STEPPER MOTOR DRIVER SOLUTIONS

Jon ChenApplications Engineer

Introduction

Purpose» To introduce ROHM’s line of stepper motor drivers

Objectives» To provide an overview of the product offering» To discuss the focus of product development efforts» To highlight the features/functionality of ROHM’s stepper motor drivers

and their advantages» To introduce examples of common applications» To discuss available design resources

Common ApplicationsPrinter / Copier (Paper Feed) Scanner

Factory Automation Robotics

Miscellaneous

• Security Cameras• Sewing Machines

Year

BD6381EFV (1.2A)

2013

BD6425EFV (1.5A)

BD6423EFV (1.0A)

BD6380EFV (0.8A)

BD6290EFV (0.8A)

BD63860EFV (2.5A)

Standard Series (36V PARALLEL-IN)

Low Voltage Series (PARALLEL-IN)

Standard Series (36V CLK-IN)

High Voltage Series (45V CLK-IN)

Microstep Series (36V CLK-IN)

High Reliability Series (36V CLK-IN)

High Reliability Series (36V PARALLEL-IN)

BD63876EFV (2.0A) BD63877EFV (2.0A)

BD63874EFV (1.5A) BD63875EFV (1.5A)

BD63872EFV (1.0A) BD63873EFV (1.0A)

BD63847EFV (2.0A)

BD63843EFV (1.0A)

BD63801EFV (0.8A)

Development Trend

BD6423EFV (1.0A)BD6425EFV (1.5A)

BD63877EFV (2.0A) BD63875EFV (1.5A) BD63873EFV (1.0A)

BD63847EFV (2.0A) BD63843EFV (1.0A)

BD6381EFV (1.2A) BD6380EFV (0.8A)

BD6290EFV (0.8A)

BD63876EFV (2.0A) BD63874EFV (1.5A) BD63872EFV (1.0A)

Advantages• Identical pin-out configuration and package throughout entire series• Easy thermal design/standardization• Enables driver replacement in final step of design phase• Short development cycle and reduced risk related to motor change• Optimal driver available for virtually any motor spec• Low price

BD63860EFV (2.5A)

BD63801EFV (0.8A)

Standard Series

Low Voltage Series (PARALLEL-IN)

High Voltage Series (CLK-IN)

Microstep Series (CLK-IN)

High Reliability Series (CLK-IN)

High Reliability Series (PARALLEL-IN)← Package & Pin Compatible← Package & Pin Compatible

63847 & 63843 are Package & Pin Compatible

Series Compatibility

Package Benefits

Conventional ROHM

2.2W 4.0W

Unit: mm

Performance and Reliability

Technology Protection

Safety

• Single power supply• Ghost Supply Prevention (GSP)• Mixed Decay Mode• Linearly variable fast/slow decay ratio • Pin-compatible lineup• Bipolar PWM constant current drive• Thin, compact power package• Power DMOS

• Over-Current Protection (OCP)• Thermal Shutdown (TSD)• Under-/Over-Voltage Lockout (UVLO/OVLO)

• IC reverse polarity protection• High ESD resistance: 4000V (HBM)/400V (MM)• IC pin short protection• No charge pump

Vcc

Dual Power Supply Single Power Supply

Logic Driver

VM

InternalRegulator Driver

VM

Logic

Advantages• No separate power supply required for logic (reduces external component count - no bypass

capacitor needed)• Simplifies power up/down sequence• Simplifies PCB layout and routing

Note: Does not apply to low voltage solutions

Single Power Supply Drive

Malfunctions No Malfunctions

Advantages• Prevents malfunctions in motor driver IC and other ICs on the same supply line (Vcc)• Simplifies power up/down sequence

Vcc

Micro-controller

GND

input

Vcc = Vinput-１ Vf Vcc

Micro-controller

GND

inputNo Pass Route

Ghost Supply Prevention (GSP)

Output Current (in Quarter Steps)

Slow Decay

Mix Decay

- Better

Output current is distorted during current ramp-down

Vibration / NoiseMix Decay

- BetterVDS adjusts to motor and control

signals=

Improved characteristics

Linearly Variable Fast/Slow Decay Ratio

Out

put C

urre

nt (5

A/D

IV)

Without OCP

Failure

Short-Circuit

(200 μsec/DIV)

Instantaneous Protection

Short-Circuit

Out

put C

urre

nt (5

A/D

IV)

(200 μsec/DIV)

4 µs

With OCP

Advantages• Provides better, more reliable protection than a fuse• Latch-type OCP provides instantaneous protection

Over-Current Protection (OCP)

Image of chip damaged due to overcurrent

Advantages• Fewer external components (eliminates 2+ high-voltage electrolytic capacitors)• High resistance to failure• Reduced EMI

