STK672-630C-E [SANYO]
Thick-Film Hybrid IC 2-phase Stepping Motor Driver; 厚膜混合集成电路二相步进电机驱动器
| 型号： | STK672-630C-E |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Thick-Film Hybrid IC 2-phase Stepping Motor Driver |
| 文件： | 总26页 (文件大小：246K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : ENA2115
Thick-Film Hybrid IC
STK672-630C-E
2-phase Stepping Motor Driver
Overview
The STK672-630C-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
• Built-in opened motor pin detection function (output current OFF).
• Built-in overcurrent detection function (output current OFF).
• Built-in overheat detection function (output current OFF).
• If opened motor pin, over-current, or overheat detection function is activated, the FAULT1 signal (active low) is
output. The FAULT2 signal is used to output the result of activation of protection circuit detection at 3 levels.
• Built-in power on reset function.
• The motor speed is controlled by the frequency of an external clock signal.
• 2 phase or 1-2 phase excitation switching function.
• Using either or both edges of the clock signal switching function.
• Phase is maintained even when the excitation mode is switched.
• Rotational direction switching function.
• Supports schmitt input for 2.5V high level input.
• Incorporating a current detection resistor (0.141Ω: resistor tolerance 2%), motor current can be set using two
external resistors.
• The ENABLE pin can be used to cut output current while maintaining the excitation mode.
• With a wide current setting range, power consumption can be reduced during standby.
• No motor sound is generated during hold mode due to external excitation current control.
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. 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 new introduction or other application different
from current conditions on the usage of automotive device, communication device, office equipment, industrial
equipment etc. , please consult with us about usage condition (temperature, operation time etc.) 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.
82912HKPC 018-11-0049 No. A2115-1/26
STK672-630C-E
Specifications
Absolute Maximum Ratings at Tc = 25°C
Parameter
Maximum supply voltage 1
Maximum supply voltage 2
Input voltage
Symbol
max
Conditions
Ratings
unit
V
V
V
V
No signal
50
CC
max
No signal
-0.3 to +6.0
-0.3 to +6.0
10
V
DD
max
max
max
max
Logic input pins
V
IN
OP
OH
OF
Output current 1
I
I
I
10μA, 1 pulse (resistance load)
A
Output current 2
V
=5V, CLOCK≥200Hz
2.65
A
DD
Output current 3
Pin16 output current
10
mA
W
W
°C
°C
°C
Allowable power dissipation 1
Allowable power dissipation 2
Operating substrate temperature
Junction temperature
Storage temperature
PdMF max
PdPK max
Tc
With an arbitrarily large heat sink. Per MOSFET
No heat sink
7.3
3.1
-20 to +105
150
Tj max
Tstg
-40 to +125
Allowable Operating Ranges at Ta=25°C
Parameter
Operating supply voltage 1
Operating supply voltage 2
Input high voltage
Symbol
Conditions
Ratings
unit
V
V
V
V
V
With signals applied
With signals applied
0 to 46
5 5%
CC
V
DD
IH
IL
Pins 10, 12, 13, 14, 15, 17 V =5 5%
DD
2.5 to V
V
DD
Input low voltage
Pins 10, 12, 13, 14, 15, 17 V =5 5%
DD
0 to 0.8
V
Output current 1
I
1
Tc=105°C, CLOCK≥200Hz,
OH
2.0
2.2
A
A
Continuous operation, duty=100%
Tc=80°C, CLOCK≥200Hz,
Output current 2
I
2
OH
Continuous operation, duty=100%,
See the motor current (I
) derating curve
OH
CLOCK frequency
f
Minimum pulse width: at least 10μs
Tc=105°C
0 to 50
kHz
V
CL
Recommended Vref range
Vref
0.14 to 1.38
Electrical Characteristics at Tc=25°C, V =24V, V =5.0V
CC
DD
Parameter
Symbol
Conditions
min
typ
max
unit
mA
A
V
supply current
I
Pin 9 current CLOCK=GND
5
8
DD
CCO
Output average current*
FET diode forward voltage
Output saturation voltage
Input high voltage
Ioave
Vdf
R/L=1Ω/0.62mH in each phase
0.32
0.38
0.92
0.33
0.45
1.6
If=1A (R =23Ω)
V
L
Vsat
R =23Ω
0.48
V
L
V
Pins 10, 12, 13, 14, 15, 17
Pins 10, 12, 13, 14, 15, 17
2.5
V
IH
Input low voltage
V
0.8
0.5
10
V
IL
FAULT1 low output voltage
5V level FAULT leakage current
V
Pin 16 (I =5mA)
O
0.25
V
OLF
I
Pin 16=5V
μA
ILF
FAULT2 opened motor pin
detection output voltage
FAULT2 Overcurrent detection
output voltage
V
V
V
1
2
3
OF
OF
OF
0.00
2.4
0.01
2.5
0.20
2.6
Pin 8 (when all protection functions have
been activated)
V
FAULT2 Overheat detection
output voltage
3.1
3.3
50
3.5
5V level input current
I
I
I
Pins 10, 12, 13, 14, 15, 17=5V
Pins 10, 12, 13, 14, 15, 17=GND
Pin 19=1.0V
75
10
1
μA
μA
μA
kHz
°C
ILH
ILL
IB
GND level input current
Vref input bias current
PWM frequency
fc
29
45
61
Overheat detection temperature
Drain-to-Source leakage current
TSD
Design guarantee
144
I
V
=100V,
1
μA
DSS
DS
Pins 2, 6, 9, and 18=GND
* Maximum value of operating supply voltage 1 (V ) can not supply to STK672-630C-E, depending on motor current
CC
value. Refer to “8. Precautions, etc” of Usage Notes.
