SANYO STK672-110-E

Ordering number : EN6041A
Thick-Film Hybrid IC
STK672-110-E
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 1.8A
Overview
The STK672-110-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 STK672-110-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 0.22Ω current detection resistor is built in, a
current of 1A is set for each 0.22V 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 1.8A at Tc = 105°C, and of up to 2.65A at Tc = 25°C.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer' s products or
equipment.
61108HKIM/12799RM (OT) No.6041-1/9
STK672-110-E
Specifications
Maximum Ratings at Tc = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage 1
VCC max
No signal
52
V
Maximum supply voltage 2
VDD max
No signal
-0.3 to +7.0
V
Input voltage
VIN max
Logic input pins
-0.3 to +7.0
V
Output current
IOH max
VDD = 5V, CLOCK ≥ 200Hz
2.65
A
Repeated avalanche capacity
Ear max
Allowable power dissipation
Pd max
6.5
W
Operating substrate temperature
Tc max
105
°C
Junction temperature
Tj max
150
°C
Storage temperature
Tstg
-40 to +125
°C
28
With an arbitrarily large heat sink. Per MOSFET
mJ
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage 1
VCC
With signals applied
10 to 42
V
Maximum supply voltage 2
VDD
With signals applied
5.0 ± 5%
V
0 to VDD
V
1.8
A
2.1
A
Input voltage
VIH
Output current 1
IOH1
Output current 2
IOH2
Clock frequency
fCL
Phase driver withstand voltage
VDSS
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)
0 to 25
kHz
100 min
V
Electrical Characteristics at Tc = 25°C, VCC = 24V, VDD = 5V
Parameters
Symbols
Rating
Conditions
min
VDD supply current
ICCO
Output average current
Ioave
typ
CLOCK = GND
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)
With pins 6 to 9 at the ground level.
Input current
IIL
Vref input voltage
VrH
Pin 12
Vref input bias current
IIB
With pin 12 at 1V
Pull-up resistance: 40kΩ (typical)
0.41
unit
max
2.6
6
0.45
0.50
A
1.2
1.8
V
0.73
1.02
V
4.0
62
mA
V
1.0
V
125
250
μA
3.5
V
50
500
nA
0
Note: A fixed-voltage power supply must be used.
Package Dimensions
unit:mm (typ)
4168
32.5
1
2.0
11 2=22
12
0.5
4.0
1.0
26.0
8.5
0.4
2.9
No.6041-2/9
9
7
6
CLOCK
CWB
RESETB
SP 11
Vref 12
8
MODE
VDD 10
Off time
setting
Phase advance
counter
Excitation mode
selection
Chopping circuit
Phase excitation
signal generation
-
+
VrefA
F1
SUB
C1
-
+
R1
4
5
VrefB
RsA
F2
AB
A
C2
R2
RsB
F3
3
B
F4
2
BB
1 GND
STK672-110-E
Internal Equivalent Circuit Block Diagram
ITF02596
No.6041-3/9
STK672-110-E
Sample Application Circuit
STK672-110-E
10μF
VDD=5V
CO3
+
10
CLOCK
9
MODE
8
CWB
7
RESETB
5V
Two-phase stepping motor
5
4
3
6
5V
2
A
AB
VCC
24V
B
BB
+
RO3
RO1
D1
Vref
0.1μF
+
CO4 10μF
RO2
12
1
GND
CO2
At least 100μF
P.GND
11
CO1
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 energy from capacitor CO4 is not directly applied to the CMOS
IC in this hybrid device. If the diode D1 has Vf characteristics with Vf less than or equal to 0.6V (when If = 0.1A),
this will be smaller than the CMOS IC input pin diode Vf. If this is the case RO3 may be replaced with a short
without problem.
• Standard or HC type input levels are used for the pin 7, 8, and 9 inputs.
