ROHM BD6425EFV Technical data

A

Stepping Motor Driver series

High Voltage Series
Stepping Motor Drivers

BD6422EFV (PARALLEL-IN type)
BD6425, BD6423EFV (CLK-IN type)

●Description

These products are a low power consumption PWM constant current-drive driver of bipolar stepping motor with power
supply’s rated voltage of 45V and rated output current of 1.0A, 1.5A.

●Feature

1) Power supply: one system drive (rated voltage of 45V)

2) Rated output current: 1.0A, 1.5A

3) Low ON resistance DMOS output

4) CLK-IN drive mode (BD6425/6423EFV)

5) Parallel IN drive mode (BD6422EFV)

6) PWM constant current control (other oscillation)

7) Built-in spike noise blanking function (external noise filter is unnecessary)

8) FULL STEP & HALF STEP (two kinds), applicable to QUARTER STEP

9) Current decay mode switching function (4 kinds of FAST/SLOW DECAY ratio)

10) Normal rotation & reverse rotation switching function (BD6425/6423EFV)

11) Power save function

12) Built-in logic input pull-down resistor

13) Power-on reset function(BD6425/6423EFV)

14) Thermal shutdown circuit (TSD)

15) Over current protection circuit (OCP)

16) Under voltage lock out circuit (UVLO)

17) Malfunction prevention at the time of no applied power supply (Ghost Supply Prevention)

18) Electrostatic discharge: 8kV (HBM specification)

19) Microminiature, ultra-thin and high heat-radiation (exposed metal type) HTSSOP package

●Application
serial dot impact printer､sewing machine etc.

●Absolute maximum ratings(Ta=25℃)

Item Symbol BD6425EFV BD6423/6422EFV Unit

Supply voltage V

Power dissipation Pd

Input voltage for control pin VIN -0.2～+5.5 -0.2～+5.5 V

RNF maximum voltage V

Maximum output current I

Operating temperature range T

Storage temperature range T

Junction temperature T

※1 70mm×70mm×1.6mm glass epoxy board. Derating in done at 11.6mW/℃ for operating above Ta=25℃.
※2 4-layer recommended board. Derating in done at 37.6mW/℃ for operating above Ta=25℃.
※3 70mm×70mm×1.6mm glass epoxy board. Derating in done at 8.8mW/℃ for operating above Ta=25℃.
※4 4-layer recommended board. Derating in done at 32.0mW/℃ for operating above Ta=25℃.
※5 Do not, however exceed Pd, ASO and Tjmax=150℃.

-0.2～+45.0 -0.2～+45.0 V

CC1,2

0.7 0.7 V

RNF

1.5

OUT

-25～+85 -25～+85 ℃

opr

-55～+150 -55～+150 ℃

stg

+150 +150 ℃

jmax

1

※

1.45

1.1

2

※

4.70

4.0

5

※

1.0

3

※

4

※

5

※

A/phase

No.12009EAT06

W

W

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© 2012 ROHM Co., Ltd. All rights reserved.

1/8

2012.02 - Rev.

BD6422EFV, BD6423EFV, BD6425EFV

A

●Operating conditions( (Ta= -25～+85℃)

Item Symbol BD6425EFV BD6423/6422EFV Unit

Supply voltage V

Maximum Output current (DC) I

※6 Do not however exceed Pd, ASO.

19~42 V

CC1,2

1.2

OUT

6

※

0.7

●Electrical characteristics (Unless otherwise specified Ta=25℃､V

Item Symbol

Min. Typ. Max.

Whole

Circuit current at standby
Circuit current

I

CCST

ICC - 2.0 5.0 mA PS=H, VREF=3V

- 1.0 2.5 mA PS=L

Control input

V

H level input voltage
L level input voltage
H level input current
L level input current

2.0 - - V

INH

V

- - 0.8 V

INL

I

35 50 100 μAVIN=5V

INH

I

-10 0 - μAVIN=0V

INL

Output (OUT1A, OUT1B, OUT2A, OUT2B)

Output ON resistance(BD6425EFV)
Output ON resistance(BD6423/6422EFV)
Output leak current

