TI Spins MotorsSmarter ∙ Safer ∙ Greener

李志林

美国德州仪器中国市场经理

马达驱动

Agenda

• Basic knowledge for Motor

•TI Motor Driver Advance Features

•TI Motor Driver Product Roadmap

2

TI can help you with your Motor needs!

• TI has been doing motors for over 20 years.– Primarily custom designs for large customers

(Disk drive servo motors / Inkjet & Laser printer motors / Automotive)

– C2000 is one of the highest performance motor platforms!

• TI has the analog, digital & system expertise

• TI has the semiconductor process expertise

• Kilby R&D Motor Lab - Get your motor running!

• TI’s Motor Driver Business Unit is here to help.

4

Overview different motor typesVoltage Motor Type Applications Strengths Weaknesses EVMs

Stepper printers, scanners,

positioning,

automation

constant torque, high

holding torque, precise

position control

control complexity can vary; speed

control or high load condition

DRV8818EVM

DRV8711EVM

Brushed DC (BDC) power tools,

battery operated (toys,

tooth brush, ..)

cheap to manufacture,

simple control, no feedback

necessary

low reliability (due to brushes),

EMI, arcing, noisy, more difficult to

cool, maintenance costs are

relatively high

DRV8840EVM

Switched Reluctance

(SR) (Synchronous)

traction,

appliances/white goods

low cost, highly reliable complex control necessary to

eliminate noise and torque ripple

Universal power tools, fans, small

appliances (coffee

grinders, blenders,

sewing machines, ..)

cheap, simple control, good

power/weight ratio, speed

control possible, no

feedback necessary, can be

powered with AC or DC

low reliability (due to brushes),

EMI, arcing, noisy,

poor torque and limited control,

only unidirectional

Brushless DC

(BLDC)

(Synchronous)

automation, traction,

precision,

appliances/white goods

efficient, reliable, smooth

operation; can be used in

combustible environments;

high torque

complex control for highest

efficiency; relatively expensive,

introduces electrical noise and

torque ripple, normally needs

sensors

DRV8301EVM

DRV8312-C2-

KIT

Permanent Magnet

Synchronous

(PMSM) or

automation, traction,

precision,

appliances/white goods

efficient, reliable, smooth

operation; can be used in

combustible environments;

high torque, quieter than

BLDC

very complex control and

(normally) sensors needed for

highest efficiency; relatively

expensive

DRV8301EVM

AC Induction

(Asynchronous)

appliances/white goods,

pumps, fans

motor is cheap, quiet, long

lasting, efficient at fixed

speeds

poor at low speeds, sensors and

complex control necessary for high

efficiency -> price rises

C2000

Stepper

BDC

BLDC

PMSM

ACIM

DRV8x: Integrated Driver

Motor Control Diagram

TIDave’sControlCenter

System

Controller

Motor

Controller

Gate

DriverFETs

Function Solution Contact

Motor Controller C2000, ARM, or MSP430 Chris Clearman

Integrated Drivers /

Gate Drivers

DRV8x Product Family

LM5100A/B/C, LM5101A/B/C, UCC37xxx, UCC27xxx

Gate Drivers

Mike Firth

FETs NexFETs (40/60V FETS sampling 4Q) Chris Bull

Control Loop Current Sense Amps and ADCs Mike Firth

Power Buck, Boost, Simple Switcher Power Modules, etc Power PMEs

Isolation Bus/PWM Isolators, RS-485, Can Transceivers Neel Seshan

Control Loop (Torque, speed, or position)

Power

Isolation

DRV9 MCU+Pre-driver

DRV10/11: Single solution

DRV8x V.S. Discretes/DRV8x系列 V.S. 分立元件

Discrete H-Bridge Motor Driver

分离H桥电机驱动

Short Circuit Protection Fuse

短路保险丝

+11V Supply

Smaller /更小

Better Performance/性能更好

Thermal & Short Circuit

Protection/过热&短路保护

Shoot-Through Protection/直通保护

UVLO&ESD Protection/欠压闭锁及 ESD保护

DRV8x: Drop in and Spin!

