A3982SLB

A3982SLB Datasheet

A3982 DMOS Stepper Motor Driver with Translator

Part	Datasheet
A3982SLB	A3982SLB (pdf)

Related Parts	Information
A3982SLB-T	A3982SLB-T
A3982SLBTR	A3982SLBTR

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A3982 DMOS Stepper Motor 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 SOICW with internally fused leads suffix LB The A3982 is a complete stepper motor driver with builtin translator for easy operation. It is designed to operate bipolar stepper motors in full- and half-step modes, with an output drive capacity of up to 35 V and ±2 A. The A3982 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 A3982. Simply inputting one pulse on the STEP input drives the motor one step. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A3982 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. The chopping control in the A3982 automatically selects the current decay mode Slow or Mixed . When a signal occurs at the STEP input pin, the A3982 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 Not to scale Continued on the next Pin-out Diagram OUT2A 1 SENSE2 2 VBB2 3 OUT2B 4 ENABLE 5 PGND 6 PGND 7 CP1 8 CP2 9 VCP 10 VREG 11 MS1 12 Charge Pump Translator & Control Logic 24 OUT1A 23 SENSE1 22 VBB1 21 OUT1B 20 DIR 19 PGND 18 PGND 17 REF 16 STEP 15 VDD 14 ROSC 13 RESET 26184.28C A3982 DMOS Stepper Motor Driver with Translator Description continued fixed off-time, then to a slow decay for the remainder of the off-time . This current decay 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 power-on sequencing is not required. The A3982 is supplied in a 24-pin wide-body SOIC package LB with internally-fused power ground leads for enhanced thermal dissipation. It is lead Pb free, with 100% matte tin plated leadframe. Selection Guide Part Number Packing* A3982SLB-T 31 pieces per tube A3982SLBTR-T 1000 pieces per reel *Contact Allegro for additional packing options Package 24-pin Wide SOIC with pins 6 and 7, and 18 and 19, fused internally Absolute Maximum Ratings Characteristic Load Supply Voltage Logic Input Voltage Sense Voltage Reference Voltage Output Current Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VBB VIN VSENSE VREF IOUT TA TJ max Tstg

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A3982 DMOS Stepper Motor 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 SOICW with internally fused leads suffix LB

The A3982 is a complete stepper motor driver with builtin translator for easy operation. It is designed to operate bipolar stepper motors in full- and half-step modes, with an output drive capacity of up to 35 V and ±2 A. The A3982 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 A3982. Simply inputting one pulse on the STEP input drives the motor one step. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A3982 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.

The chopping control in the A3982 automatically selects the current decay mode Slow or Mixed . When a signal occurs at the STEP input pin, the A3982 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

Not to scale

Continued on the next

Pin-out Diagram

OUT2A 1 SENSE2 2

VBB2 3 OUT2B 4 ENABLE 5 PGND 6 PGND 7

CP1 8 CP2 9 VCP 10 VREG 11 MS1 12

Charge

Pump

Translator & Control Logic
24 OUT1A 23 SENSE1 22 VBB1 21 OUT1B 20 DIR 19 PGND 18 PGND 17 REF 16 STEP 15 VDD 14 ROSC 13 RESET
26184.28C

A3982

DMOS Stepper Motor Driver with Translator

Description continued fixed off-time, then to a slow decay for the remainder of the off-time . This current decay 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 power-on sequencing is not required.

The A3982 is supplied in a 24-pin wide-body SOIC package LB with internally-fused power ground leads for enhanced thermal dissipation. It is lead Pb free, with 100% matte tin plated leadframe.

Selection Guide Part Number

Packing*

A3982SLB-T
31 pieces per tube

A3982SLBTR-T
1000 pieces per reel
*Contact Allegro for additional packing options

Package
24-pin Wide SOIC with pins 6 and 7, and 18 and 19, fused internally

Absolute Maximum Ratings

Characteristic Load Supply Voltage Logic Input Voltage Sense Voltage Reference Voltage

Output Current

Operating Ambient Temperature Maximum Junction Temperature Storage Temperature

Symbol VBB VIN

VSENSE VREF

IOUT

TA TJ max

Tstg

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Datasheet ID: A3982SLB 516034