Product category: Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A3968 Series
Edited by the Electronicstalk Editorial Team on 18 April 2002
Dual full-bridge motor
driver ICs feature brake
New from Allegro MicroSystems Europe, the A3968 Series is a range of dual full-bridge PWM motor driver integrated circuits featuring a brake function
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Each device is designed to control two DC motors bidirectionally, and includes two H-bridges capable of continuous output currents of +/-650mA and operating voltages to 30V. Motor winding current can be controlled by internal fixed-frequency, pulsewidth-modulated (PWM), current-control circuitry.
The peak load current limit is set by the user's selection of a reference voltage and current-sensing resistors.
The fixed-frequency pulse duration is set by a user-selected external RC timing network.
The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current-control circuitry during switching transitions.
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To reduce on-chip power dissipation, the H-bridge power outputs have been optimised for low saturation voltages.
The sink drivers feature Allegro's patented Satlington output structure.
The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington.
For each bridge, the two input terminals determine the load current polarity by enabling the appropriate source and sink driver pair.
When a logic low is applied to both inputs of a bridge, the braking function is enabled.
In brake mode, both source drivers are turned 'off' and both sink drivers are turned 'on', thereby dynamically braking the motor.
When a logic high is applied to both inputs of a bridge, all output drivers are disabled.
Special power-up sequencing is not required.
Internal circuit protection includes thermal shutdown with hysteresis, ground-clamp and flyback diodes, and crossover current protection.
Two package styles are available: the A3968SA is supplied in a 16-pin dual-inline plastic package, while the A3968SLE is supplied in a 16-lead plastic SOIC package with copper heatsink tabs.
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