RON - 1.10 1.43 Ω I
R

- 2.00 2.60 Ω I

ON

I

- - 10 μA

LEAK

Current control

RNFXS input current (BD6425EFV)
RNFX input current
VREF input current
VREF input voltage range
Minimum on time (Blank time)

I

RNFS

I

RNF

I

VREF

V

REF

t

ONMIN

-2.0 -0.1 - μA RNFXS=0V

-40 -20 - μA RNFX=0V

-2.0 -0.1 - μAVREF=0V

0 - 3.0 V

0.5 1.5 3.0 μs C=470pF, R=82kΩ

BD6425/6423EFV

Comparator threshold

V

CTH

0.57 0.60 0.63 V VREF=3V

BD6422EFV

Comparator threshold 100% V
Comparator threshold 67% V
Comparator threshold 33% V

CTH100

CTH67

CTH33

0.57 0.60 0.63 V VREF=3V, (I0X,I1X)=(L,L)

0.38 0.40 0.42 V VREF=3V, (I0X,I1X)=(H,L)

0.18 0.20 0.22 V VREF=3V, (I0X,I1X)=(L,H)

CC1,2

=37V)

Limit

6

※

A/phase

Unit Condition

=1.0A,Sum of upper and lower

OUT

=0.5A,Sum of upper and lower

OUT

Technical Note

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© 2012 ROHM Co., Ltd. All rights reserved.

2/8

2012.02 - Rev.

BD6422EFV, BD6423EFV, BD6425EFV

A

●Terminal function and Application circuit diagram

1) BD6425EFV

Pin

Pin name Function

No.

Technical Note

Pin

Pin name Function

No.

1 GND Ground terminal 15 CLK

Clock input terminal for advancing the
electrical angle.

2 OUT1B H bridge output terminal 16 CW_CCW Motor rotating direction setting terminal

3 RNF1

Connection terminal of resistor for output
current detection

17 TEST

Terminal for testing
(used by connecting with GND)

4 RNF1S Input terminal of current limit comparator 18 MODE0 Motor excitation mode setting terminal

5 OUT1A H bridge output terminal 19 MODE1 Motor excitation mode setting terminal

6 NC Non connection 20 ENABLE Power supply terminal

7 VCC1 Power supply terminal 21 NC Non connection

8 NC Non connection 22 VCC2 Power supply terminal

9 GND Ground terminal 23 NC Non connection

10 CR

Connection terminal of CR for setting
chopping frequency

24 OUT2A H bridge output terminal

11 DEC1 Current decay mode setting terminal 25 RNF2S Input terminal of current limit comparator

12 DEC2 Current decay mode setting terminal 26 RNF2

Connection terminal of resistor for output
current detection

13 VREF Output current value setting terminal 27 OUT2B H bridge output terminal

14 PS Power save terminal 28 NC Non connection

Logic input terminal.

Set the output currenet.
Input by resistor divison.

Set the chopping
frequency.
Setting range is
C:330pF～1500pF
R:15kΩ～200kΩ

82kΩ

Logic input terminal.
for setting current decay mode

470pF

CW_CCW

MODE1

ENABLE

VREF 13

CR

TEST

15 CLK

16

18 MODE0

19

20

10

11 DEC1

12 DEC2

17

Translator

＋
－

RNF1

RNF2

Blank time

PWM control

Mix decay

2bit DAC

＋
－

＋
－

OSC

control

Terminal for testing.
Please connect to GND.

RESET

Control logic

Regulator

Predriver

UVLO

TSD

OCP

9

14

7

5

2

3

4

22

24

27

26

25

1

GND

PS

VCC1

OUT1A

OUT1B

RNF1

RNF1S
VCC2

OUT2A

OUT2B

RNF2

RNF1S

GND

Power save terminal.

Bypass capacitor.
Setting range is
100uF～470uF(electrolytic)

0.01uF～0.1uF(multilayer ceramic etc.)
Be sure to short VCC1 & VCC2.

0.3Ω

0.3Ω

100uF

Resistor for current. detecting.
Setting range is

0.2Ω～0.4Ω.

Resistor for current. detecting.
Setting range is

0.2Ω～0.4Ω.

0.1uF

Fig.1 Block diagram & Application circuit diagram of BD6425EFV

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© 2012 ROHM Co., Ltd. All rights reserved.

3/8

2012.02 - Rev.