A3948屬于集成電路（IC）的電機驅動器控制器。由Allegro MicroSystems制造生產的A3948電機驅動器，控制器產品屬于電機驅動器和控制器電源管理集成電路 (PMIC) 系列，可用于控制或操作從某電源施加到電機或相關機電執(zhí)行器的電源。所實現的具體功能和特性集根據預期負載和預期應用的特性有很大差異，范圍從用于有刷電機的簡單開環(huán)速度控制到基于步進電機的高級閉環(huán)運動控制。

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