Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A3959SB and A3959SLB
Edited by the Electronicstalk Editorial
Team on 31 October 2001
PWM motor drivers provide up to 3A
Allegro MicroSystems has introduced a new range of DMOS full-bridge pulsewidth modulated (PWM) motor driver integrated circuits.
Allegro MicroSystems has introduced a new range of DMOS full-bridge pulsewidth modulated (PWM) motor driver integrated circuits The A3959SB and A3959SLB are designed for the PWM current control of DC motors, and are capable of output currents of up to +/-3A and operating voltages of up to 50V
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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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 270mohm.
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 (package suffix B), and a 24-lead plastic SOIC with a copper batwing tab (package suffix LB).
In both cases, the power tab is at ground potential and needs no electrical isolation.
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