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17N40 Datasheet Fqp17n40

Manufacturer: Fairchild (now onsemi)

Overview: A3977 Microstepping DMOS Driver with Translator.

General Description

The A3977 is a plete microstepping motor driver, with builtin translator.

It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with output drive capability of 35 V and ±2.5 A.

The A3977 includes a fixed off-time current regulator that has the ability to operate in slow-, fast-, or mixed-decay modes.

Key Features

  • ±2.5 A, 35 V output rating.
  • Low rDS(on) outputs, 0.45 Ω source, 0.36 Ω sink typical.
  • Automatic current decay mode detection/selection.
  • 3.0 to 5.5 V logic supply voltage range.
  • Mixed, fast, and slow current decay modes.
  • Home output.
  • Synchronous rectification for low power dissipation.
  • Internal UVLO and thermal shutdown circuitry.
  • Crossover-current protection.

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