ON Semiconductor LV8731V User Manual

PWM Constant-Current Control Stepper Motor

Driver

Monolithic Linear IC

LV8731V

Overview

The LV8731V is a 2−channel H−bridge driver IC that can switch a stepper motor driver, which supports micro−step drive with 1/16−step resolution, and two channels of a brushed motor driver, which supports forward, reverse, brake, and standby of a motor. It is ideally suited for driving brushed DC motors and stepper motors used in office equipment and amusement applications.

Function

• Single−channel PWM Current Control Stepper Motor Driver

(Selectable with DC Motor Driver Channel 2) Incorporated

• BiCDMOS Process IC

• Low on Resistance (Upper Side: 0.3 ; Lower Side: 0.25 ;

Total of Upper and Lower: 0.55 ; T

= 25°C, I

• Micro−step Mode can be Set to Full−step, Half−step, Quarter−step, or

1/16−step

• Excitation Step Proceeds Only by Step Signal Input

• Motor Current Selectable in Four Steps

• Output Short−circuit Protection Circuit (Selectable from Latch−type

or Auto−reset−type) Incorporated

• Unusual Condition Warning Output Pins

• No Control Power Supply Required

= 2 A)

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SSOP44K

CASE 940AF

MARKING DIAGRAM

LV8731

YMWL

Y = Year of Production, Last Number M = Assembly Operation Month WL = Wafer Lot Number

February, 2021 − Rev. 6

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 26 of this data sheet.

1 Publication Order Number:

LV8731V/D

LV8731V

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS at T

= 25°C

Parameter Symbol Conditions Ratings Unit

Supply Voltage VM max VM, VM1, VM2 36 V

Output Peak Current IO peak Tw ≤ 10 ms, duty 20%, Per 1ch 2.5 A

Output Current IO max Per 1ch 2 A

Logic Input Voltage V

ATT1, ATT2, EMM, RST/BLK, STEP/DC22, FR/DC21, MD2/DC12, MD1/DC11, DM, OE, ST

−0.3 to +6 V

MONI/EMO Input Voltage Vmoni/Vemo −0.3 to +6 V

Allowable Power Dissipation Pd max (Note 1) 3.25 W

Operating Temperature Topr −40 to +85 °C

Storage Temperature Tstg −55 to +150 °C

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.

1. Specified circuit board : 90.0 mm × 90.0 mm × 1.6 mm, glass epoxy 2−layer board, with backside mounting.

2. Caution 1: Absolute maximum ratings represent the value which cannot be exceeded for any length of time.

3. Caution 2: Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high

temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.

ALLOWABLE OPERATING RATINGS T

= 25°C

Parameter Symbol Conditions Ratings Unit

Supply Voltage Range VM VM, VM1, VM2 8 to 32 V

Logic Input Voltage V

ATT1, ATT2, EMM, RST/BLK, STEP/DC22,

0 to 5.5 V

FR/DC21, MD2/DC12, MD1/DC11, DM, OE, ST

VREF Input Voltage Range VREF 0 to 3 V

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability.

ELECTRICAL CHARACTERISTICS T

= 25°C, VM = 24 V, VREF = 1.5 V

Ratings

Parameter

Symbol Conditions

Min Typ Max

Unit

Standby Mode Current Drain IMstn ST = “L”, I(VM) + I(VM1) + I(VM2) 100 400

Current Drain IM ST = “H”, OE = “L”, with no load

3.2 5 mA

I(VM) + I(VM1) + I(VM2)

VREG5 Output Voltage Vreg5 IO = −1 mA 4.5 5 5.5 V

Thermal Shutdown Temperature TSD Design guarantee 150 180 200 °C

Thermal Hysteresis Width

TSD

Design guarantee 40 °C

MOTOR DRIVER

Output On Resistance

Ronu IO = 2 A, Upper−side on resistance 0.3 0.4

Rond IO = 2 A, Lower−side on resistance 0.25 0.33

Output Leakage Current IOleak 50

Diode Forward Voltage VD ID = −2 A 1.2 1.4 V

Logic Pin Input Current

IINL ATT1, ATT2, EMM, RST/BLK,

4 8 12 STEP/DC22, FR/DC21, MD2/DC12, MD1/DC11, DM, OE, ST,

= 0.8 V

IINH VIN = 5 V 30 50 70

A



A

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LV8731V

ELECTRICAL CHARACTERISTICS (continued) T

Parameter Unit

Logic Input Voltage

Current Setting Comparator Threshold Voltage

(Current Step Switching)

Current Setting Comparator Threshold Voltage (Current Attenuation Rate Switching)