DRV8x：即插即转！

8

DC Motor Model - Startup

VS

RM

LM

BEMF

VS

RM * IM = 0

IM = 0

BEMF = 0VS

RM

LM

BEMF

RM * IM > 0

IM > 0

BEMF = 0

VS = L di/dt VS = RMIM + L di/dt

VS

RM

LM

BEMF

RM * IM > 0

IM > 0

BEMF > 0

VS = RMIM + L di/dt + VEMF

t0 t0 + >> t0

VM

Normal Operation(PWM Voltage On)

Asynchronous vs. Synchronous Decay

Asynchronous Decay(PWM Voltage Off)

VM

Asynchronous Decay:• Recirculation current “Free Wheels” through the body diodes. Power loss = I x 2VD

Synchronous Decay:

• Recirculation current flows through the FETs

•.Power loss = I2 x (2xRDSON) and is typically lower than Asynchronous decay.

• There are several types of synchronous decay modes: Fast, Slow, and Mixed

Synchronous Decay(PWM Voltage Off)

VM

Decay Mode Performance Tradeoffs

Slow Decay

VM

Fast Decay

VM

Mode Current

Decay

Torque Ripple/

Audible Noise

Voltage

to the load

Control when winding

current is decreasing

Slow Decay Slow Good Higher OK

Fast Decay Fast Poor Lower Better

Mixed Decay Mode: The best of Both?

Stepper Winding CurrentCurrent Mode Profiles

Critical Points:

Mixed decay: % of the decay cycle is fast decay followed by slow decay

Fast and slow decay ratio may be programmable depending on the driver

Mixed decay is ideally suited for micro-stepping

Different Decay Modes Current Waveform Example不同衰减模式下的电流波形示例

Fast decay

快速衰减Slow decay

缓慢衰减

Mixed decay

混合衰减

快速衰减 缓慢衰减

Higher current with lower ripple

平均电流更大，纹波更小Lower current with higher ripple

平均电流更小，纹波更大

Somewhere in between

中间的平衡点

Current Regulation电流调节

VM

+ -

VBULK

+ -

AmpRSA IMAX

VREFAB

High Side Sense Resistor Low Side Sense Resistor

AmpIMAX

VREF

REF

CHOPSENSE

VI

GAIN R

• When a winding is activated by PWM chopping, the current

through it rises until it reaches chopping current threshold

“Ichop”.

线圈在PWM信号的作用下会产生电流，这一电流会持续增长直

到达到电流阈值。

• Then all the FETs are OFF for a discretely adjustable fixed

time.

这之后所有功率管都会在一个固定时间内持续关断（这一固定

时间应可通过分立元件调节）。

• A blanking period should be employed immediately after

turning on the FETs to ignore current sense operation, in

order to avoid false-tripping on transients.

在打开功率管后应马上利用一段消隐时间来忽略电流检测电路

的作用，从而避免由于瞬时电流而导致的功率管关断误判。ITRIP

TBLANK TBLANK TBLANK

False Itripavoided/避免Itrip

误判

Configuring Itrip

SENSE

REFTRIP

RGAIN

VI

Amp

VREF

Winding Current

In Volts (V)

Reference Voltage

IMAX

To H Bridge Enable

RSENSE

M

Low Side Current Sensing

DRV8818 µStepping Current Waveform ExampleDRV8818微步进电流波形示例

Full stepping

全步步进

1/4 µ-stepping

1/4微步进

1/2 µ-stepping

1/2微步进

1/8 µ-stepping

1/8微步进

Advance Features & Hero Product

Lower Rdson

Small Package

Full Protection

Total Solution: SW&HW

• Short Circuit, Over Current, Thermal, UVLO…

• 短路/过流/过热保护、欠压锁定…

• Up to 20x smaller than discrete solutions!

• 较分立元件方案节省20倍的面积！

• EVM requires NO discrete design experience

→ quicker time to market!

