The A3966SA and A3966SLB are dual full-bridge PWM motor drivers designed to drive both windings of a two-phase bipolar stepper motor. Each device includes two H-bridges capable of continuous output currents of +650 mA and operating voltages up to 30 V. Motor winding current is controlled by internal fixed-frequency pulse-width modulated (PWM) current-control circuitry.
| Continuous Output Current | +650 mA |
|---|---|
| Output Voltage Rating | 30 V |
| Logic Supply Voltage Range | 4.75 V to 5.5 V |
| Operating Temperature Range | -20°C to +85°C |
| Thermal Shutdown Temp. | 165°C |
| PWM RC Frequency | 22.9 kHz to 27.9 kHz |
The peak load current limit is set by the user's selection of a reference voltage and current-sensing resistors.
No, special power-up sequencing is not required for the A3966.
Internal circuit protection includes thermal shutdown with hysteresis, ground-clamp and flyback diodes, and crossover-current protection.