*Ioave values are for when the lead frame of the product is soldered to the mounting substrate.
Notes: A fixed-voltage power supply must be used.
No. A2115-2/26
STK672-630C-E
Package Dimensions
unit:mm (typ)
29.2
25.6
(20.47)
4.5
2.0
(R1.7)
1
19
4.2
1.0
0.52
0.4
(5.6)
8.2
18 1.0=18.0
(20.4)
Derating curve of motor current, I
vs. STK672-630C-E Operating substrate temperature, Tc
OH,
I
- Tc
OH
3.0
200Hz 2-phase excitation
2.5
2.0
1.5
1.0
Hold mode
0.5
0
0
10
20
30
40
50
60
70
80
90 100 110
Operating Substrate Temperature, Tc- °C
ITF02548
Notes
• The current range given above represents conditions when output voltage is not in the avalanche state.
• If the output voltage is in the avalanche state, see the allowable avalanche energy for STK672-6** series hybrid ICs given
in a separate document.
• The operating substrate temperature, Tc, given above is measured while the motor is operating.
• Because Tc varies depending on the ambient temperature, Ta, the value of I , and the continuous or intermittent
OH
operation of I , always verify this value using an actual set.
OH
• The Tc temperature should be checked in the center of the metal surface of the product package.
No. A2115-3/26
STK672-630C-E
Block Diagram
FAULT2 VrefOP
A
4
AB
5
B
3
BB
1
8
7
V
=5V
9
DD
V
DD
F1
F2
F3
F4
MODE1 10
N.C 11
Excitation mode
selection
FAO
Phase
excitation
signal
FAB
FBO
FBB
MODE2 17
CLOCK 12
CWB 13
Phase
advance
counter
generator
Output
open
detection
Latch
Circuit
R1
R2
Power-on
reset
RESETB 14
ENABLE 15
Latch
Circuit
Overcurrent
detection
2
6
P.G2
P.G1
AI
BI
Current control
chopper circuit
FAULT1 16
FAULT1
FAULT2
signal
Vref/4.9
Latch
Circuit
Overheating
detection
Vref
Amplifier
V
SS
V
SS
N.C 18
Vref 19
Sample Application Circuit
STK672-630C-E
V
(5V)
DD
9
2 phase stepping motor driver
12
10
17
CLOCK
MODE1
MODE2
CWB
A
4
5
V
CC
24V
AB
13
15
ENABLE
B
3
1
RESETB
R03
BB
14
R01
R02
+
C01
at least 100μF
16
8
P.G2
P.G1
FAULT1
FAULT2
2
6
P.GND
Vref
19
18
0.1μF
N.C
C02
No. A2115-4/26
STK672-630C-E
Precautions
[GND wiring]
• To reduce noise on the 5V system, be sure to place the GND of C01 in the circuit given above as close as possible to
Pin 2 and Pin 6 of the hybrid IC. Also, to achieve accurate current settings, be sure to connect Vref GND to the point
where P.G1 and P.G2 share a connection.
[Input pins]
• If V
is being applied, use care that each input pin does not apply a negative voltage less than -0.3V to PG and DO
DD
not apply a voltage greater than or equal to V
voltage.
DD
• Do not wire by connecting the circuit pattern on the P.C.B side to N.C Pins. shown in the internal block diagram.
• Apply 2.5V high level input to pins 10, 12, 13, 14, 15, and 17.
• Since the input pins do not have built-in pull-up resistors, when the open-collector type pins 10, 12, 13, 14, 15, and 17
are used as inputs, a 1 to 20kΩ pull-up resistor (to V ) must be used.
DD
At this time, use a device for the open collector driver that has output current specifications that pull the voltage down
to less than 0.8V at Low level (less than 0.8V at Low level when I =5mA).
OL
[Current setting Vref]
If the motor current is temporarily reduced, the circuit given below (STK672-632C-E, 630C-E : I >0.2A
OH
STK672-642C-E, 640C-E : I >0.3A) is recommended.
