Sanyo STK672-020 Specifications

Ordering number : EN4928

D2094TH (OT) 5-3439 No. 4928-1/17

Overview

The STK672-020 is a 4-phase stepping motor driver IC that adopts power MOSFET for its output stage and that uses a unipolar fixed-current chopper scheme. Since the STK672-020 includes a built-in 4-phase distribution controller, the stepping motor driver circuit and the control scheme can be simplified, and the stepping motor driver circuit structure can be standardized. The STK672-020 provides high torque, low vibration, and rapid response based on a W1-2 phase excitation drive scheme. The motor current is voluntary set from externals. Since, compared to the earlier STK6770 Series, the STK672-020 has a smaller package size and reduced drive power dissipation (reduced by 70% over previous products), it provides a wider operating power supply voltage range.

Applications

• Send/receive stepping motors in facsimile equipment

• Stepping motor drive for paper feed and optical systems in copier, and drum drive in laser beam printers

• Pen drive in X-Y plotters

• Industrial robots and other stepping motor application products

Features

• The STK672-020 can easily implement stepping motor drive applications with the provision of a DC power supply and a clock pulse oscillator.

<4-Phase Distribution Controller>

• The STK672-020 supports four excitation types selected by the excitation mode setting (M1 and M2).

1. 4-phase 1 excitation

2. 4-phase 1-2 excitation

3. 4-phase 2 excitation

4. 4-phase W1-2 excitation

• Schmitt input pins (for a high noise margin)

• Controller inputs are CMOS compatible (with built-in pull-up resistors), thus allowing direct control from I/O ports or special-purpose controller LSIs.

• An interval is set up during mutual switching of the AA and BB phase output signals in 4-phase 2 excitation mode.

• Since the STK672-020 is a separate excitation type circuit, it supports a wide operating power supply voltage range. (VCC1 = 5 to 42 V)

• Current detection resistors are provided within the hybrid IC.

• Drive power reduced by 70% when compared to the STK6770 Series (at a 1 A drive).

• Can provide a motor drive current of up to 2.0 A without a heat sink.

Package Dimensions

unit: mm

4150

[STK672-020]

STK672-020

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 (separate excitation)

Type 3.0 A Output Current Stepping Motor Driver

with Built-in 4-Phase Distribution 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.

Specifications

Absolute Maximum Ratings at Ta = 25°C

Allowable Operating Ranges at Ta = 25°C

Electrical Characteristics at Ta = 25°C, VCC1 = 36 V, VCC2 = 5 V

AC Characteristics at Ta = 25°C, VCC1 = 36 V, VCC2 = 5.0 V, CL= 50 pF

Note: Use a rated power supply.

Definition of the Delay Time Tpd

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STK672-020

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage

1 max No signal 52 V

2 max No signal 7.0 V

Maximum phase output current I

max 0.5 s, 1 pulse 3.9 A Repeat avalanche capacity Ear max 42 mJ Input voltage V

max 7.0 V Operating substrate temperature Tc max 105 °C Junction temperature Tj max 150 °C Storage temperature range Tstg –40 to +125 °C

Parameter Symbol Conditions Ratings Unit

Operating supply voltage

1 With a signal present 18 to 42 V

2 With a signal present 5 ± 5% V

Input voltage V

0 to VCC2 V

Phase drive withstand voltage V

DSS

100 V

Phase current I

max Duty: 50% per phase 3.0 A

Parameter Symbol Conditions min typ max Unit

Output saturation voltage Vst R

= 23 Ω 1.5 2.1 V Output current (average) Ioave Load (each phase): R = 3.5 Ω, L = 3.8 mH 0.45 0.50 0.59 A FET diode forward voltage Vdf If = 1.0 A 1.2 1.8 V Current when stopped Icco 36 55 mA On input voltage V

Pins 14, 15, 16, 17, 18, and 19 4.0 V

Off input voltage V

Pins 14, 15, 16, 17, 18, and 19 1.0 V

Input leakage current I

Pins 14, 15, 16, 17, 18, and 19 –600 +30 µA

C1 to C3 high level voltage CV

Pins 1, 2, and 3 2.4 V

C1 to C3 low level voltage CV

Pins 1, 2, and 3 0.4 V

Chopping frequency fc R/C: 2.4 kΩ/6800 pF 35 42 50 kHz

Parameter Symbol Conditions min typ max Unit

Delay time

Tpd1 For the clock path: CLK

→ A, A, B, B 2 µs

Tpd2 For the clock path: CLK → C1, C2, C3 2 µs Output signal interval Tin Only for 4-phase 2 excitation 20 40 µs Maximum clock frequency f

CLK

20 kHz

Definition of the Output Signal Interval Tin

Function Table

Operating Mode

Excitation Mode

Equivalent Circuit

No. 4928-3/17

STK672-020

CW/CCW START/STOP CW L L CCW H L STOP

✕ H

M1 M2 4-phase 1 excitation L L 4-phase 2 excitation H L 4-phase 1-2 excitation L H 4-phase W1-2 excitation H H

Sample Application Circuit (W1-2 phase excitation, motor current: four stage switching)

Note: 1. See the function tables and the timing chart for details on the I/O port signals.

2. Use the Sanyo LB1212, LB1214, or equivalent for the TR array.

3. The RESET pin should normally be left open.

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STK672-020

STK672-020 Operation

Fig. 1 STK672-020 Driver Block Basic Circuit

Figures 1 and 2 show the driver block basic circuit and the waveforms in the various blocks. Unlike the earlier STK6710 Series, which adopted MOSFET transistors, the STK672-020 implements a fixed current drive scheme with separate excitation.

Fig. 2 Waveform Timing Chart

Thus the chopping operation is partially fixed at the oscillator frequency by the latch function. The STK672-020 repeats the operation of switching the motor current on and off, i.e., fixed current chopping operation, as described above.

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When the FET is turned on by a high level input on the øA signal in the driver block basic circuit, the comparator + pin goes low and the comparator output goes low. The L1 current IONthat flows in the FET at this time is given by the following formula.

ION= (1 – e

– t

)..................... (1)

L: Coil inductance R: The sum of the coil resistance and Rs

Then, when the Rs voltage becomes equal to Vref, the FET turns off. At this point the energy stored in the inductor L1 induces a current in L2 and the current I

OFF

flows. The time that the

current I

OFF

flows is proportional to the off time

set at the oscillator.

R L

VCC1 – Vsat

<4-Phase Distribution Control Logic Block Operation>

Fig. 3 Control Logic Circuit

The control logic IC built into the STK672-020 is a special-purpose IC developed to allow stepping motors to be operated more simply than was possible previously.

Features

• One of four excitation types can be selected with the excitation mode setting (M1 and M2).

1. 4-phase 1 excitation

2. 4-phase 1-2 excitation

3. 4-phase 2 excitation

4. 4-phase W1-2 excitation

• Schmitt circuits are provided on all input pins (for a high noise margin).

• Inputs have 10 kΩ pull-up resistors built in so that they are CMOS and TTL input compatible. Thus the inputs can be

driven directly from I/O ports or special-purpose LSIs.

• The AA and BB phases of 4-phase control output at the 2-phase excitation set up the interval times.

• The minimum pulse width for the control logic is 25 µs. The logic operates on pulse falling edges.

The following timing charts show the logic in each excitation mode.

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