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A4989

Allegro
Part Number A4989
Manufacturer Allegro
Description Dual Full-Bridge MOSFET Driver
Published Feb 11, 2019
Detailed Description A4989 Dual Full-Bridge MOSFET Driver with Microstepping Translator FEATURES AND BENEFITS ▪ 2-wire step and direction in...
Datasheet PDF File A4989 PDF File

A4989
A4989

Overview
A4989 Dual Full-Bridge MOSFET Driver with Microstepping Translator FEATURES AND BENEFITS ▪ 2-wire step and direction interface ▪ Dual full-bridge gate drive for N-channel MOSFETs ▪ Operation over 12 to 50 V supply voltage range ▪ Synchronous rectification ▪ Cross-conduction protection ▪ Adjustable mixed decay ▪ Integrated sinusoidal DAC current reference ▪ Fixed off-time PWM current control ▪ Enhanced low current control when microstepping ▪ Pin compatible with the A3986 PACKAGE: 38 pin TSSOP (suffix LD) Approximate footprint DESCRIPTION The A4989 is a dual full-bridge gate driver with integrated microstepping translator suitable for driving a wide range of higher power industrial bipolar two-phase stepper motors (typically 30 to 500 W).
Motor power is provided by external N-channel power MOSFETs at supply voltages from 12 to 50 V.
This device contains two sinusoidal DACs that generate the reference voltage for two separate fixed off-time PWM current controllers.
These provide current regulation for external power MOSFET full bridges.
Motor stepping is controlled by a two-wire step and direction interface, providing complete microstepping control at full-, half-, quarter-, and sixteenth-step resolutions.
The fixed-off time regulator has the ability to operate in slow-, mixed-, or fast-decay modes, which results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.
The translator is the key to the easy implementation of this IC.
Simply inputting one pulse on the STEP input drives the motor one step (full, half, quarter, or sixteenth depending on the microstep select input).
There are no phase-sequence tables, high frequency control lines, or complex interfaces to program.
This reduces the need for a complex microcontroller.
Continued on the next page… Typical Application Diagram 4989-DS, Rev.
4 MCO-0000828 April 3, 2023 A4989 Dual Full-Bridge MOSFET Driver with Microstepping Translator DESCRIPTION (continued) The above-supply...


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