OH
5V
5V
R01
Vref
R01
Vref
R02
R3
R3
R02
• Motor current peak value I
setting
OH
I
OH
0
I
=(Vref÷4.9) ÷Rs
OH
The value of 4.9 in Equation above represents the Vref voltage as divided by a circuit inside the control IC.
Vref=(R02÷ (R01+R02)) ×5V(or 3.3V)
Rs is an internal current detection resistor value of the hybrid IC.
Rs=0.141Ω when using the STK672-630C-E
Rs=0.089Ω when using the STK672-642C-E, -640C-E
No. A2115-5/26
STK672-630C-E
Input Pin Functions
Pin Name
CLOCK
Pin No.
12
Function
Reference clock for motor phase current switching
Excitation mode selection
Input Conditions When Operating
Operates on the rising edge of the signal (MODE2=H)
MODE1
MODE2
CWB
10
Low: 2-phase excitation
High: 1-2 phase excitation
High: Rising edge
17
13
14
Low: Rising and falling edge
Low: CW (forward)
Motor direction switching
High: CCW (reverse)
RESETB
System reset
A reset is applied by a low level
Initial state of A and BB phase excitation in the timing
charts is set by switching from low to high.
The A, AB, B, and BB outputs are turned off, and after
operation is restored by returning the ENABLE pin to the
high level, operation continues with the same excitation
timing as before the low-level input.
ENABLE
15
The A, AB, B, and BB outputs are turned off by a low-
level input.
Output Pin Functions
Pin Name
FAULT1
Pin No.
16
Function
Input Conditions When Operating
Low level is output when detected.
Monitor pin used when opened motor pin, over-current
detection, or overheat detection function is activated.
The result of activation of protection circuit detection is
output.
FAULT2
VrefOP
8
7
3 levels output voltage
Monitor pin of reference voltage used when opened motor
pin detection.
Normal DC voltage output (typ98mV)
Note: See the timing chart for the concrete details on circuit operation.
No. A2115-6/26
STK672-630C-E
Timing Charts
2-phase excitation
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
FAB
FBO
FBB
1-2 phase excitation
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
FAB
FBO
FBB
No. A2115-7/26
STK672-630C-E
1-2 phase excitation (CWB)
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
FAB
FBO
FBB
2 phase excitation → Switch to 1-2 phase excitation
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
FAB
FBO
FBB
No. A2115-8/26
STK672-630C-E
1-2 phase excitation (ENABLE)
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
FAB
FBO
FBB
1-2 phase excitation (Hold operation results during fixed CLOCK)
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
Hold operation
FAB
FBO
FBB
No. A2115-9/26
STK672-630C-E
2 phase excitation (MODE 2)
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
FAB
FBO
FBB
1-2 phase excitation (MODE 2)
V
DD
Power On Reset
(or RESETB)
MODE1
MODE2
CWB
CLOCK
ENABLE
FAO
FAB
FBO
FBB
No. A2115-10/26
STK672-630C-E
Usage Notes
1. Input signal functions and timing
[ENABLE, CLOCK and power on reset, RESETB (Input signal timing when power is first applied)]
The control IC of the driver is equipped with a power on reset function capable of initializing internal IC operations
when power is supplied. A 4V typ setting is used for power on reset. Because the specification for the MOSFET gate
voltage is 5V 5%, conduction of current to output at the time of power on reset adds electromotive stress to the
MOSFET due to lack of gate voltage. To prevent electromotive stress, be sure to set ENABLE=Low while V , which
DD
is outside the operating supply voltage, is less than 4.75V.
In addition, if the RESETB terminal is used to initialize output timing, be sure to allow at least 10μs until CLOCK
input.
3.8V typ
4V typ
Control IC power (V ) rising edge
DD
Control IC power on reset
RESETB signal input
ENABLE signal input
CLOCK signal input
No time specification
At least 10μs
At least 10μs
ENABLE, CLOCK, and RESETB Signals Input Timing
[CLOCK (Phase switching clock)]
• Input frequency: DC to 50kHz
• Minimum pulse width: 10μs
• MODE2=1(High) Signals are read on the rising edge.
• MODE2=0(Low) Signals are read on the rising and falling edges.
[CWB (Motor direction setting)]
The direction of rotation is switched by setting CWB to 1 (high) or 0 (low).
See the timing charts for details on the operation of the outputs.
Note: The state of the CWB input must not be changed during the 6.25μs period before and after the rising edge of the
CLOCK input.
[ENABLE (Forcible on/off control of the A, AB, B, and BB outputs, and hybrid IC internal operation)]
ENABLE=1: Normal operation
ENABLE=0: Outputs A, AB, B, and BB forced to the off state.
If, during the state where CLOCK signal input is provided, the ENABLE pin is set to 0 and then is later
restored to the 1 state, the IC will resume operation with the excitation timing continued from before the
point ENABLE was set to 0.
