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A3967SLPTR-T, A3968, A3968ELB

Table of contents:
Info of A3967SLPTR-T
Info of A3968
Info of A3968ELB

A3967SLPTR-T, A3968, A3968ELB Selling Leads, Datasheet

MFG:ALLEGRO Package Cooled:SOP-24 D/C:09+

A3967SLPTR-T, A3968, A3968ELB Datasheet download

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Part Number: A3967SLPTR-T

MFG: ALLEGRO

Package Cooled: SOP-24

D/C: 09+

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A3968 General Description

The A3968 bidirectionally controls two DC motors. The device includes two full-bridges capable of continuous output currents of ±650 mA and operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated (PWM), current-control circuitry. The peak load current limit is set by user 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.

To reduce on-chip power dissipation, the full-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the Allegro® 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 INPUTA and INPUTB 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.

The A3968 is supplied in a 16-lead plastic SOIC with two pins internally fused to the die pad for enhanced thermal dissipation. These pins are at ground potential and need no electrical isolation. The device is lead (Pb) free, with 100% matte tin leadframe plating.

A3968 Maximum Ratings

±650 mA continuous output current
30 V output voltage rating
Internal fixed-frequency PWM current control
Satlington® sink drivers
Brake mode
User-selectable blanking window
Internal ground-clamp and flyback diodes
Internal thermal-shutdown circuitry
Crossover-current protection and UVLO protection

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