A3948集成电路（IC）的电机驱动器控制器规格书PDF中文资料

A3948属于集成电路（IC）的电机驱动器控制器。由Allegro MicroSystems制造生产的A3948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。

DMOS FULL-BRIDGE PWM MOTOR DRIVER

Designed for pulse-width modulated (PWM) current control of dc motors, the A3948SB and A3948SLB are capable of continuous output currents to ±1.5 A and operating voltages to 50 V. Internal fixed offtime PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes. Similar devices with outputs rated to ±2 A are available as the A3958SB/SLB.

PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a dc motor with externally applied PWM-control signals. The ENABLE input can be programmed via the serial port to PWM the bridge in fast or slow current decay. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.

FEATURES

■ ±1.5 A, 50 V Continuous Output Rating

■ Low rDS(on) Outputs

■ Programmable Mixed, Fast, and Slow Current-Decay Modes

■ Serial Interface Controls Chip Functions

■ Synchronous Rectification for Low Power Dissipation

■ Internal UVLO and Thermal-Shutdown Circuitry

■ Crossover-Current Protection