If sudden stop is applied to the CLOCK signal used for motor rotation, the motor axis may advance beyond the
theoretical position due to inertia. To stop at the theoretical position, the SLOW DOWN setting for gradually slowing
the CLOCK cycle is required.
No. A2115-11/26
STK672-630C-E
[MODE1 and MODE2 (Excitation mode selection)]
MODE1=0: 2-phase excitation
MODE2=1: Rising edge of CLOCK
MODE1=1: 1-2 phase excitation
MODE2=0: Rising and falling edges of CLOCK
See the timing charts for details on output operation in these modes.
Note: The state of the MODE input must not be changed during the 5μs period before and after the rising edge of the
CLOCK input.
The CLOCK input must not be changed during the period from when the signal changes from high to low or low
to high in MODE1 or MODE2, till when the signal changes from high to low or low to high in CWB.
[Configuration of Each Input Pin]
<Configuration of the MODE1, MODE2, CLOCK,
CWB, ENABLE, and RESETB input pins>
<Configuration of the FAULT2 pin>
5V
5V
Output pin
Pin 8
50kΩ
10kΩ
Opened motor pin
50kΩ
Overcurrent
Input pin
50kΩ
100kΩ
V
Thermal shutdown
SS
(Configuration of the buffer is open drain.)
All input pins of this driver support schmitt input. Typ specifications at Tc = 25°C are given below. Hysteresis voltage
is 0.3V (VIHa-VILa).
When rising
When falling
1.8V typ
1.5V typ
Input voltage
VILa
VIHa
Input voltage specifications are as follows.
V
V
=2.5V min
IH
=0.8V max
IL
<Configuration of the Vref input pin>
<Configuration of the FAULT1 output pin>
5V
Output pin
Pin 16
Vref/4.9
−
Opened motor pin
Overcurrent
Thermal shutdown
+
Amplifier
Input pin
Pin 19
V
V
SS
SS
No. A2115-12/26
STK672-630C-E
<FAULT1, FAULT2 output>
FAULT1 Output
FAULT1 is an open drain output. Low is output if either overcurrent or overheating is detected.
FAULT2 output
Output is resistance divided (3 levels) and the type of abnormality detected is converted to the corresponding output
voltage.
• Opened motor pin: 10mV (typ)
• Overcurrent: 2.5V (typ)
• Overheat: 3.3V (typ)
Abnormality detection can be released by a RESETB operation or turning V
voltage on/off.
DD
<VrefOP output pin configuration>
5V
1.3V
180kΩ
17kΩ
Output pin
Pin 7
-
To opened motor pin
detection circuit
1kΩ
+
V
SS
<VrefOP output>
To set the motor current detection circuit operates when pin is open, to monitor the reference voltage VrefOP
terminal. It is also possible to set any detectable current by connecting an external pull-up resistor to 5V supply.
<I d by setting pull-up resistor current sensing pin 7 open>
OH
When 7 pins open, VrefOP (typ) is 98mV. In this case, detection current I d is expressed as follows.
OH
VefOP = I d × Rs (Rs: Current detection resistor)
OH
Detection current is 1.1A.
Now, detection current greater than 1.1A is I dX. Reference voltage VrefOPX is calculated as above.
OH
Pull-up resistor Rdx by pin 7 is calculated as follows.
RdX = (180 × RTX) ÷ (180 - RTX)
RTX = (5.0V - VrefOPX) ÷ ((1.0588 × VrefOPX) - 0.0765) (RdX and RTX unit is kΩ)
*To disable pin open detection, please connect a 5V pull-up resistor of 10k to 15kΩ.
No. A2115-13/26
STK672-630C-E
2. STK672-630C-E overcurrent detection, overheat detection, and motor terminal open detection functions
Each detection function operates using a latch system and turns output off. Because a RESET signal is required to
restore output operations, once the power supply, V , is turned off, you must either again apply power on reset with
DD
V
ON or apply a RESETB=High→Low→High signal.
DD
[Motor terminal open detection]
This hybrid IC is equipped with a function for detecting open output terminals to prevent thermal destruction of the
MOSFET due to repeated avalanche operation that occurs when an output terminal connected to the motor is open.
The open condition is determined by checking the presence or absence of the flyback current that flows in the motor
inductance during the off period of the PWM cycle.
Detection is performed by using the fact that the flyback current does not flow when a motor terminal is open.
Terminal open
Used to see the motor current
Current detection
resistor voltage
0V (GND potential)
Used for open detection
(Negative current does not flow
when the terminal is open.)
MOSFET gate signal
PWM period
When the current level drops, the difference with the GND potential decreases, making detection difficult. The motor
current that can be detected by motor terminal open detection is 0.7A or more with the STK672-630C-E.
