Document
Ordering number : EN6042A
STK672-120-E
Thick-Film Hybrid IC
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 2.4A
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Overview
The STK672-120-E 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-E 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 inputs are schmitt inputs and 40kΩ (typical: –50 to +100%) pull-up resistors are built in. • The motor current can be set by changing the Vref pin voltage. Since a 0.165Ω current detection resistor is built in, a
current of 1A is set for each 0.165V of applied voltage. • The input frequency range for the clock signal used for motor speed control is 0 to 25kHz. • Supply voltage ranges: VCC = 10 to 42V, VDD = 5.0V ±5% • This IC supports motor operating currents of up to 2.4A at Tc = 105°C, and of up to 4.0A at Tc = 25°C.
Semiconductor Components Industries, LLC, 2013 June, 2013
61108HKIM/12299RM (OT) No.6042-1/9
STK672-120-E
Specifications
Maximum Ratings at Tc = 25°C
Parameter Maximum supply voltage 1 Maximum supply voltage 2 Input voltage Output current Repeated avalanche capacity Allowable power dissipation Operating substrate temperature Junction temperature Storage temperature
Symbol VCC max VDD max VIN max IOH max Ear max Pd max Tc max
Tj max Tstg
Conditions No signal No signal Logic input pins VDD = 5V, CLOCK ≥ 200Hz
With an arbitrarily large heat sink. Per MOSFET
Ratings 52
-0.3 to +7.0 -0.3 to +7.0
4.0 36 8.5 105 150 -40 to +125
Unit V V V A mJ W °C °C °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Allowable Operating Ranges at Ta = 25°C
Parameter Maximum supply voltage 1 Maximum supply voltage 2 Input voltage Output current 1
Symbol
VCC VDD VIH IOH1
Output current 2
Clock frequency Phase driver withstand voltage
IOH2
fCL VDSS
Conditions With signals applied With signals applied
Tc = 105°C, CLOCK ≥ 200Hz Tc = 80°C, CLOCK ≥ 200Hz See the motor curren (IOH) derating curve Minimum pulse width: 20μs ID = 1mA (Tc = 25°C)
Ratings 10 to 42 5.0 ± 5% 0 to VDD 2.4
3.0
0 to 25 100 min
Unit V V V A
A
kHz V
Electrical Characteristics at Tc = 25°C, VCC = 24V, VDD = 5V
Parameters
Symbols
Conditions
VDD supply current
ICCO
CLOCK = GND
Output average current
Ioave
With R/L = 3Ω/3.8mH in each phase Vref = 0.176V
FET diode forward voltage
Vdf If = 1A (RL = 23Ω)
Output saturation voltage
Vsat
RL = 23Ω
High-level input voltage
VIH Pins 6 to 9 (4 pins)
Low-level input voltage
VIL Pins 6 to 9 (4 pins)
Input current
With pins 6 to 9 at the ground level. IIL Pull-up resistance: 40kΩ (typical)
Vref input voltage
VrH Pin 12
Vref input bias current
IIB With pin 12 at 1V
Note: A fixed-voltage power supply must be used.
Package Dimensions
unit:mm (typ)
4167
min 0.56
4.0
Rating typ 2.6
0.62
1.1 0.4
62 125
0 50
max 6
0.69 1.7
0.56
1.0 250 3.5 500
unit
mA A V V V V μA V nA
46.6 41.2 8.5
12.7 25.5
4.0 1.0
3.6
1 12 2.0 0.5
(9.6) 11 2=22
0.4 2.9
No.6042-2/9
STK672-120-E
Internal Equivalent Circuit Block Diagram
ITF02596
No.6042-3/9
VDD 10 MODE 8
CLOCK 9 CWB 7
RESETB 6
Excitation mode selection
Phase advance counter
Off time setting
Phase excitation signal generation
Chopping circuit
Vref 12 SP 11
A 5
F1
AB 4
F2
B 3
F3
BB 2
F4
+ VrefA
-
R1 C1 RsA
R2 RsB
+ VrefB
-
C2
1 GND
SUB
Sample Application Circuit
STK672-120-E
VDD=5V CLOCK MODE
CWB
5V
RO3 D1
+ CO4 10μF
STK672-120-E
10μF CO3 + 10
9
8
7
A 5
AB 4
Two-phase stepping motor
RESETB 5V
6
B 3
BB 2
RO1
Vref
RO2
0.1μF CO1
12 11
GND 1
VCC 24V
+ CO2 At least 100μF P.GND
ITF02597
• To minimize noise in the 5V system, locate the ground side of capacitor CO2 in the above circuit as close as possible to pin 1 of the IC.
• Insert resistor RO3 (47 to 100Ω) so that the discharge e.