Allegro MicroSystems' new range of DMOS full-bridge pulse-width modulated (PWM) motor driver integrated circuits, the A3959SB and A3959SLB, are designed for current control of DC motors, and are capable of output currents of up to ±3 A and operating voltages of up 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 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. Outputs have a low 'on' resistance of typically 270 mOhm.
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.
The A3959SB/SLB is supplied in a choice of two power packages, a 24-pin plastic DIP with a copper batwing tab (suffix 'B'), and a 24-lead plastic SOIC with a copper batwing tab (suffix 'LB'). In both cases, the power tab is at ground potential and needs no electrical isolation.
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