<Notes on the ENABLE high edge>
When ENABLE changes from low to high and the STK672-6XXB-E performs constant-current PWM operation that
flows a negative current during the 30μs period after the high edge, open detection may activate and stop the driver.
The motor current setting voltage Vref must be set so that PWM operation is not performed within a period of 30μs
after the high edge.
If the motor current setup voltage is set for the rated motor current, PWM operation is not performed during this 30μs
period after the high edge, so this is not a problem.
In addition, there is no problem with operation that lowers the current setting Vref after the motor rated current is
reached as shown in the diagram on the following page.
Whether constant-current PWM operation is performed during the 30μs period after the high edge can be judged by
substituting the motor L and R values into the formula on the following page.
Vref= (R02 ÷ (R01+R02)) × 5V (or 3.3V)
I
I
1= (Vref ÷ 4.9) ÷ Rs
I
I
1: Motor current value to be set
2: Current value 30μs after the ENABLE high edge
OH
OH
OH
OH
2= (V
÷ R) × (1-e-tR/L
)
CC
⇒ Judgment standard: I 1>I
OH OH
2
R01, R02, 5V (or 3.3V): See the Sample Application Circuit documents.
Rs: Current detection resistance value (Ω)
V
: Motor supply voltage (V)
CC
R: Motor winding resistance (Ω)
L: Motor winding inductance (H)
⇒ There is no problem if the I 2 obtained by substituting t = 30μs and the motor L and R values is smaller than
OH
the current setting value I 1.
OH
No. A2115-14/26
STK672-630C-E
ENABLE
Vref
Output current
Constant-current PWM operation must not be performed for 30 µs or less.
<Connection of capacitors between output pins and GND prohibited>
Capacitors must not be connected between the phase A (pin 4), phase AB (pin 5), phase B (pin 3) and phase BB
(pin 1) outputs and GND. What happens if capacitors are connected is that open-circuit detection may be triggered
by the discharge current of the capacitors when the internal MOSFET is set ON. This current is not an inductance
current generated by the motor winding but a capacitor current so a negative current will not flow to the other phase
in each pair of phases, possibly causing the driver to shut down.
<Excessive external noise>
If, when the motor current rises prior to the PWM operation, a spike-shaped current exceeding the Vref-setting
current is generated by excessive external noise, for instance, before the current level (0.7A for the STK672-632C-E
and 630C-E, 1.1A for the STK672-642C-E and 640C-E motor drivers) at which motor pin open-circuiting can be
detected is reached, the internal MOSFET is set OFF. Since the MOSFET has been set OFF before the actual motor
current reaches 0.5A (or 0.8A), the level of the negative current subsequently flowing to the other phase in each pair
of phases is low, and it may be judged that no negative current is flowing, possibly causing open-circuit detection to
be triggered.
During normal constant-current PWM operation, the duration of 5.5μs, which is equivalent to 25% of the initial
operation in the PWM period, corresponds to the section where the current is not detected, and this ensures that no
current is detected for the linking part of the current that is generated in this section. The no-current detection
section is not synchronized at the current rise prior to the PWM operation so when a spike-shaped current exceeding
the Vref-setting current is generated, the MOSFET is set OFF at the stage where the level of the actual motor
current is low. As a result, the level of the negative current subsequently flowing to the other phase in each pair of
phases is low, and it may be judged that no negative current is flowing, possibly causing open-circuit detection to be
triggered.
Spike-shaped current
Vref setting
current (I
)
OH
Motor
current
Current level at
which open-
circuiting is
detected
No-current detection time (5.5μs typ)
PWM period
No. A2115-15/26
STK672-630C-E
[Over current detection]
This hybrid IC is equipped with a function for detecting overcurrent that arises when the motor burns out or when there
is a short between the motor terminals.
Over current detection occurs at 3.5A typ with the STK672-630C-E. and -632C-E.
Current when motor terminals are shorted
PWM period
Over current detection
max
Set motor
current,
I
OH
I
OH
MOSFET all OFF
5.5μs typ
No detection interval
(5.5μs typ)
Normal operation
Operation when motor pins are shorted
Over current detection begins after an interval of no detection (a dead time of 5.5μs typ) during the initial ringing part
during PWM operations. The no detection interval is a period of time where over current is not detected even if the
current exceeds I
.
OH
[Overheat detection]
Rather than directly detecting the temperature of the semiconductor device, overheat detection detects the temperature
of the aluminum substrate (144°C typ).
Within the allowed operating range recommended in the specification manual, if a heat sink attached for the purpose
of reducing the operating substrate temperature, Tc, comes loose, the semiconductor can operate without breaking.
However, we cannot guarantee operations without breaking in the case of operations other than those recommended,
such as operations at a current exceeding I
max that occurs before over current detection is activated.
OH
No. A2115-16/26
STK672-630C-E
3. Calculating STK672-630C-E HIC Internal Power Loss
The average internal power loss in each excitation mode of the STK672-630C-E can be calculated from the following
formulas.