• EVM无需分立器件设计→以更短的研发周期把您的产品推向市场！

• Ultra efficient architectures help you minimize

MCU support！• 超高效的系统架构帮您把花在MCU上的精力最小化！

Charge

Pump

20

transistors

VMVCP

-

Power-up

Reset

10 trans.

Clock

Oscillator

15 trans.

Linear

Reg

15

transistors

VGDVMLinear

Reg

15

transistors

VDD

+3.3V

HS pre-drive

30 trans

VCP

I

Limit

+

-

Digital

Logic

5,000

gates

Temperature

sense

10 trans.

LS pre-drive

30 trans.

VCP

VMVM

VM

HS pre-drive

30 trans.

LS pre-drive

30 trans.

Amp

OUT1

OUT2

VREF

VPROPI

VDD

FAULT

OCP

OCP

Comp

Op-

amp

Reduced Board Space/节省电路板空间

Fully Protected/全面保护

Embedded Intelligence/内嵌智能模块

Drop in and Spin/即插即转

DRV8x Family Feature Intro

DRV8x 系列产品特性简介

How to Select Your

DRV8x:By Motor Type:

• Stepper, Brushed DC, BLDC,

Solenoid/Relay

By Power Source/Current

Capability:

• Line-powered, Battery-powered

By Feature:

• Motion profile, Current

regulation, Sleep mode, Thermal

performance, Form factor…

如何选择适合您使用的DRV8x:按电机类型:

• 步进电机，直流有刷电机，直

流无刷电机，螺线管/继电器

按供电类型/带负载能力:

• 电源供电，电池供电

按特性:

• 运动曲线特性，电流调节，休

眠模式，热工性能，尺寸大小…

DRV8818 Functional Block DiagramDRV8818 原理框图

1.75A continuous

2.5A peak

µ-stepping (full, 1/2, 1/4, 1/8)

微步进设置(full, 1/2, 1/4, 1/8)

Step/Direction control

步进/转向控制

Current sense

电流检测

PWM blanking and

off time setting

PWM消隐/关断时间设置

Decay mode setting

电流衰减模式设定

3~5.5V

8~35V

•NCH power MOSFETs

N沟道功率MOS管

•Pre-driver/预驱

•PWM/脉宽调制

•Current Regulation/电流调节

Built-in charge pump

内置电荷泵

Greater than 30% temperature reduction

Pin to pin compatible drops into existing layout

DRV8818 - The Coolest 2.5A Microstepping Motor Driver

TI - DRV8818 Rohm Allegro

Max Temp 157°CMax Temp 130°CMax Temp 107°C

2.5A sine wave peak, 1/8 micro-stepping, 2-layer board

Roadmap

DRV8818 vs. Allegro’s A3979, Rohm’s BD63860

Competitive ComparisonSpecification DRV8818 BD63860 A3977 A3979 LV8731V

Rdson, typical 0.37 Ω HS+LS 0.80 Ω HS+LS 0.81 Ω HS+LS 0.50 Ω HS+LS 0.55Ω (at 2A)

Operating

Voltage(s)

Vm - 8 to 35V Vm - 16 to 28V Vm - 8 to 35V Vm - 8 to 35V 32V

Vcc - 3 to 5.5V Vcc - 3 to 5.5V Vcc - 3 to 5.5V Vcc - 3 to 5.5V 9～32V

Thermal

ComparisonRuns Cooler! Runs hotter Runs hotter Runs hotter Runs hotter

Sleep Current3.5uA, typical 400uA, typical typical not stated typical not stated typical not stated

40uA max 2mA max 20uA max 20uA max 50uA max

Micro-steppingfull-, half-, quarter-,

and eighth-step

full-, half-, quarter-,

and eighth-step

full-, half-, quarter-,

and eighth-step

full-, half-, quarter-,

and sixteenth-step

full-, half-, quarter-,

and eighth-,

sixteen step

ProtectionOCP, OTS, UVLO,

cross-conduction

OTS, No OCP,

cross-conduction

OTS, No OCP,

cross-conduction

OTS, No OCP,

cross-conduction

OTS, No OCP,

Short Circle

Protector (Latch)

Package(s) 28-HTSSOP (P2P) 28-HTSSOP (P2P) 28-HTSSOP (P2P) 28-HTSSOP (P2P)SSOP44K

15.0×7.6×1.7mm

Cost $2.40 @ 1ku $3.75 @ 1ku $2.95 @ 1ku $4.00 @ 1ku 25RMB

Replacement

Code

Q: SAME FUNCTIONALITY AND PINOUT but NOT an exact

equivalent.

