Product 產品介紹
Product 產品介紹
Stepper Motor Driver A3979: Microstepping DMOS Driver with Translator
Stepper Motor Driver A3979: Microstepping DMOS Driver with Translator
The A3979 is a complete microstepping motor driver with built-in translator, designed as a pin-compatible replacement for the successful A3977, with enhanced microstepping (1/16 step) precision. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2.5 A. The A3979 includes a fixed off-time current regulator that has the ability to operate in Slow, Fast, or Mixed decay modes. This current-decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

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Features and Benefits:
  • ±2.5 A, 35 V output rating
  • Low RDS(On) outputs: 0.28 Ω source, 0.22 Ω sink, typical
  • Automatic current decay mode detection/selection
  • 3.0 to 5.5 V logic supply voltage range
  • Slow, Fast or Mixed current decay modes
  • Home output
  • Synchronous rectification for low power dissipation
  • Internal UVLO and thermal shutdown circuitry
  • Crossover-current protection
Function Block Diagram:

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