Allegro A4982 DMOS微型步进马达驱动方案
Allegro公司的A4982是集成了电平转换和过流保护的微型步进马达驱动器,适用于双极步进马达驱动,工作在全步进,半步进,1/4步进和1/6步进模式,输出驱动能力高达35V和±2 A. A4982包括固定的离线电流调节器,兼容3.3V和5V逻辑,睡眠模式电流小于10 μA.本文介绍了A4982主要特性和优势, 功能方框图, 典型应用框图以及LP和ET封装的应用电路和PCB布局框图.
DMOS Microstepping Driver with Translator and Overcurrent Protection
The A4982 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A.
The A4982 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes. The ET package meets customer requirements for no smoke no fire (NSNF) designs by adding no-connect pins between critical output, sense, and supply pins. So, in the case of a pin-to-adjacent-pin short, the device does not cause smoke or fire. Additionally, the device does not cause smoke or fire when any pin is shorted to ground or left open.
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