Sanyo STK672-040 Specifications

Ordering number : ENN5227B

60200RM (OT) No. 5227-1/19

Overview

The STK672-040 is a stepping motor driver hybrid IC that
uses power MOSFETs in the output stage. It includes a
built-in microstepping controller and is based on a
unipolar constant-current PWM system. The STK672-040
supports application simplification and standardization by
providing a built-in 4 phase distribution stepping motor
controller. It supports five excitation methods: 2 phase,
1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase
excitations, and can provide control of the basic stepping
angle of the stepping motor divided into 1/16 step units. It
also allows the motor speed to be controlled with only a
clock signal.
The use of this hybrid IC allows designers to implement
systems that provide high motor torques, low vibration
levels, low noise, fast response, and high-efficiency drive.
Compared to the earlier Sanyo STK672-010 Series, the
STK672-040 features a smaller package, fewer external
components, and controller improvements for even higher
efficiency and even higher performance microstepping
motor drive.

Applications

• Facsimile stepping motor drive (send and receive)

• Paper feed and optical system stepping motor drive in
copiers

• Laser printer drum drive

• Printer carriage stepping motor drive

• X-Y plotter pen drive

• Industrial robots and other stepping motor applications

Features

• Can implement stepping motor drive systems simply by
providing a DC power supply and a clock pulse
generator.

<Control Block Features>

• One of five drive types can be selected with the drive
mode settings (M1, M2, and M3)
—2 phase excitation drive
—1-2 phase excitation drive
—W1-2 phase excitation drive
—2W1-2 phase excitation drive
—4W1-2 phase excitation drive

• Provides four freely selectable modes for the vector
locus during microstepping drive: circular mode, one
inside mode, and two outside modes.

• Phase retention even if excitation is switched.

• The excitation phase state can be verified in real time
from the MO1, MO2, and MOI signal output pins.

• The CLK input counter block can be selected to be one
of the following by the high/low setting of the M3 input
pin.
—Rising edge only
—Both rising and falling edges

Note*: Conditions: VCC1 = 24 V, IOH= 1.5 A, 2W1-2 drive

used.

Continued on next page.

Package Dimensions

unit: mm

4161

122

53.0

21

×

2 = 42

0.5

2.0

22.0

9.0

0.4

2.9

4.0

1.0

[STK672-040]

STK672-040

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Stepping Motor Driver (Sine Wave Drive) Output Current: 1.5 A (No Heat Sink*)

Unipolar constant-current chopper (external excitation PWM) circuit with built-in microstepping controller

Thick-Film Hybrid IC

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.

• The CLK and RETURN input pins include built-in
malfunction prevention circuits for external pulse noise.

• ENABLE and RESET pins provided. These are Schmitt
trigger inputs with built-in 20 kΩ (typical) pull-up
resistors.

• No noise generation due to the difference between the A
and B phase time constants during motor hold since
external excitation is used.

• Microstepping operation supported even for small motor
currents, since the reference voltage Vref can be set to
any value between 0 V and 1/2VCC2.

<Driver Block>

• External excitation PWM drive allows a wide operating
supply voltage range (VCC1 = 10 to 45 V) to be used.

• Current detection resistor (0.33 Ω) built into the hybrid
IC.

• Power MOSFETs for minimal driver loss

• Motor output drive currents IOHup to 1.5 A.

No. 5227-2/19

STK672-040

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage 1 V

CC

1 max No signal 52 V

Maximum supply voltage 2 V

CC

2 max No signal –0.3 to +7.0 V

Input voltage V

IN

max Logic input pins –0.3 to +7.0 V

Phase output current I

OH

max

0.5 seconds, single pulse, with V

CC

1 applied.

2.2 A

Load: R = 5 Ω, L = 10 mH for each phase.
Repeatable avalanche Ear max 38 mJ
Power loss Pd max θc-a = 0 12 W
Operating temperature Tc max 105 °C
Junction temperature Tj max 150 °C
Storage temperature Tstg –40 to +125 °C

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Supply voltage 1 V

CC

1 With input signals present 10 to 45 V

Supply voltage 2 V

CC

2 With input signals present 5 ±5% V

Input voltage V

IH

0 to VCC2V

Phase driver voltage handling V

DSS

Tr1, 2, 3, and 4 (the A, A, B, and B outputs) 100 (min) V
Phase current I

OH

max Duty 50% 1.5 (max) A

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions

Ratings

Unit

min typ max

Control supply current I

CC

Pin 7, with ENABLE pin held low. 4.5 15 mA

Output saturation voltage Vsat R

L

= 15 Ω (I ≈ 1.5 A) 1.4 1.9 V

Average output current Io ave

Load: R = 3.5 W/L = 3.8 mH

0.465 0.517 0.569 A

For each phase, Vref ≈ 1 V

FET diode forward voltage Vdf If = 1 A 1.2 1.8 V

[Control Inputs]

Input voltage

V

IH

Except for the Vref pin 4 V

V

IL

Except for the Vref pin 1 V

Input current

I

IH

Except for the Vref pin 0 1 10 µA

I

IL

Except for the Vref pin 125 250 510 µA

[Vref Input Pin]

Input voltage V

I

Pin 8 0 2.5 V

Input current I

I

Pin 8 1µA

[Control Outputs]

Output voltage

V

OH

I = –3 mA, pins MOI, MO1, MO2 2.4 V

V

OL

I = +3 mA, pins MOI, MO1, MO2 0.4 V

Electrical Characteristics at Tc = 25°C, VCC1 = 24 V, VCC2 = 5 V

Continued on next page.