Two interface can

selection

1A / 9V : Average case temp = 52°C

DISCRETE vs DRV8837

PCHAN FET PCHAN FET

NCHAN FETNCHAN FET

TI DRV8837

2mm X 2mm WSON

package

Advantages of integrated TI part

• Board space savings our solution 10x smaller than discrete.• Area of Discrete solution = 225mm2

• Area of TI Integrated solution = 12mm2 + 8mm2 (2 caps) = 20mm2

• PCB cost savings with TI solution ($0.45 – $0.04) = $0.40

• Assembly cost savings with TI solution (18 points – 3 points) = 15 points = $0.02

• Good protection integrated – REMOVE RESETTABLE FUSE (~10cents / piece)• Over Current

• Thermal Shutdown

• Under voltage Lockout

• Better reliability – Fewer components on board

DRV8837

FuseDiscrete solution

OCP Implementation – Analog (DRV88xx)

Ovecurrent Detect

Analog Ilimit

OVERCURRENT

(to digital)

OUTPUT

FET

AMP

+

-

AMP

+

-

PRE_DRIVE

COMP

+

- VREF

OUT

VM

HS_ON

(from digital)

Analog OCP implementation (high side shown)

Coupled

Stepper Winding CurrentCurrent Mode Profiles

Two analog components of OCP:

- An analog current limit removes gate drive to the power FET to prevent very high

currents from damaging the device (ILIMIT)

- An overcurrent detection circuit monitors the current and provides an overcurrent

signal to the digital core if the current exceeds IOCP

Critical Points:

Dead Short on DRV88xx

Short circuit occurs

Analog current limit reduces current to ~ 9A

in about ~ 400ns

After a deglitch of ~ 3uS, outputs are tri-

stated

Enable pin

Winding current

Fault Pin

DRV8312 + LMP8645HV

High performance, fully protected 3-phase brushless

motor drive stage

3-Phase Brushless Drive Stage:

• 6.5A Brushless Motor Driver

• Up to 97% efficient

• Fully protected: Short Circuit, Thermal, ULVO,

Inrush current protection

• In-line Current Sense Amplifiers

• CM Input Range: -2V to 76V

• Gain: 1 to 100V/V (adjustable)

• CMRR: 95 dB

High performance, fully protected 3-phase motor

drive stage and accurate reading of the phase

currents enables the motor controller to deliver

maximum motor performance.

iCombo

Shaft

Encoder

SIN

COSADS7223

DRV8312Motor Driver

TIDave’sControlCenter

-+

-+

LMP8645HV

Tools/Resources

• DK-LM32-DRV8312

• DRV8312-C2-Kit

• LMP8645MKEVAL

Motor

Controller

C2000,

Stellaris,

MSP430

DRV8x Motor Kits

DRV8301-HC-C2-KIT

DRV8312-C2-KIT

DRV8412-C2-KIT

DRV8825EVM

DRV8833EVM

BLDC

MSP430™

Stellaris®

C2000™

FOC

DK-LM3S-DRV8312

• Software Support:

• Field Oriented Control (sensorless)

• InstaSPIN support

• Speed & torque control loops

• Supports up to 60V / > 60A applications

• Piccolo + DRV8301 (1.7A Pre-driver with

2x current sense amps and 1.5A buck)

+ 120A FETs.

Quicker Time to Spin! DRV8301-HC-C2-KIT 3-Phase Brushless Motor Drive and Control

Features:

Pricing: $299

In Stock / In Production

Order Now!

