Description

Designed for pulse width modulated (PWM) current control of DC motors, the A3959 is capable of output currents to ±3 A and operating voltages to 50 V. Internal fixed off-time PWM current control timing circuitry can be adjusted via control inputs to operate in slow, fast, and mixed current-decay modes.

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. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.

Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of supply and charge pump, and crossover-current protection. Special power-up sequencing is not required.

Features and Benefits

? ±3 A, 50 V Output Rating

? Low rDS(on) Outputs (270 mΩ, Typical)

? Mixed, Fast, and Slow Current-Decay Modes

? Synchronous Rectification for Low Power Dissipation

? Internal UVLO and Thermal-Shutdown Circuitry

? Crossover-Current Protection

? Internal Oscillator for Digital PWM Timing

A3959SLB-T屬于集成電路（IC） > 電機驅動器，控制器。Allegro MicroSystems制造生產的A3959SLB-T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(xiàn)的具體功能和特性集根據(jù)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。