Continued from preceding page.

No. 5227-3/19

STK672-040

Parameter Symbol Conditions

Ratings

Unit

min typ max

[Current Distribution Ratio (A·B)]

2W1-2, W1-2, 1-2 Vref θ = 1/8 100 %
2W1-2, W1-2 Vref θ = 2/8 92 %
2W1-2 Vref θ = 3/8 83 %
2W1-2, W1-2, 1-2 Vref θ = 4/8 71 %
2W1-2 Vref θ = 5/8 55 %
2W1-2, W1-2 Vref θ = 6/8 40 %
2W1-2 Vref θ = 7/8 20 %
2 Vref 100 %
PWM frequency fc 37 47 57 kHz

Continued from preceding page.

Note: A constant-voltage power supply must be used.

The design target value is shown for the current distribution ratio.

21

20

19

16

18

22

17

11

14

15

10

9

7 12 13 8 6 5 2 1

+

–

+

–

+

–

+

–

+

–

3

4

M1

M2

CWB

CLK

M3

RETURN

RESET

MoI

Mo1

Mo2

ENABLE

SG

SUB

PG

BBAAVrefM5M4V

CC

2

Excitation mode

control

Excitation state monitor

Phase

advance

counter

Current

distribution

ratio switching

Pseudo-sine

wave generator

Rise detection

RC oscillator PWM control

Reference clock

generation

Phase excitation drive

signal generation

Rise/fall

detection and switching

A12389

Internal Block Diagram

No. 5227-4/19

STK672-040

Test Circuit Diagrams

No. 5227-5/19

STK672-040

14

9

10

8

16

22

3

4

1

2

5

6

A

15 Ω

A
B

B

7

+

VCC2

VCC2

STK672-040

Start

Vref = 2.5 V

V

22

3

4

1

2

5

6

A
A
B
B

7

VCC1

STK672-040

V

A

A12390

14

9

10

8

16

22

1

5

2

6

A

abab

A
B

SW2

SW1

B

7

18

+

VCC2

VCC2

VCC1

VCC1

STK672-040

Start

Vref = 1 V 0 V

0 V

Low when
measuring I

CC

5 V

A12393

9

22

7

A

VCC2

M1

STK672-040

A12392

A12391

10

M2

11

M3

12

M4

13

M5

14

CLK

14
1415

CWB

1416

RESET

1417

RETURN

1418

ENABLE

148

Vref

A

A

I

IL

I

IH

Vsat Vdf

IIH, I

IL

Ioave, Icc, fc

When measuring Io ave: With SW1 set to ‘a’, Vref = 1 V
When measuring fc: With SW1 set to ‘b’, Vref = 0 V
When measuring Icc: Set ENABLE low.

No. 5227-6/19

STK672-040

9

22

8

6

A
A

7

141410
141411
141412
141413
141415
14
18
16
17
19
20
21

+

+

VCC2 = 5 V

VCC2 = 5 V

SG

100 µF or higher

PG

Vref

VCC2 = 5 V

1 kΩ

CLK

ENABLE

RET

RESET

MoI
Mo1
Mo2

VCC1 = 10 V to 45 V

Two-phase stepping motor

STK672-040

A12394

B
B

5
2
1

3
4

0 A

Motor current waveform

Ioave

A12395

IOLI

OH

Note: This hybrid IC must be initialized with a power on reset when power is first applied.

Operation Description

2W1-2 Phase Excitation Drive (microstepping operation)

[Setting the Motor Current]
The motor current IOHis set by the Vref voltage on the hybrid IC pin 8. The following formula gives the relationship
between IOHand Vref.

1

IOH=—× Vref/Rs, Rs: The hybrid IC internal current detection resistor (0.33 Ω ±3%)

3

Applications can use motor currents from the current (0.05 to 0.1 A) set by the duty of the frequency set by the oscillator
up to the limit of the allowable operating range, IOH= 1.5 A

[Function Table]

M20011
M1

0101

Phase switching clock edge timing

M3

1 2 phase excitation 1-2 phase excitation W1-2 phase excitation 2W1-2 phase excitation Rising edge only
0 1-2 phase excitation W1-2 phase excitation 2W1-2 phase excitation 4W1-2 phase excitation Rising and falling edges

Forward Reverse

CWB 0 1

AABB
Mo11001
Mo20011

ENABLE Motor current is cut off when low

RESET Active low