A3959SLB-T Datasheet PDF - Allegro MicroSystems

●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