Each excitation mode
2-phase excitation mode
2PdAVex=2×Vsat×0.5×CLOCK×I ×t2+0.5×CLOCK×I × (Vsat×t1+Vdf×t3)
OH OH
1-2 Phase excitation mode
1-2PdAVex=2×Vsat×0.25×CLOCK×I ×t2+0.25×CLOCK×I × (Vsat×t1+Vdf×t3)
OH OH
Motor hold mode
HoldPdAVex= (Vsat+Vdf)×I
OH
Vsat: Combined voltage of Ron voltage drop + current detection resistance
Vdf: Combined voltage of the FET body diode + current detection resistance
CLOCK: Input CLOCK (CLOCK pin signal frequency)
t1, t2, and t3 represent the waveforms shown in the figure below.
t1: Time required for the winding current to reach the set current (I
t2: Time in the constant current control (PWM) region
)
OH
t3: Time from end of phase input signal until inverse current regeneration is complete
I
OH
0A
t1
t2
t3
Motor COM Current Waveform Model
t1= (-L/(R+0.33)) ln (1-((R+0.33)/V ) ×I
CC OH
)
t3= (-L/R) ln ((V +0.33)/(I ×R+V +0.33))
CC OH CC
: Motor supply voltage (V)
CC
L: Motor inductance (H)
V
R: Motor winding resistance (Ω)
I
: Motor set output current crest value (A)
OH
Relationship of CLOCK, t1, t2, and t3 in each excitation mode
2-phase excitation mode: t2= (2/CLOCK) - (t1+t3)
1-2 phase excitation mode: t2= (3/CLOCK) -t1
For Vsat and Vdf, be sure to substitute values from the graphs of Vsat vs. I
and Vdf vs. I
while the set current
OH
OH
value is I
.
OH
Then, determine whether a heat sink is required by comparing with the graph of ΔTc vs. Pd based on the average HIC
power loss calculated.
When designing a heat sink, refer to the section “Thermal design” found on the next page. The average HIC power
loss, PdAV, described above does not have the avalanche’s loss. To include the avalanche’s loss, be sure to add
Equation (2), “STK672-6** Allowable Avalanche Energy Value” to PdAV above. When using this IC without a fin
always check for temperature increases in the set, because the HIC substrate temperature, Tc, varies due to effects of
convection around the HIC.
No. A2115-17/26
STK672-630C-E
STK672-630C-E Output saturation voltage, Vsat - Output current, I
OH
Vsat - I
OH
1.0
0.8
0.6
0.4
0.2
0
0
0.5
1.0
1.5
2.0
2.5
3.0
Output current, I
OH
- A
ITF02571
STK672-630C-E Forward voltage, Vdf -Output current, I
OH
Vdf- I
OH
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.5
1.0
1.5
2.0
2.5
3.0
Output current, I
OH
- A
ITF02572
Substrate temperature rise, ΔTc (no heat sink) - Internal average power dissipation, PdAV
ΔTc - PdAV
80
70
60
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Hybrid IC internal average power dissipation, PdAV - W
ITF02551
No. A2115-18/26
STK672-630C-E
4. STK672-630C-E Allowable Avalanche Energy Value
(1) Allowable Range in Avalanche Mode
When driving a 2-phase stepping motor with constant current chopping using an STK672-6** Series hybrid IC,
the waveforms shown in Figure 1 below result for the output current, I , and voltage, V
.
DS
D
V
: Voltage during avalanche operations
DSS
V
DS
I
: Motor current peak value
OH
IAVL: Current during avalanche operations
I
D
tAVL: Time of avalanche operations
ITF02557
Figure 1 Output Current, I , and Voltage, V , Waveforms 1 of the STK672-6** Series when
DS
D
Driving a 2-Phase Stepping Motor with Constant Current Chopping
When operations of the MOSFET built into STK672-6** Series ICs is turned off for constant current chopping,
the I signal falls like the waveform shown in the figure above. At this time, the output voltage, V , suddenly
D
DS
rises due to electromagnetic induction generated by the motor coil.
In the case of voltage that rises suddenly, voltage is restricted by the MOSFET V
. Voltage restriction by
DSS
V
results in a MOSFET avalanche. During avalanche operations, I flows and the instantaneous energy at
D
DSS
this time, EAVL1, is represented by Equation (1).
EAVL1=V
V
×IAVL×0.5×tAVL ------------------------------------------- (1)
DSS
: V units, IAVL: A units, tAVL: sec units
DSS
The coefficient 0.5 in Equation (1) is a constant required to convert the IAVL triangle wave to a
square wave.
During STK672-6** Series operations, the waveforms in the figure above repeat due to the constant current
chopping operation. The allowable avalanche energy, EAVL, is therefore represented by Equation (2) used to find
the average power loss, PAVL, during avalanche mode multiplied by the chopping frequency in Equation (1).
