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A5985

Allegro
Part Number A5985
Manufacturer Allegro
Description DMOS Microstepping Driver
Published Aug 11, 2016
Detailed Description A5985 DMOS Microstepping Driver with Translator and Overcurrent Protection FEATURES AND BENEFITS • Drop-in replacement ...
Datasheet PDF File A5985 PDF File

A5985
A5985


Overview
A5985 DMOS Microstepping Driver with Translator and Overcurrent Protection FEATURES AND BENEFITS • Drop-in replacement for A4988 • Proprietary Adaptive Percent Fast Decay option • Low RDS(on) outputs • Single supply • Microstepping up to 32 microsteps per full step • Full torque step modes • Short-to-ground protection • Shorted load protection • Short-to-battery protection • Fault output • Low current Sleep mode, < 10 µA • Thin profile QFN • Thermal shutdown circuitry • Synchronous rectification for low power dissipation • Internal UVLO • Crossover-current protection APPLICATIONS • Video Security Cameras • Printers • Scanners • Robotics • ATM • POS PACKAGE: Not to scale 28-contact QFN with exposed thermal pad 5 mm × 5 mm × 0.
90 mm (ET package) DESCRIPTION The A5985 is a complete microstepping motor driver with built-in translator for easy operation.
It is designed to operate bipolar stepper motors from full-step up to 1/32 step modes.
Step modes are selectable by MSx logic inputs.
It has an output drive capacity of up to 40 V and ±2 A.
The A5985 introduces a proprietary Adaptive Percent Fast Decay (APFD) algorithm to optimize the current waveform over a wide range of stepper speeds and stepper motor characteristics.
APFD adjusts on-the-fly the amount of fast decay during a PWM cycle to keep current ripple at a low level over the various operating conditions.
This adaptive feature improves performance of the system resulting in reduced audible motor noise, reduced vibration, and increased step accuracy.
The translator is the key to the easy implementation of the A5985.
Simply inputting one pulse on the STEP input drives the motor one microstep.
There are no phase sequence tables, high frequency control lines, or complex interfaces to program.
The A5985 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.
Internal synchronous rectification control circuitry is provided to improve power dissipation during PW...


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