A3986SLDTR-T

A3986SLDTR-T Datasheet

A3986 Dual Full-Bridge MOSFET Driver

Part	Datasheet
A3986SLDTR-T	A3986SLDTR-T (pdf)

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A3986 Dual Full-Bridge MOSFET Driver with Microstepping Translator Not for New Design These parts are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change January 30, 2012 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A4989. NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. A3986 Dual Full-Bridge MOSFET Driver with Microstepping Translator 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 Package 38 pin TSSOP suffix LD The A3986 is a dual full-bridge gate driver with integrated microstepping translator suitable for driving a wide range of higher power industrial bipolar 2-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. Approximate size Continued on the next Typical Application Diagram A3986 Dual Full-Bridge MOSFET Driver with Microstepping Translator Description continued The above-supply voltage required for the high-side N-channel MOSFETs is provided by a bootstrap capacitor. Efficiency is enhanced by using synchronous rectification and the power FETs are protected from shoot-through by integrated crossover control and programmable dead time. In addition to crossover current control, internal circuit protection provides thermal shutdown with hysteresis and undervoltage lockout. Special power-up sequencing is not required. This component is supplied in an 38-pin TSSOP package LD . The package is lead Pb free, with 100% matte tin leadframe plating. Selection Guide Part Number A3986SLDTR-T Packing Tape and reel, 4000 pieces per reel Absolute Maximum Ratings Characteristic Supply Voltage Logic Supply Voltage Logic Inputs and Outputs SENSEx pins Sxx pins LSSx pins GHxx pins GLxx pins Cxx pins Operating Ambient Temperature Junction Temperature Storage Temperature Symbol VBB VDD TA TJ max Tstg Range S Notes Rating to 50 to 7 to 7 to 1 to 55 to 5 Sxx to Sxx+15 to 16 to Sxx+15 to 85 150 to 150 Units V ºC ºC ºC Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A.

PDF Datasheet Preview

A3986 Dual Full-Bridge MOSFET Driver
with Microstepping Translator

Not for New Design

These parts are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.

Date of status change January 30, 2012

Recommended Substitutions:

For existing customer transition, and for new customers or new applications, refer to the A4989.

NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.

A3986

Dual Full-Bridge MOSFET Driver with Microstepping Translator
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

Package 38 pin TSSOP suffix LD

The A3986 is a dual full-bridge gate driver with integrated microstepping translator suitable for driving a wide range of higher power industrial bipolar 2-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.

Approximate size

Continued on the next

Typical Application Diagram

A3986

Dual Full-Bridge MOSFET Driver with Microstepping Translator

Description continued The above-supply voltage required for the high-side N-channel MOSFETs is provided by a bootstrap capacitor. Efficiency is enhanced by using synchronous rectification and the power FETs are protected from shoot-through by integrated crossover control and programmable dead time.

In addition to crossover current control, internal circuit protection provides thermal shutdown with hysteresis and undervoltage lockout. Special power-up sequencing is not required.

This component is supplied in an 38-pin TSSOP package LD . The package is lead Pb free, with 100% matte tin leadframe plating.

Selection Guide Part Number

A3986SLDTR-T

Packing Tape and reel, 4000 pieces per reel

Absolute Maximum Ratings

Characteristic Supply Voltage Logic Supply Voltage Logic Inputs and Outputs SENSEx pins Sxx pins LSSx pins GHxx pins GLxx pins Cxx pins Operating Ambient Temperature Junction Temperature Storage Temperature

Symbol VBB VDD

TA TJ max

Tstg

Range S

Notes

Rating to 50 to 7 to 7
to 1 to 55 to 5 Sxx to Sxx+15 to 16 to Sxx+15 to 85
150 to 150

Units V ºC ºC ºC

Allegro MicroSystems, LLC
115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

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Datasheet ID: A3986SLDTR-T 516036