer available. Date of status change: June 1, 2016.

Recommended substitution: A3992SLPTR-T.

Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, the A3972SB is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.

The desired load-current level is set via the serial port with two 6-bit linear DACs in conjunction with a reference voltage. The six bits of control allow maximum flexibility in torque control for a variety of step methods, from microstepping to full step drive. Load current is set in 1.56% increments of the maximum value.

Synchronous rectification circuitry allows the load current to flow through the low rDS(on) of the DMOS output driver during the current decay. This feature will eliminate the need for external clamp diodes in most applications, saving cost and external component count, while minimizing power dissipation.

Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. Special power-up sequencing is not required.

特性 Features

• ±1.5 A, 50 V Continuous Output Rating
• Low rDS(on) DMOS Output Drivers
• Optimized Microstepping via 6-Bit Linear DACs
• Programmable Mixed, Fast, and Slow Current-Decay Modes
• 4 MHz Internal Oscillator for Digital Timing
• Serial-Interface Controls Chip Functions
• Synchronous Rectification for Low Power Dissipation
• Internal UVLO and Thermal Shutdown Circuitry
• Crossover-Current Protection
• Precision 2 V Reference
• Inputs Compatible with 3.3 V or 5 V Control Signals
• Sleep and Idle Modes

简介

A3972属于集成电路（IC）的电机驱动器控制器。由制造生产的A3972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。