Chopping Frequency Fchop Cchop = 200 pF 40 50 60 kHz

CHOP Pin Charge/Discharge Current Ichop 7 10 13

Chopping Oscillation Circuit Threshold Voltage

VREF Pin Input Current Iref VREF = 1.5 V −0.5

MONI Pin Saturation Voltage Vsatmon Imoni = 1 mA 400 mV

CHARGE PUMP

VG Output Voltage

Rise Time tONG VG = 0.1 mF, Between CP1−CP2

Oscillator Frequency Fosc 90 125 150 kHz

High VINh

Low VINl 0 0.8 V

1/16 step resolution

Quarter step resolution

Half step resolution

Full step resolution

= 25°C, VM = 24 V, VREF = 1.5 V

Ratings

ConditionsSymbol

ATT1, ATT2, EMM, RST/BLK, STEP/DC22, FR/DC21, MD2/DC12, MD1/DC11, DM, OE, ST

Vtdac0_4W Step 0 (When initialized: channel 1

comparator level)

Vtdac1_4W Step 1 (Initial state + 1) 0.291 0.3 0.309 V

Vtdac2_4W Step 2 (Initial state + 2) 0.285 0.294 0.303 V

Vtdac3_4W Step 3 (Initial state + 3) 0.279 0.288 0.297 V

Vtdac4_4W Step 4 (Initial state + 4) 0.267 0.276 0.285 V

Vtdac5_4W Step 5 (Initial state + 5) 0.255 0.264 0.273 V

Vtdac6_4W Step 6 (Initial state + 6) 0.240 0.249 0.258 V

Vtdac7_4W Step 7 (Initial state + 7) 0.222 0.231 0.240 V

Vtdac8_4W Step 8 (Initial state + 8) 0.201 0.21 0.219 V

Vtdac9_4W Step 9 (Initial state + 9) 0.180 0.189 0.198 V

Vtdac10_4W Step 10 (Initial state + 10) 0.157 0.165 0.173 V

Vtdac11_4W Step 11 (Initial state + 11) 0.134 0.141 0.148 V

Vtdac12_4W Step 12 (Initial state + 12) 0.107 0.114 0.121 V

Vtdac13_4W Step 13 (Initial state + 13) 0.080 0.087 0.094 V

Vtdac14_4W Step 14 (Initial state + 14) 0.053 0.06 0.067 V

Vtdac15_4W Step 15 (Initial state + 15) 0.023 0.03 0.037 V

Vtdac0_W Step 0 (When initialized : channel 1

comparator level)

Vtdac4_W Step 4 (Initial state + 1) 0.267 0.276 0.285 V

Vtdac8_W Step 8 (Initial state + 2) 0.201 0.21 0.219 V

Vtdac12_W Step 12 (Initial state + 3) 0.107 0.114 0.121 V

Vtdac0_H Step 0 (When initialized : channel 1

comparator level)

Vtdac8_H Step 8 (Initial state + 1) 0.201 0.21 0.219 V

Vtdac8_F Step 8’ (When initialized : channel 1

comparator level)

Vtatt00 ATT1 = L, ATT2 = L 0.291 0.3 0.309 V

Vtatt01 ATT1 = H, ATT2 = L 0.232 0.24 0.248 V

Vtatt10 ATT1 = L, ATT2 = H 0.143 0.15 0.157 V

Vtatt11 ATT1 = H, ATT2 = H 0.053 0.06 0.067 V

Vtup 0.8 1 1.2 V

Vtdown 0.4 0.5 0.6 V

VG 28 28.7 29.8 V

0.1 F ST = “H” →VG = VM + 4 V

2.0 5.5 V

0.291 0.3 0.309 V

200 500

MaxTypMin

A

S

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LV8731V

ELECTRICAL CHARACTERISTICS (continued) T

Parameter Unit

OUTPUT SHORT−CIRCUIT PROTECTION

EMO Pin Saturation Voltage

CEM Pin Charge Current Icem Vcem = 0 V 7 10 13

CEM Pin Threshold Voltage Vtcem 0.8 1 1.2 V

4.0

*1 With components mounted on the exposed die−pad board *2 With no components mounted on the exposed die−pad board

Two−layer circuit board 1 *1

3.25

3.0

Two−layer circuit board 2 *2

2.20

2.0

1.0

Allowable power dissipation, Pd max − W

−20 0 20 40 60 80 100

= 25°C, VM = 24 V, VREF = 1.5 V

Ratings

ConditionsSymbol

Vsatemo Iemo = 1 mA 400 mV

Pd max − T

Ambient temperature, TA − °C

1.69

1.14

MaxTypMin

Figure 1. Power Dissipation vs Ambient Temperature Characteristic

A

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LV8731V

Substrate Specifications (Substrate recommended for operation of LV8731V)