Control Suite

InstaSpin Closed Loop with GUI

Product Roadmap

New

Stepper Motor DriversN

N

S S

1.6A (8.2 to 45V)

1/32 uStep

1.9A (8 to 38V)

1/8 uStep

1.5A (8 to 32V)

1/8 uStep

Drives 2x Steppers

On Chip Indexers: Up to 32-uSteps

2.5A (8.2 to 45V)

1/32 uStep

3A (8.2 to 45V)

Phase/Enable Ctrl

½ Stepper

1.6A (8.2 to 45V)

Phase/Enable Ctrl2.5A (8.2 to 45V)

Phase/Enable Ctrl

5.0A (8.2 to 45V)

Phase/Enable Ctrl

½ Stepper

Mid Current Steppers: > 32-uSteps

2.5A (8.2 to 45)

PWM Ctrl

5A (8.2 to 45)

PWM Ctrl

½ Stepper

Selection Matrix

Sampling

1.5A (8 to 32V)

SPI Ctrl

Drives 2x Steppers

6A (0 to 52V)

500kHz / 5ns Dead-time

PWM Ctrl

12A (0 to 52V)

500kHz / 5ns Dead-time

PWM Ctrl

DRV8821 DRV8811

DRV8823

DRV8828DRV8812

DRV8432DRV8412

Production In Design

P2P

P2P P2PDRV8813 DRV8842

DRV8841/43

DRV8829

DRV8825DRV8824

2.5A (8 to 35V)

1/8 uStep

P2P

High Current Steppers: > 32-uSteps

2.5A (8.2-60V)

Split Rail Support

DRV8844

DRV8818

Brushed DC Motor Drivers

2.2A (8 to 36V)

8801: Current sense pin

Phase/Enable Ctrl

1.6A (8.2 to 45V)

Inrush Protection

Phase/Enable Ctrl

Single Brushed

2.5A (8.2 to 45V)

Inrush Protection

Phase/Enable Ctrl

5.0A (8.2 to 45V)

Inrush Protection

Phase/Enable Ctrl

2.5A (8.2 to 45V)

Inrush Protection

PWM Ctrl

Dual Brushed

5A (8.2 to 45V)

Inrush Protection

PWM Ctrl

1.5A (8 to 32V)

Inrush Protection

SPI I/F

6A (0 to 52V)

Inrush Protection

PWM Ctrl

12A (0 to 52V)

Inrush Protection

PWM Ctrl

Selection Matrix

DRV8823

DRV8432DRV8412

DRV8800/1

SamplingProduction In Design

P2PDRV8814 DRV8841/43

DRV8842DRV8840

DRV8802

12A (0 to 52V)

Inrush Protection

PWM Ctrl

24A (0 to 52V)

Inrush Protection

PWM Ctrl

DRV8432DRV8412

Quad Brushed

2.5A (8.2-60V)

Split Rail Support

DRV8844

New

3Q12

3-Phase Brushless Motor Drivers

1.7A Gate Drive (8 to 60V)

2x current sense amps

Integrated Buck

DRV8301 (SPI) / 8302 (HW)

Pre-Drivers

Integrated Driver

6.5A (0 to 52V)

Up to 97% Efficient

500kHz / 5ns Dead-time

13A (0 to 52V)

Up to 97% Efficient

500kHz / 5ns Dead-time

Selection Matrix

DRV8312 DRV8332

SamplingProduction In Design

3A (12 to 32V)

Integrated speed loop

3x Hall Amps & +5V supply

Sine / Trap Control

Controller + FETS

DRV8301/02

DRV8817

4.8A (8 to 32V)

Integrated speed loop

3x Hall Amps & +5V supply

Sine / Trap Control

2.5A (8.2 to 60V)