PAVL=V
×IAVL×0.5×tAVL×fc ------------------------------------------- (2)
fc: Hz units (fc is set to the PWM frequency of 50kHz.)
DSS
For V
DSS
, IAVL, and tAVL, be sure to actually operate the STK672-6** Series and substitute values when
operations are observed using an oscilloscope.
Ex. If V =110V, IAVL=1A, tAVL=0.2μs when using a STK672-630C-E driver, the result is:
DSS
PAVL=110×0.5×0.5×0.2×10-6×50×103=0.28W
=110V is a value actually measured using an oscilloscope.
V
DSS
The allowable loss range for the allowable avalanche energy value, PAVL, is shown in the graph in Figure 3.
When examining the avalanche energy, be sure to actually drive a motor and observe the I , V , and tAVL
D
DSS
waveforms during operation, and then check that the result of calculating Equation (2) falls within the allowable
range for avalanche operations.
No. A2115-19/26
STK672-630C-E
(2) I
V
Operating Waveforms in Non-avalanche Mode
D and DSS
Although the waveforms during avalanche mode are given in Figure 1, sometimes an avalanche does not result during
actual operations.
Factors causing avalanche are listed below.
• Poor coupling of the motor’s phase coils (electromagnetic coupling of A phase and AB phase, B phase and
BB phase).
• Increase in the lead inductance of the harness caused by the circuit pattern of the P.C. board and motor.
• Increases in V
, tAVL, and IAVL in Figure 1 due to an increase in the supply voltage from 24V to 36V.
DSS
If the factors above are negligible, the waveforms shown in Figure 1 become waveforms without avalanche as
shown in Figure 2.
Under operations shown in Figure 2, avalanche does not occur and there is no need to consider the allowable loss
range of PAVL shown in Figure 3.
V
DS
I
: Motor current peak value
OH
I
D
ITF02558
Figure 2 Output Current, I , and Voltage, V , Waveforms 2 of the STK672-6** Series when Driving a
DS
D
2-Phase Stepping Motor with Constant Current Chopping
Figure 3 Allowable Loss Range, PAVL-I
OH
During STK672-630C-E Avalanche Operations
PAVL - I
OH
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
0.5
1.0
1.5
2.0
2.5
Motor phase current, I
OH
- A
ITF02573
Note:
The operating conditions given above represent a loss when driving a 2-phase stepping motor with constant current
chopping.
Because it is possible to apply 2.6W or more at I =0A, be sure to avoid using the MOSFET body diode that is used
OH
to drive the motor as a zener diode.
No. A2115-20/26
STK672-630C-E
5. Thermal design
[Operating range in which a heat sink is not used]
Use of a heat sink to lower the operating substrate temperature of the HIC (Hybrid IC) is effective in increasing the
quality of the HIC.
The size of heat sink for the HIC varies depending on the magnitude of the average power loss, PdAV, within the HIC.
The value of PdAV increases as the output current increases. To calculate PdAV, refer to “Calculating Internal HIC
Loss for the STK672-630C-E in the specification document.
Calculate the internal HIC loss, PdAV, assuming repeat operation such as shown in Figure 1 below, since conduction
during motor rotation and off time both exist during actual motor operations,
I 1
O
Motor phase current
(sink side)
I 2
O
0A
-I 1
O
T1
T3
T2
T0
Figure 1 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
I 1 and I 2: Motor current peak values
O
O
Due to the structure of motor windings, the phase current is a positive and negative current with a pulse form.
Note that figure 1 presents the concepts here, and that the on/off duty of the actual signals will differ.
The hybrid IC internal average power dissipation PdAV can be calculated from the following formula.
PdAV= (T1×P1+T2×P2+T3×0) ÷TO ---------------------------- (I)
(Here, P1 is the PdAV for I 1 and P2 is the PdAV for I 2)
O
O
If the value calculated using Equation (I) is 1.5W or less, and the ambient temperature, Ta, is 60°C or less, there is no
need to attach a heat sink. Refer to Figure 2 for operating substrate temperature data when no heat sink is used.
[Operating range in which a heat sink is used]
Although a heat sink is attached to lower Tc if PdAV increases, the resulting size can be found using the value of
θc-a in Equation (II) below and the graph depicted in Figure 3.
θc-a= (Tc max-Ta) ÷PdAV ---------------------------- (II)
Tc max: Maximum operating substrate temperature =105°C
Ta: HIC ambient temperature
Although a heat sink can be designed based on equations (I) and (II) above, be sure to mount the HIC in a set and
confirm that the substrate temperature, Tc, is 105°C or less.
The average HIC power loss, PdAV, described above represents the power loss when there is no avalanche operation.
To add the loss during avalanche operations, be sure to add Equation (2), “Allowable STK672-6** Avalanche Energy
Value”, to PdAV.