Size: 90 mm × 90 mm × 1.6 mm (two−layer substrate [2S0P]) Material: Glass epoxy Copper wiring density: L1 = 85% / L2 = 90%

Figure 2. L1: Copper Wiring Pattern Diagram Figure 3. L2: Copper Wiring Pattern Diagram

Cautions

1. The data for the case with the Exposed Die−Pad substrate mounted shows the values when 90% or more of the Exposed Die−Pad is wet

2. For the set design, employ the derating design with sufficient margin. Stresses to be derated include the voltage, current, junction temperature, power loss, and mechanical stresses such as vibration, impact, and tension. Accordingly, the design must ensure these stresses to be as low or small as possible. The guideline for ordinary derating is shown below :

(1) Maximum value 80% or less for the voltage

rating

(2) Maximum value 80% or less for the current

rating

(3) Maximum value 80% or less for the

temperature rating

3. After the set design, be sure to verify the design with the actual product. Confirm the solder joint state and verify also the reliability of solder joint for the Exposed Die−Pad, etc. Any void or deterioration, if observed in the solder joint of these parts, causes deteriorated thermal conduction, possibly resulting in thermal destruction of IC

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LV8731V

PIN ASSIGNMENT

CP2

CP1

VREG5

ATT2

ATT1

EMO

CEM

EMM

CHOP

MONI

RST/BLK

STEP/DC22

LV8731V

OUT1A

PGND

VM1

RF1

OUT1B

OUT2A

RF2

FR/DC21

MD2/DC12

MD1/DC11

VREF

GND

Top View

Figure 4. Pin Assignment

RF2

VM2

PGND

OUT2B

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LV8731V

BLOCK DIAGRAM

RF2OUT2BOUT2AVM2

OUTBOUTARFVGCFCP2

Output Preamplifier

Stage

Output Preamplifier

Stage

Output Preamplifier

Stage

Output Preamplifier

Stage

EMO

CEM

Current

(4W1−2/

selection

Output Control Logic

Current

(4W1−2/

selection

W1−2/1−2/2)

OE DM EMM

BLK

RST/

DC22

STEP

FR/

DC21

MD2/

DC12

DC11

Charge Pump

Regulator

MONI

PGND

VREG5

Figure 5. Block Diagram

(4 levels

Attenuator

selectable)

Oscillation

VREF

Circuit

GND

TSD

CHOP ST ATT1 ATT2 MD1/

LVS

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PIN FUNCTIONS

Pin No.

6 7

18 19

20 ST Chip enable pin

Pin Name Pin Function Equivalent Circuit

ATT2 ATT1 EMM

RST/BLK

STEP/DC22

FR/DC21

MD2/DC12

MD1/DC11

DM OE

Motor holding current switching pin Motor holding current switching pin Output short−circuit protection mode switching pin RESET input pin (STM) / Blanking time switching pin (DCM) STEP signal input pin (STM) / Channel 2 output control input pin 2 (DCM) CW / CCW signal input pin (STM) / Channel 2 output control input pin 1 (DCM) Excitation mode switching pin 2 (STM) / Channel 1 output control input pin 2 (DCM) Excitation mode switching pin 1 (STM) / Channel 1 output control input pin 1 (DCM) Drive mode (STM/DCM) switching pin Output enable signal input pin

LV8731V

VREG5

10 k

100 k

GND

VREG5

23, 24 25, 42 28, 29

30, 31

32, 33 34, 35 36, 37

38, 39 43, 44

OUT2B

PGND

VM2

RF2

OUT2A OUT1B

RF1

VM1

OUT1A

Channel 2 OUTB output pin Power system ground Channel 2 motor power supply connection pin

Channel 2 current−sense resistor connection pin Channel 2 OUTA output pin Channel 1 OUTB output pin Channel 1 current−sense resistor connection pin Channel 1 motor power supply pin Channel 1 OUTA output pin

GND

10 k

20 k

10 k

80 k

500 

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PIN FUNCTIONS (continued)

Pin No. Equivalent CircuitPin FunctionPin Name

1 2 3 4

VM CP2 CP1

LV8731V

Charge pump capacitor connection pin Motor power supply connection pin Charge pump capacitor connection pin Charge pump capacitor connection pin

VREG5

100 

GND

21 VREF Constant current control reference volt-

5 VREG5 Internal power supply capacitor con-

EMO

MONI

age input pin

nection pin

Output short−circuit state warning output pin Position detection monitor pin

VREG5

500 

GND

2 k

78 k

26 k

GND

VREG5

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GND

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ON Semiconductor LV8731V User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual