Document
Ordering number : ENA2140
STK672-120-SL-E
Thick-Film Hybrid IC
2-phase Stepping Motor Driver
http://onsemi.com
Overview
The STK672-120-SL-E is a hybrid IC for use as a unipolar, 2-phase stepping motor driver with PWM current control.
Applications
• Office photocopiers, printers, etc.
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
1-2phase 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
O1712HKPC 5-6407 No. A2140-1/11
STK672-120-SL-E
Specifications
Absolute 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 10μA 1 pulse (resistance load)
With an arbitrarily large heat sink. Per MOSFET
Ratings 52
-0.3 to +7.0 -0.3 to +7.0
4 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 Operating supply voltage 1 Operating supply voltage 2 Input high voltage Output current 1 Output current 2
CLOCK frequency Phase driver withstand voltage
Symbol VCC VDD VIH IOH1 IOH2
fCL VDSS
Conditions With signals applied
With signals applied
Pin 8, 9, 10, 11 and 12
Tc=105°C, CLOCK≥200Hz Tc=80°C, CLOCK≥200Hz, See the motor current (IOH) derating curve Minimum pulse width: 20μs ID=1mA (Tc=25°C)
Electrical Characteristics at Tc=25°C, VCC=24V, VDD=5.0V
Parameter
Symbol
Conditions
VDD supply current Output average current
ICCO Ioave
CLOCK=GND
With R/L = 3Ω/3.8mH in each phase Vref = 0.176V
FET diode forward voltage Output saturation voltage High-level input voltage Low-level input voltage Input current
Vref input voltage
Vdf Vsat VIH VIL IIL
VrH
If=1A (RL=23Ω) RL=23Ω Pins 6 to 9 (4 pins)
Pins 6 to 9 (4 pins)
With pins 6 to 9 at the ground level. Pull-up resistance: 40kΩ (typical) Pin 12
Vref input bias current
IIB With pin 12 at 1V
Notes: A fixed-voltage power supply must be used.
min 0.56
4.0 62
0
Ratings 10 to 42 5±5% 0 to VDD 2.4
3.0
0 to 25 100min
unit V V V A
A
kHz V
typ 2.6
0.62 1.1 0.4
125
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
No. A2140-2/11
Package Dimensions
unit:mm (typ)
46.6 41.2
STK672-120-SL-E
8.5
12.7 25.5
18.9
3.6
1 2.0
12 0.5
(9.6) 11 2=22
0.4 7.4 5.2
Figure 1 Derating Curve of Motor Current, IOH, vs. STK672-120-SL-E Operating Substrate Temperature, Tc
Motor current, IOH -- A
IOH -- Tc
4.5
Operating region when fCL≥200Hz
4.0
3.5
VCC=24V Motor: R=0.4Ω
L=1.2mH
3.0
2.5 Operating region in hold mode
2.0
2.4 2.0
1.5
1.0
0.5
0 0 20 40 60 80 100 105 120
Operating substrate temperature, Tc -- °C
Notes • The current range given above represents conditions when output voltage is not in the avalanche state. • Tc must measure surface metal temperature on rear side center of this device.
No. A2140-3/11
Block Diagram
STK672-120-SL-E
VDD 10 MODE 8
CLOCK 9 CWB 7
RESETB 6
Excitation mode selection
Phase advance counter
Off time setting
Vref 12 SP 11
Phase excitation signal generation
Chopping circuit
A AB 54
F1 F2
B BB 32
F3 F4
+ -
VrefA
R1 C1 RsA
R2
+ -
VrefB
C2
RsB
1 GND
SUB
Sample Application Circuit
VDD=5V CLOCK MODE
CWB
5V
RO3 D1
+ CO4 10μF
STK672-120-SL-E
10μF CO3 + 10
9 8 7
5A 4 AB
Two-phase stepping motor
RESETB 5V
6
3B BB
2
RO1
Vref
RO2
0.1μF CO1
12 11
GND 1
VCC 24V
+ CO2 At least 100μF P.GND
No. A2140-4/11
STK672-120-SL-E
Precautions
• To minimize noise in the 5V system, locate the ground side of capacitor CO2 in the above circuit as close as possibleto pin 1 of the IC.
• Insert resistor RO3 (47 to 100Ω) so that the discharge energy from capacitor CO4 is not directly applied to the CMOS-IC in this hybrid device. If the diode D1 has Vf characteristics with .