Sanyo STK672-080 Specifications

Ordering number : ENN6507

22002TN (OT) No. 6507-1/17

Overview

The STK672-080 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 STK672-080
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 STK672-050, the
STK672-080 features a significantly smaller package for
easier mounting in end products.

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

• Phase retention even if excitation is switched.

• The MOI phase origin monitor pin is provided.

• 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= 2.0 A, 2W1-2

drive used.

Continued on next page.

Package Dimensions

unit: mm

4186

1

15

46.6

41.2

12.7

25.5

(6.6)

14

×

2.0=28

3.6

0.5

2.0

8.5

4.0

0.4

2.9

1.0

[STK672-080]

STK672-080

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: 2.8 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 input pin 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 1/2 VCC2.

<Driver Block>

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

• Current detection resistor (0.15 Ω) built into the hybrid
IC.

• Power MOSFETs for minimal driver loss

• Motor output drive currents IOHup to 2.8 A (When Tc =
105°C).

No. 6507-2/17

STK672-080

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage1 V

CC

1 max No signal 52 V

Maximum supply voltage2 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 VCC1 applied. 3.3 A
Repeatable avalanche current Ear max 30 mJ
Power loss Pd max

θc-a = 0 8 W
Operating substrate temperature Tc max 105 °C
Junction temperature Tj max 150 °C
Storage temperature Tstg –40 to +125 °C

Specifications

Absolute Maximum Ratings at Tc = 25°C

Parameter Symbol Conditions Ratings Unit

Supply voltage1 V

CC

1 With input signals present 10 to 45 V

Supply voltage2 V

CC

2 With input signals present 5 ±5% V

Input voltage V

IH

0 to VCC2 V

Phase driver voltage handling V

DSS

Tr1, 2, 3, and 4 (the A, A, B, and B outputs) 100 (min) V
Phase current 1 I

OH

1 Tc = 105°C, CLK ≥ 200 Hz 2.8 A

Phase current 2 I

OH

2 Tc = 80°C, CLK ≥ 200 Hz 3 A

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions

Ratings

Unit

min typ max

Control supply current I

CC

Pin 6 input, with ENABLE pin held low. 2.1 14 mA

Output saturation voltage Vsat R

L

= 12 Ω 0.65 1 V
Average output current Io ave Load: R = 3.5 W/L = 3.8 mH per phase 0.445 0.5 0.56 A
FET diode Forward voltage Vdf If = 1 A 1 1.5 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 7 0 2.5 V

Input current I

I

Pin 7, 2.5-V input 330 415 545 µA

[Control Outputs]

Output voltage

V

OH

I = –3 mA, pin MOI 2.4 V

V

OL

I = +3 mA, pin MOI 0.4 V

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

Continued on next page.

Continued from preceding page.

No. 6507-3/17

STK672-080

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 21 %
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.

14

13

15

12

11

10

9

8

6 7 5 4 3 2

+

+

–

–

1

M1

M2

CWB

CLOCK

Excitation mode

control

Excitation state monitor

CR oscillator PWM control

Phase

advance

counter

Current

distribution

ratio switching

Phase excitation drive

signal generation

Reference clock

generation

Pseudo-sine

wave generator

Raising edge/falling edge

detection and switching

M3

RESET

MoI

ENABLE

SUB

PG

BBBABAVref

V

CC

2

A13256

Internal Block Diagram

No. 6507-4/17

STK672-080

Test Circuit Diagrams

No. 6507-5/17

STK672-080

11

8
9

7

13

1

2

3

4

5

A

RL

AB
B

BB

6

+

VCC2

VCC2

STK672-080

Start

Vref=2.5V

V

1

2

3

4

5

A
AB

B
BB

6

VCC1

STK672-080

V

A

A13257

A13258

Vsat Vdf

IIH, I

IL

loave, Icc, fc

To measuring Io ave: With SW1 set to the b position, input Vref and switch SW2.
To measuring fc: With SW1 set to the a position, set Vref to 0 V, and switch SW3.
To measuring Icc: Set the ENABLE pin low.

+

Start

11

8
9

7

13

1

2

3

4

5

A

a

b

a

b

AB

B

SW2

SW3

SW1

BB

6

15

VCC2

Vref

ENABLE

VCC1

VCC1

STK672-080

A13260

8

1

6

A

A

2.5V

VCC2

M1

STK672-080

A13259

9

M2

12

M3

11

CLK

10

CWB

14

13

RESET

15

ENABLE

7

Vref

A

A

fc

I

IL

I

IH

No. 6507-6/17

STK672-080

7

5

A

Two-phase stepping motor

AB

6

14148
14149
141412
15
11
13
10
14

+

+

VCC2=5V

VCC2=5V

SG

100µF or higher

PG

Vref

Ro1

Ro2

VCC2=5V

CLK

ENABLE

CBW

Vf ≈ 0.3V

RESET

MoI

VCC1=10V to 45V

STK672-080

A13261

B
BB

RoX

4
3
2

1

Ioave

IOLI

OH

0A

Motor current waveform

A13262

Simplified power-on reset circuit
(This circuit cannot be used to detect
drops in the power-supply voltage.)

Always perform a power-on reset operation when the V

CC

2 supply voltage is first applied to this hybrid IC.

A value of about 100 Ω is recommended for
R

O

2 to minimize the influence of the Vref
pin internal impedance, which is 6 kΩ.
R

O

X: The input impedance is 6 kΩ ±30%.

Functional 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 7. The following formula gives the relationship
between IOHand Vref.

ROX = (RO2 × 6 kΩ) ÷ (RO2 + 6 kΩ)·············(1)

Vref = VCC2 × ROX ÷ (RO1 + ROX) ··············(2)

1 Vref

IOH= — × ——·············································(3)

k R

S

K: 4.7 (Voltage division ratio), Rs: 0.15 Ω (The hybrid IC’s internal current detection resistor (precision: ±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= 2.8 A

[Function Table]

M2 0 0 1 1
M1

0 1 0 1

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

ENABLE Motor current is cut off when low

RESET Active low