Integrated comparator

DRV8313

DRV8815

10 to 30V

Integrated speed loop

3x Hall Amps & +5V supply

Sine / Trap Control

DRV8712

New

New

NewNew

New

Bru

sh

ed

DC

Ste

pp

er

DRV8834

DRV8835

DRV8x Low Voltage

DRV8837 DRV8851

Mo

tor

Typ

e

DRV8836

DRV8833 2A (2.7 to 10.8V)

Full or half step

PWM Ctrl

2.2A (2.5 to 10.8V)

1/32-step indexer

> 1/32-step with MCU support

Step/Dir & Phase Enable Ctrl

1.5A (2.0 to 11V)

Dual Supplies

Full or half step

Phase Enable

or PWM Ctrl

DRV8835

DRV8836

DRV8833DRV8830

DRV8832

Single: 4A (2.7 to 10.8V)

Dual: 2 x 2A

PWM Ctrl

Single: 3A (2.0 to 11V)

Dual: 2 x 1.5A

Dual Supplies

Phase Enable

or PWM Ctrl

1.8A (2.0 to 11V)

Dual Supplies

PWM Ctrl

1A (2.75 to 6.8V)

Voltage Regulation

IN1/IN2 or I2C I/F

Single: 3A (2.0 to 7V)

Dual: 2 x 1.5A

Phase Enable

or PWM Ctrl

1.8A (2.0 to 11V)

Dual Supplies

150mA LDO

PWM Ctrl

1.5A (2.0 to 7V)

Full or half step

Phase Enable

or PWM Ctrl

(Products Highlighted in RED are Sampling, and Blue are Roadmap Products)

Battery Powered

Applications

Selection Matrix

New

Solenoid / Relay Drivers(High Side or Low Side Switching)

SamplingProduction In Design

1A (8.2 to 60V)

PWM Ctrl

Low Side Only

4x 1A (8.2 to 60V)

Serial Ctrl

Low Side Only

Selection Matrix

1.75A (8.2 to 45V)

PWM Ctrl

1.5A (2.75 to 10.8V)

PWM Ctrl

3.5A (8.2 to 45V)

PWM Ctrl

1A (2.75 to 6.8V)

IN1/IN2 Ctrl

6A (0 to 52V) 14A (0 to 52V)

DRV8832

DRV8432DRV8412

DRV8841/43

DRV8842

Quad Drivers

Dual Drivers

DRV8833

3A (2.75 to 10.8V)

PWM Ctrl

DRV8833

3A (0 to 52V)

PWM Ctrl

7A (0 to 52V)

PWM Ctrl

DRV8432DRV8412

In Definition

DRV8803 DRV8804

4 x 1A (8 to 40V)

Open/Shorted load detect

Serial Ctrl

Low Side Only

DRV8806

1K Pricing: $2.50

In Stock / In Production

Order Samples Now!

Features:

• 3-phase gate driver

• Supply voltage: 8 to 60V

• Gate Drive: 1.7A source / 2.3A sink

• Drive < 10A to 60A External FETs

• Dual Bi-directional current shunt amplifiers

• Adjustable gain (10x,20x,40x,80x) & offset

• Integrated buck converter

• Up to 1.5A (3.5V to 60V)

• 2-stage thermal, CBC over current, UVLO, &

shoot through protection with fault feedback

• SPI Management Interface14 x 8.1mm, 56-pin

HTSSOP package

DRV83013-Phase Brushless Gate Driver with Dual Shunt Amplifiers & 1.5A Buck FEATURED

PRODUCTS

8 to 60V

40W

PWM

SPI

FETs

Co

ntr

olle

r

/

DRV8301

Pre-Driver

1.5A Buck

Sense Amps

M

Sense Resistors

Brushed

DC Also

DRV8302: Block Diagram

Charge

Pump

Regulator

CP2

CP1

PVDD1

Phase A

(repeated for B & C)

