Sanyo STK672-120 Specifications

Ordering number : EN6042

12299RM(OT) No. 6042-1/9

Overview

The STK672-120 is a unipolar fixed-current chopper type 2-phase stepping motor driver hybrid IC. It features power MOSFETs in the output stage and a built-in phase signal distribution IC. The incorporation of a phase distribution IC allows the STK672-120 to control the speed of the motor based on the frequency of an external input clock signal. It supports two types of excitation for motor control: 2-phase excitation and 1-2 phase excitation. It also provides a function for switching the motor direction.

Applications

• Two-phase stepping motor drive in send/receive facsimile units

• Paper feed in copiers, industrial robots, and other applications that require 2-phase stepping motor drive

Features

• The motor speed can be controlled by the frequency of an external clock signal (the CLOCK pin signal).

• The excitation type is switched according to the state (low or high) of the MODE pin. The mode is set to 2-phase or 1-2 phase excitation on the rising edge of the clock signal.

• A motor direction switching pin (the CWB pin) is provided.

• All input are Schmitt inputs and 40-kΩ (typical: –50 to

+100%) pull-up resistors are built in.

• The motor current can be set by changing the Vref pin

voltage. Since a 0.165-Ω current detection resistor is built in, a current of 1 A is set for each 0.165 V of applied voltage.

• The input frequency range for the clock signal used for motor speed control is 0 to 25 kHz.

• Supply voltage ranges: VCC1 = 10 to 42 V, VCC2 =

5.0 V ±5%

• This IC supports motor operating currents of up to 2.4 A at Tc = 105°C, and of up to 4.0 A at Tc = 25°C.

Package Dimensions

unit: mm

4167

46.6

41.2

12.7

25.5

(9.6)

2 = 22

3.6

0.5

2.0

8.5

4.0

0.4

2.9

1.0

[STK672-120]

STK672-120

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Unipolar Fixed-Current Chopper (Self-Excited PWM) Scheme and Built-in Phase Signal Distribution IC

Two-Phase Stepping Motor Driver

(Square Wave Drive) Output Current: 2.4 A

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.

No. 6042-2/9

STK672-120

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage 1 V

max No signal 52 V

Maximum supply voltage 2 V

max No signal –0.3 to +7.0 V

Input voltage V

max Logic input pins –0.3 to +7.0 V

Output current I

max VDD= 5 V, CLOCK ≥ 200 Hz 4.0 A Repeated avalanche capacity Ear max 36 mJ Allowable power dissipation Pd max With an arbitrarily large heat sink. Per MOSFET 8.5 W Operating substrate temperature Tc max 105 °C Junction temperature Tj max 150 °C Storage temperature Tstg –40 to +125 °C

Specifications

Maximum Rating at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage 1 V

With signals applied 10 to 42 V

Maximum supply voltage 2 V

With signals applied 5.0 ± 5% V

Input voltage V

0 to V

Phase current 1 I

1 Tc = 105°C, CLOCK ≥ 200 Hz 2.4 A

Phase current 2 I

Tc = 80°C, CLOCK ≥ 200 Hz

3.0 A

See the motor current (I

) derating curve

Clock frequency f

Minimum pulse width: 20 µs 0 to 25 kHz

Phase driver withstand voltage V

DSSID

= 1 mA (Tc = 25°C) 100 min V

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions

Ratings

Unit

min typ max

supply current I

CCO

CLOCK = GND 2.6 6 mA

Output current I

oave

With R/L = 3 Ω/3.8 mH in each phase

0.56 0.62 0.69 A

Vref = 0.176 V

FET diode forward voltage Vdf If = 1 A (R

= 23 Ω) 1.1 1.7 V

Output saturation voltage Vsat R

= 23 Ω 0.40 0.56 V

High-level input voltage V

Pins 6 to 9 (4 pins) 4.0 V

Low-level input voltage V

Pins 6 to 9 (4 pins) 1.0 V

Input current I

With pins 6 to 9 at the ground level.

62 125 250 µA

Pull-up resistance: 40 kΩ (typical) Vref input voltage VrH Pin 12 0 3.5 V Vref input bias current I

With pin 12 at 1 V 50 500 nA

Electrical Characteristics at Ta = 25°C, VCC= 24 V, VDD= 5 V

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

Internal Equivalent Circuit Block Diagram

No. 6042-3/9

STK672-120

Phase excitation signal

generation

Chopping circuit

Off time

setting

Phase advance

counter

Excitation mode

selection

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