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High-Performance Power ICs and Hall-Effect Sensors
Related Links:
Datasheets:
A3966: Dual Full-Bridge PWM Motor Driver (PDF)
Selection Guides:
Power Integrated Circuits,
Power Motor Drivers,
Power Motor Drivers - Full-Bridge
Technical Publications:
A New, Low-Cost, Dual H-Bridge Motor Driver IC (PDF),
A3966 Timing Diagram (full step),
A3966 Timing Diagram (half step),
A3966 Timing Diagram (modified half step)
FAQs:
3966: Dual Full-Bridge PWM Motor Driver FAQ
Press Releases:
Low Cost, Dual Full-Bridge PWM Motor Driver ICs
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A3966
Dual Full-Bridge PWM Motor Driver
Features
- ±650 mA continuous output current
- 30 V output voltage rating
- Internal fixed-frequency PWM current control
- Satlington® sink drivers
- User-selectable blanking window
- Internal ground-clamp and flyback diodes
- Internal thermal-shutdown circuitry
- Crossover-current protection and UVLO protection
Description
The A3966 is designed to drive both windings of a two-phase bipolar stepper motor. 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, a PHASE input controls load-current polarity by selecting the appropriate source and sink driver pair. For each bridge, an ENABLE input, when held high, disables the output drivers. 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 A3966 is supplied in a 16-lead plastic wide 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.
Typical Application
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3966SA | 16-pin DIP | No | view data | -20 °C to 85 °C | discontinued | samples not available | |
| A3966SLB | 16-lead SOIC | No | view data | -20 °C to 85 °C | discontinued | samples not available | |
| A3966SLB-T | 16-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Contact Local Sales Representative | |
| A3966SLBTR | 16-lead SOIC | No | view data | -20 °C to 85 °C | discontinued | samples not available | |
| A3966SLBTR-T | 16-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Contact Local Sales Representative | |
| A3966ELB-T | 16-lead SOIC | Yes | view data | -40 °C to 85 °C | new | samples not available | |
| A3966ELBTR-T | 16-lead SOIC | Yes | view data | -40 °C to 85 °C | new | Contact Local Sales Representative |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.