SANYO STK6712BMK4 Datasheet

Thick Film Hybrid IC

Ordering number : EN4867A

O1895HA (OT)/N0794TH (OT) No. 4867-1/10

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-Type

4-Phase Stepping Motor Driver

STK6712BMK4

Overview

The STK6712BMK4 is a unipolar fixed-current chopper­type 4-phase stepping motor driver hybrid IC (HIC) which
uses a MOSFET power device. The excitation sequence
signal is active low.

Applications

• Serial printer, line printer, and laser beam printer (LBP)
paper feed and carriage motor drivers

• PPC scanner and LBP paper feed drivers

• XY plotter pen drivers

• Industrial robot applications, etc.

Features

• This IC has the features of the STK6712BMK3, plus a
simultaneous input prevention circuit that protects the
IC from any malfunction of the excitation signal.

• Self-excitation design means chopping frequency is
determined by motor L and R. Supports chopping at
20 kHz or higher.

• Very low number of external components required.

• Wide operating supply voltage range (VCC1 = 18 to
42V)

• Excitation sequence signal is active low, and is TTL
level for direct interfacing to the microcomputer and
gate array.

• The unipolar design enables use as a driver for hybrid,
PW, or VR type stepping motors.

• Supports W1-2 phase operation, with a dual Vref pin.

Package Dimensions

unit: mm

4129

[STK6712BMK4]

Specifications

Maximum Ratings at Ta = 25°C

Allowable Operating Ranges at Ta = 25°C

Junction Thermal Resistance

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

Note: With constant voltage power supply.

Internal Equivalent Circuit

No. 4867-2/10

STK6712BMK4

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage 1 V

CC

1 max No input signal 52 V

Maximum supply voltage 2 V

CC

2 max No input signal 7 V

Maximum phase current I

OH

max per phase, R/L = 5 Ω, 10 mH, 0.5 s 1 pulse, VCCinput 2.5 A
Substrate temperature Tc max 105 °C
Junction temperature Tj max 150 °C
Storage temperature Tstg –40 to +125 °C
Repeated avalanche resistance Ear max 38 mJ

Parameter Symbol Conditions Ratings Unit

Supply voltage 1 V

CC

1 With input signal 18 to 42 V

Supply voltage 2 V

CC

2 With input signal 4.75 to 5.25 V

Phase driver voltage resistance V

DSS

(min) 120 V

Phase current I

OH

max Duty 50% (max) 1.7 A

Parameter Symbol Conditions Ratings Unit

Power FET

θj-c 13.5 °C/W

Parameter Symbol Conditions min typ max Unit

Output saturation voltage V

ST

RL = 23 Ω, VIN= 0.8 V 1.1 1.5 V

Output current (average) Io ave R/L = 3.5 Ω/3.8 mH, V

IN

= 0.8 V per phase 0.45 0.50 0.55 A

Pin current dissipation (average) I

CC

2 Load, R = 3.5 Ω, L = 3.8 mH, VIN= 0.8 V per phase 15 25 mA
FET diode voltage Vdf Idf = 1.0 A 1.2 1.8 V
TTL input ON voltage V

IH

Input voltage when F1, 2, 3, 4 ON 2.0 V

TTL input OFF voltage V

IL

Input voltage when F1, 2, 3, 4 OFF 0.8 V

Switching time

t

ON

RL= 24 Ω, VIN= 0.8 V 100 ns

t

OFF

RL= 24 Ω, VIN= 0.8 V 0.2 µs

Sample Application Circuit

Note: For reference, when IOH≈ 1.1 A, RO1 = 6.8 kΩ and RO2 = 390 Ω.

IOH= K × × VCC2/R

7

K ≈ 1.3
R7 = R8 ≈ 0.33 Ω ± 3%

To reduce noise during motor hold, it is possible to mount CO1 ≈ 0.01 µF and CO2 = 100-200 pF. Normally these are
not required.

STK6712BMK4 Circuit Operation

Fig. 1 STK6712BMK4 Internal Equivalent Circuit

RO2

RO1 + RO2

No. 4867-3/10

STK6712BMK4

Output current waveform when phases are held (locked)

Measure output current values in this state.