A3983SLPTR

A3983SLPTR Datasheet

A3983 DMOS Microstepping Driver with Translator

Part	Datasheet
A3983SLPTR	A3983SLPTR (pdf)

Related Parts	Information
A3983SLP-T	A3983SLP-T
A3983SLP	A3983SLP

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A3983 DMOS Microstepping Driver with Translator Low RDS ON outputs Automatic current decay mode detection/selection Mixed and Slow current decay modes Synchronous rectification for low power dissipation Internal UVLO and thermal shutdown circuitry Crossover-current protection Package 24-pin TSSOP with exposed thermal pad suffix LP Not to scale The A3983 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A3983 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes. The translator is the key to the easy implementation of the A3983. 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 A3983 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. The chopping control in the A3983 automatically selects the current decay mode Slow or Mixed . When a signal occurs at the STEP input pin, the A3983 determines if that step results in a higher or lower current in each of the motor phases. If the change is to a higher current, then the decay mode is set to Slow decay. If the change is to a lower current, then the current decay is set to Mixed set initially to a fast decay for a period amounting to of the fixed off-time, then to a slow decay for the remainder of the off-time . This current decay Continued on the next Functional Block Diagram VREG ROSC Current Regulator Charge Pump STEP DIR RESET MS1 MS2 Translator ENABLE SLEEP PWM Latch Blanking Mixed Decay Control Logic PWM Latch Blanking Mixed Decay DMOS Full Bridge Gate Drive DMOS Full Bridge VBB1 OUT1A OUT1B SENSE1 VBB2 OUT2A OUT2B SENSE2 VREF uF RS1 RS2 26184.29D A3983 DMOS Microstepping Driver with Translator Description continued control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage lockout UVLO , and crossover-current protection. Special poweron sequencing is not required. The A3983 is supplied in a low-profile mm maximum height , 24-pin TSSOP with exposed thermal pad suffix LP . It is lead Pb free, with 100% matte tin leadframe plating. Selection Guide Package A3983SLPTR-T 24-pin TSSOP with exposed thermal pad Packing 4000 pieces per 13-in. reel

PDF Datasheet Preview

A3983 DMOS Microstepping Driver with Translator

Low RDS ON outputs Automatic current decay mode detection/selection Mixed and Slow current decay modes Synchronous rectification for low power dissipation Internal UVLO and thermal shutdown circuitry Crossover-current protection

Package 24-pin TSSOP with exposed thermal pad suffix LP

Not to scale

The A3983 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A3983 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes.

The translator is the key to the easy implementation of the A3983. 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 A3983 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.

The chopping control in the A3983 automatically selects the current decay mode Slow or Mixed . When a signal occurs at the STEP input pin, the A3983 determines if that step results in a higher or lower current in each of the motor phases. If the change is to a higher current, then the decay mode is set to Slow decay. If the change is to a lower current, then the current decay is set to Mixed set initially to a fast decay for a period amounting to of the fixed off-time, then to a slow decay for the remainder of the off-time . This current decay

Continued on the next

Functional Block Diagram

VREG

ROSC

Current Regulator

Charge Pump

STEP DIR

RESET MS1 MS2

Translator

ENABLE SLEEP

PWM Latch Blanking

Mixed Decay

Control Logic

PWM Latch Blanking

Mixed Decay

DMOS Full Bridge

Gate Drive

DMOS Full Bridge

VBB1 OUT1A OUT1B SENSE1 VBB2 OUT2A OUT2B SENSE2

VREF
uF RS1 RS2
26184.29D

A3983

DMOS Microstepping Driver with Translator

Description continued
control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage
lockout UVLO , and crossover-current protection. Special poweron sequencing is not required.

The A3983 is supplied in a low-profile mm maximum height , 24-pin TSSOP with exposed thermal pad suffix LP . It is lead Pb free, with 100% matte tin leadframe plating.

Selection Guide

Package

A3983SLPTR-T
24-pin TSSOP with exposed thermal pad

Packing 4000 pieces per 13-in. reel

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived A3983SLPTR Datasheet file may be downloaded here without warranties.

Datasheet ID: A3983SLPTR 516035