High Side

Gate Drive

Low Side

Gate Drive

Timing

and

Control

Logic

SL_A

GH_A

GL_A

SH_AINH_A

INL_A

OSC

OCTW

EN_GATE

M_PWM

DTC

Buck

Converter

VSENSE

PH

Motor

SN1

SP1

SN2

SP2

SO1 SO2

Current

Sense

Amplifier1

Current

Sense

Amplifier2

M_OC

FAULT

GAIN

BIAS

AGND

EN_BUCK

OC_ADJ

REF

Offset

½ Vref

Offset

½ Vref

Rshunt1

PVDD2

Trickle

Charge

PVDD1

GVDD

BST_A

BST_BK

DC_CAL

PWRGD

SS_TR

RT_CLK

COMP DVDD

AVDD

Gate Driver

Control &

Fault

Handling

PGND

SN

SP

SO

_

+

DC_CAL

DC_CAL

DC_CAL

S1

S2

S1

5K

5K

200K

50K

200K

50K

100

_

+

REF

Vref/2

AVDD

AVDD

50K

50K

S2

Current Sense Amps

Roadmap

• Wide supply range supports industry standard supplies;

tune gate driver performance to applications needs.

• Flexible ctrl options and access to detailed fault reporting

• On-chip indexer supports smooth and quiet motion

profiles without support from the system controller.

• High performance current regulation minimizes output

ripple and distortion, delivering smoother motion profiles

• System controller is notified and can take corrective action

when a stall event occurs.

• Advanced on-chip protection reduces design

complexity and enables higher system reliability

Applications

Features Benefits

DRV8711: Stepper pre-driver with on-chip 1/256 micro-stepping indexer and stall detect

2.5 to 10.8V

Step/Dir, PWM or

SPI Ctrl

FAULTDRV8711

8 to +52V

SPI

Stall Detect

38-pin HTSSOP

(9.7 x 6.4mm)

Roadmap

Samples: Nov

Production: Jan 13

• Bipolar stepper gate driver:

• Supply voltage: 8 to 52V

• Gate drive: Up to 200mA source / 400mA sink

• Adjustable slew rate / dead-time / on-time

• Step/Dir, PWM, or SPI control options; SPI mgmt. I/F

• On-chip indexer supports up to 256 micro-steps

• Advanced highly configurable current regulation

• Programmable fixed time off & blanking times

• Slow, fast, programmable mixed decay, auto

mixed decay modes; scalable output current

• Stall detect with optional Back EMF output

• Integrated protection features including over-current,

thermal, shoot-through, UVLO, & gate drive over-current

• Textile mfg equipment, factory automation

• Security cameras, ATM, robotics, stage lighting

M

Fault

Stall

/

/

BEMF

Controller

1/256 u-step

(External)

FETs

SPI mgt. I/F

External FETS

+8 to 52V

Optional BEMF voltage for

external processing

Roadmap

DRV8711: Stepper Pre-Driver

Step/Dir, PWM or

SPI control options

Stall / Fault signals

• Up to 256 u-steps (Indexer)

• Advanced Current Regulation

• Highly Configurable / Fully Protected 10mA rail for MCU or

other system needs

Roadmap

DRV8711: Highly Configurable

Feature Range

Current Regulation

Fixed Time Off 500nS to 128uS (steps of 500nS)

Blanking Time 500nS to 5.12uS (steps of 20nS)

Adaptive Blank Time On / Off (< 30% FS current = ½ blank time)

Scalable Current (Torque register) 0 to 100% FS current (steps of 0.4%)

Decay Modes Slow, fast, mixed, & auto mixed

Mixed Decay Ratio % fast decay (steps of 500nS)

Sense Amp Gain 5x, 10x, 20x, or 40x

Gate Drive

Dead Time 50nS, 100nS, 200nS, or 400nS

Gate Drive/Slew Rate 50mA, 100mA, 150mA, 200mA (Source)

Gate Drive Time On 250nS, 500nS, 1uS, & 2uS

Stall Detect

BEMF Output Signal On / Off & scale down by 4x, 8x, 16x, or 32x

Stall Detect Threshold 1, 2, 4, or 8 missed steps

OCP

OCP Level 250mV, 500mV, 750mV, & 1V

Deglitch Time 1uS, 2uS, 4uS, & 8uS

Any Question?

Thanks