• If open-collector type circuits are used for the pin 7, 8, and 9 inputs, these circuit will be in the high-impedance state
for high level inputs. As a result, chopping circuit noise may cause the input circuits to operate incorrectly. To prevent
incorrect operation due to such noise, capacitors with values between 470 and 1000pF must be connected between
pins 7 and 11, 8 and 11, and 9 and 11. (A capacitor with a value between 470 and 1000pF must be connected between
pins 6 and 11 as well if an open-collector output IC is used for the RESETB pin (pin 6) input.)
• Taking the input bias current (IIB) characteristics into account, the resistor RO1 must not exceed 100kΩ.
• The following circuit (for a lowered current of over 0.2A) is recommended if the application needs to temporarily
lower the motor current. Here, a value of close to 100kΩ must be used for resistor RO1 to make the transistor output
saturation voltage as low as possible.
5V
5V
RO1
Vref
RO1
RO3
Vref
RO2
RO3
RO2
No.6041-4/9
STK672-110-E
Input Pin Functions (CMOS input levels)
Pin
Pin No.
Function
CLOCK
9
Reference clock for motor phase current switching
MODE
8
Excitation mode selection
Input conditions when operating
Operates on the rising edge of the signal
Low: 2-phase excitation
High: 1-2 phase excitation
CWB
7
Motor direction switching
Low: CW (forward)
RESETB
6
System reset and A, AB, B, and BB outputs cutoff.
High: CCW (reverse)
A reset is applied by a low level
Applications must apply a reset signal for at least 20μs when power is
first applied.
• A simple reset function is formed from D1, CO4, and RO3 in this application circuit. With the CLOCK input held low,
when the 5V supply voltage is brought up a reset is applied if the motor output phases A and BB are driven.
If the 5V supply voltage rise time is slow (over 50ms), the motor output phases A and BB may not be driven. Increase
the value of the capacitor CO4 and check circuit operation again.
• See the timing chart for the concrete details on circuit operation.
Usage Notes
• 5V system input pins
[RESETB and CLOCK (Input signal timing when power is first applied)]
As shown in the timing chart, a RESETB signal input is required by the driver to operate with the timing in which the
F1 gate is turned on first. The RESETB signal timing must be set up to have a width of at least 20μs, as shown below.
The capacitor CO4 and the resistor RO3 in the application circuit form simple reset circuit that uses the RC time
constant rising time. However, when designing the RESETB input based on CMOS levels, the application must have
the timing shown in figure 1.
Rise of the 5V supply voltage
RESETB signal input
At least 20μs
CLOCK signal
At least 10μs
Figure 1 RESETB and CLOCK Signals Input Timing
See the timing chart for details on the CLOCK, MODE, CWB, and other input pins.
[Vref <Motor current peak value setting>]
In the sample application circuit, the peak value of the motor current (IOH) is set by RO1, RO2, and VDD (5V) as
described by the formula below.
IOH
0
Figure 2 Motor Current IO Flowing into the Driver IC
IOH = Vref ÷ Rs Here, Rs is hybrid IC internal current detection resistor
Vref = (R02 ÷ (R01 + R02)) × 5V
STK672-110-E: Rs = 0.22Ω
No.6041-5/9
STK672-110-E
• Allowable motor current operating range
The motor current (IOH) must be held within the range corresponding to the area under the curve shown in figure 4.
For example, if the operating substrate temperature Tc is 105°C, then IOH must be held under IOH = 1.8A, and in
hold mode IOH must be held under IOH = 1.5A.
• Thermal design
[Operating range in which a heat sink is not used]
The STK672-110-E package has a structure that uses no screws, and is recommended for use without a heat sink.
This section discusses the safe operating range when no heat sink is used.
In the maximum ratings specifications, Tc max is specified to be 105°C, and when mounted in an actual end product
system, the Tc max value must never be exceeded during operation. Tc can be expressed by formula (A) below, and
thus the range for ΔTc must be stipulated so that Tc is always under 105°C.
Tc = Ta + ΔTc (A)
Ta: Hybrid IC ambient temperature, ΔTc: Temperature increase across the aluminum substrate
As shown in figure 6, the value of ΔTc increases as the hybrid IC internal average power dissipation PD increases.
