The A3973SB and A3973SLB are dual DMOS full-bridge micro-stepping PWM motor drivers designed for bipolar microstepping stepper motor pulse-width modulated (PWM) current control.
The A3973SB and A3973SLB are dual DMOS full-bridge microstepping PWM motor drivers designed for pulse-width modulated current control of bipolar stepper motors. These devices support continuous output currents up to +1 A and operating voltages up to 35 V. They are available in 24-lead plastic DIP (A3973SB) and SOIC (A3973SLB) packages with copper batwing power tabs.
| Continuous Output Current | +1 A |
|---|---|
| Operating Voltage | 35 V |
| Load Supply Voltage | 15 V to 35 V |
| Internal Oscillator Frequency | 4 MHz |
| Operating Temperature Range | -20°C to +85°C |
The A3973SB is supplied in a 24-lead plastic DIP package, while the A3973SLB is supplied in a 24-lead plastic SOIC package.
No, synchronous rectification circuitry eliminates the need for external clamp diodes in most applications.
The device can operate in slow, fast, and mixed current-decay modes.