CP1

Pre-Driver

Nch

Nch

VG

OUT

RNF

CP2

Vcc

Pre-Driver

Nch

OUT

RNF

Vcc

Pch

Charge Pump Circuit

No Charge Pump

4.7 w

Features• Supply voltage: 36V Vcc (internal voltage

regulator)• DMOS output (Pch + Nch) (1.0A Io max.:

BD63843EFV / 2.0A max.: BD63847EFV)• Constant current PWM driver• Serial/CLK IN with built-in translator• No charge pump required• Full-/Half-/Eighth-/Sixteenth-step• Mixed/Auto decay modes• Linearly variable fast/slow decay ratio• Integrated 4-bit DAC• Multiple protection functions:

TSD/UVLO/OVLO/OCP• HTSSOP-B28 package

BD63843/47EFV (Microstep / 36V)Block Diagram

VM1

VLIM2

CR2

VCC

IN1AIN1B

CR1

IN2AIN2B

VLIM1

OUT1B

SENSE1

RNF1

VM2

SENSE2

OUT2B

RNF2

39kΩ 1000pF

39kΩ 1000pF

0.3Ω

0.3Ω

Predriver

Current Limit Comp.

9

CRTimer

Current Limit Comp.

CRTimer Predriver

TSD

UVLO

GND

20

6

7

5

19

18

11

4

12

16

15

21

14

13

10

47uF 0.1uF

4.7uF 0.1uF

VREF 23

PS 2

Logic

22

3

VREF

OCP

24

1

OUT2A

OUT1A

Features• Wide supply voltage range

• Vcc: 2.5 - 5.5V• VM1,2: 4 - 13.5V (BD6380EFV),

6 - 13.5V (BD6381EFV)• DMOS output

• Io (max): 0.8A (BD6380EFV)• Io (max): 1.2A (BD6381EFV)

• Constant current PWM driver (Fixed Off Time Type)

• Reference voltage: 1V ± 3%• Multiple protection functions:

• TSD/UVLO/OCP• Crossover current protection• IC pin short protection

• Standby current: ~ 0µA• HTSSOP-B24 package

BD638xEFV Series (Low Voltage Type)Block Diagram

Features• Supply voltage: 42V Vcc (Internal

voltage regulator)• Output current

• Io (max): 1.5 A (BD6425EFV)• Io (max): 1.0 A (BD6423EFV)

• Constant current PWM driver• Multiple protection functions

• TSD/UVLO/OCP• IC pin short protection• 8kV ESD resistance

• HTSSOP-B28 package (BD6425EFV)

• HTSSOP-B24 package (BD6423EFV)

BD6425EFV Block Diagram & Application Circuit

BD642xEFV Series (High Voltage Type)

Comprehensive Support System

IC SelectionROHM’s short form catalog and component-specific selection guides facilitate quick and easy selection of potential solutions for customer applications.

Testing & EvaluationDetailed technical notes allow design engineers to assess the capabilities and benefits of ROHM’s solutions. Evaluation hardware is available upon request.

Integration of ROHM’s Solutions in Customer ApplicationsROHM’s tech notes address numerous design topics. E-mail support is available to assist with issues such as board layout/routing and external component selection.

Support is available at all stages of product test/evaluation and during the design process. Feel free to consult with us on any matter.

Operational AnalysisROHM engineers can provide performance improvement recommendations by analyzing customer designs.

TroubleshootingROHM provides services such as evaluation of customer board layout/routing and testing via EMI scan.

Failure ResolutionROHM’s Quality Assurance Centers will issue a preliminary report within 24 hours of receipt of suspect components. Analysis and failure reproduction will then be conducted and relevant precautions/countermeasures recommended.

Chemical ComplianceROHM complies with all major substance directives and regulations

» Restriction of Hazardous Substances (RoHS)» Deca BDE / PFOS» Registration Evaluation Authorization of Chemicals (REACH)» Halogen-free (HF)

REACH StatementSample RoHS-Compliant Product List

Online Support: www.ROHM.comA number of support tools are available for many P/Ns:»Detailed materials composition»Technical notes (for ICs)»Supplementary information (FAQs)»Design simulation tool

» A focus on integration along with package and pin compatibility has resulted in a product offering which has eased the burden on designers

» Through the use of packaging with a bottom side heat sink and the availability of features such as serial CLK IN clock signal control, ROHM has been able to reduction the size and complexity of its drivers

» Elimination of the ghost supply path has improved operational reliability while the addition of overcurrent protection combined with robust resistance to ESD has made ROHM stepper motor drivers less prone to failure

» Expansion of the product offering to include microstep and high voltage solutions has allowed ROHM to branch out into applications that were previously out of reach

Summary