As shown in figure 5, PD increases with the motor current. Here we describe the actual PD calculation using the
example shown in the motor current timing chart in figure 3.
Since there are periods when current flows and periods when the current is off during actual motor operation, PD
cannot be determined from the data presented in figure 5. Therefore, we calculate PD assuming that actual motor
operation consists of repetitions of the operation shown in figure 3.
IO1
Motor phase current
(sink side)
IO2
-IO1
T1
T2
T3
T0
Figure 3 Motor Current Timing
T1: Motor rotation operation time
T2: Motor hold operation time
T3: Motor current off time
T2 may be reduced, depending on the application.
T0: Single repeated motor operating cycle
IO1 and IO2: Motor current peak values
Due to the structure of motor windings, the phase current is a positive and negative current with a pulse form.
Note that figure 3 presents the concepts here, and that the on/off duty of the actual signals will differ.
The hybrid IC internal average power dissipation PD can be calculated from the following formula.
PD = (T1 × P1 + T2 × P2 + T3 × 0) ÷ T0
(I)
(Here, P1 is the PD for IO1 and P2 is the PD for IO2)
If the value calculated in formula (I) above is under 1.4W, then from figure 6 we see that operation is allowed up to
an ambient temperature Ta of 60°C.
While the operating range when a heat sink is not used can be determined from formula (I) above, figure 5 is merely a
single example of one operating mode for a single motor.
For example, while figure 5 shows a 2-phase excitation motor, if 1-2 phase excitation is used with a 500Hz clock
frequency, the drive will be turned off for 25% of the time and the dissipation PD will be reduced to 75% of that in
figure 5.
It is extremely difficult for SANYO to calculate the internal average power dissipation PD for all possible end
product conditions. After performing the above rough calculations, always install the hybrid IC in an actual end
product and verify that the substrate temperature Tc does not rise above 105°C.
No.6041-6/9
STK672-110-E
Timing Chart
2-phase excitation
MODE
RESETB
CWB
CLOCK
Gate F1
Gate F2
Gate F3
Gate F4
100%
VrefA
100%
VrefB
ITF02598
1-2 phase excitation
MODE
RESETB
CWB
CLOCK
Gate F1
Gate F2
Gate F3
Gate F4
100%
VrefA
100%
VrefB
ITF02599
No.6041-7/9
STK672-110-E
1-2 phase excitation (CWB)
MODE
RESETB
CWB
CLOCK
Gate F1
Gate F2
Gate F3
Gate F4
100%
VrefA
100%
VrefB
ITF02600
Switching from 2-phase to 1-2 phase excitation
MODE
RESETB
CWB
CLOCK
Gate F1
Gate F2
Gate F3
Gate F4
100%
VrefA
100%
VrefB
ITF02601
No.6041-8/9
IOH - Tc
Figure 4
3.0
Operating region when fCL≥200Hz
Motor current, IOH - A
2.65
2.5
VCC=24V
Motor: R=0.4Ω
L=1.2mH
2.2
2.0
1.8
Operating region in hold mode
1.5
1.5
1.0
0.5
0
0
20
40
60
80
100 105
Operating substrate temperature, Tc - °C
ΔTc - PD
Figure 6
Substrate temperature rise, ΔTc - °C
80
120
ITF02602
Hybrid IC internal average power dissipation, PD - W
STK672-110-E
PD - IOH
Figure 5
12
11
10
9
8
7
VCC=24V, VDD=5.0V
Clock=500Hz
Continuous 2-phase
excitation operation
Motor used: R=0.63Ω
L=0.62mH
The data are typical values.
6
5
4
3
2
1
0
0
0.5
1.0
1.5
2.0
2.5
Motor current, IOH - A
3.0
ITF02603
With no heat sink, the IC vertical,
and convection cooling
70
60
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
2.5
Hybrid IC internal average power disspation, PD - W
3.0
ITF02604
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This catalog provides information as of June, 2008. Specifications and information herein are subject
to change without notice.
PS No.6041-9/9