No. A2115-21/26
STK672-630C-E
Figure 2 Substrate temperature rise, ΔTc (no heat sink) - Internal average power dissipation, PdAV
ΔTc - PdAV
80
70
60
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Hybrid IC internal average power dissipation, PdAV - W
ITF02553
Figure 3 Heat sink area (Board thickness: 2mm) - θc-a
θc-a - S
100
7
5
3
2
10
7
5
3
2
1.0
10
2
3
5
7
2
3
5
7
1000
100
Heat sink area, S - cm2
ITF02554
6. Mitigated Curve of Package Power Loss, PdPK, vs. Ambient Temperature, Ta
Package power loss, PdPK, refers to the average internal power loss, PdAV, allowable without a heat sink.
The figure below represents the allowable power loss, PdPK, vs. fluctuations in the ambient temperature, Ta.
Power loss of up to 3.1W is allowable at Ta=25°C, and of up to 1.75W at Ta=60°C.
Allowable power dissipation, PdPK(no heat sink) - Ambient temperature, Ta
PdPK - Ta
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
20
40
60
80
100
120
Ambient temperature,Ta - °C
ITF02511
No. A2115-22/26
STK672-630C-E
7. Example of Stepping Motor Driver Output Current Path (1-2 phase excitation)
2-phase stepping motor
I A
O
I AB
O
FAULT2 VrefOP
A
AB
F2
B
BB
8
7
4
5
3
1
V
=5V
9
V
DD
DD
F1
F3
F4
Excitatin
mode setting
MODE1 10
N.C 11
FAO
Phase
FAB
FBO
V
excitation
signal
CC
MODE2
CLOCK
CWB
17
12
13
Phase
advnce
counter
24V
generation
FBB
Opened
motor pin
detection
Latch
Latch
R2
R1
Power
on
reset
C02
at least 100μF
14
RESETB
Over
current
P.G2
ENABLE 15
FAULT1 16
detection
2
AI
BI
Chopper
circuit
FAULT1,
FAULT2
signal
P.GND
P.G1
6
Vref/4.9
Vref
Over heat
detection
Latch
Amp
SS
V
V
SS
18
19
N.C
Vref
CLOCK
Phase A output
current
I A
O
PWM operations
When PWM operations of I
A
O
are OFF, for I AB, negative
O
Phase AB output
current
current flows through the
parasitic diode, F2.
I AB
O
When PWM operations of I AB
O
are OFF, for I A, negative
O
current flows through the
parasitic diode, F1.
No. A2115-23/26
STK672-630C-E
8. Other Notes on Use
In addition to the “Notes” indicated in the Sample Application Circuit, care should also be given to the following
contents during use.
(1) Allowable operating range
Operation of this product assumes use within the allowable operating range. If a supply voltage or an input
voltage outside the allowable operating range is applied, an overvoltage may damage the internal control IC or
the MOSFET.
If a voltage application mode that exceeds the allowable operating range is anticipated, connect a fuse or take
other measures to cut off power supply to the product.
(2) Input pins
If the input pins are connected directly to the PC board connectors, electrostatic discharge or other overvoltage
outside the specified range may be applied from the connectors and may damage the product. Current generated
by this overvoltage can be suppressed to effectively prevent damage by inserting 100Ω to 1kΩ resistors in lines
connected to the input pins.
Take measures such as inserting resistors in lines connected to the input pins.
(3) Power connectors
If the motor power supply V
when the product is operated, such as for test purposes, an overcurrent flows through the V
CC
capacitor, C1, to the parasitic diode between the V
power supply pin block of the internal control IC.
is applied by mistake without connecting the GND part of the power connector
decoupling
of the internal control IC and GND, and may damage the
CC
DD
To prevent destruction in this case, connect a 10Ω resistor to the V
DD
pin, or insert a diode between the V
CC
decoupling capacitor C1 GND and the V
pin.
DD
Overcurrent protection measure: Insert a resistor.
V
=5V
A
4
AB
5
B
3
BB
1
DD
9
5V
Reg.
V
DD
F1
F2
F3
F4
FAO
FABO
FBO
MODE1
CLOCK
CWB
V
CC
FBBO
24V
Reg.
RESETB
ENABLE
MODE2
R1
R2
GND
C1
AI
BI
2
6
Vref
FAULT1
V
Vref
N.C
SS
18
open
Overcurrent protection measure: Insert a diode.
Over-current path
(4) Input Signal Lines
1) Do not use an IC socket to mount the driver, and instead solder the driver directly to the PC board to minimize
fluctuations in the GND potential due to the influence of the resistance component and inductance component
of the GND pattern wiring.
2) To reduce noise caused by electromagnetic induction to small signal lines, do not design small signal lines
(sensor signal lines, and 5V or 3.3V power supply signal lines) that run parallel in close proximity to the motor
output line A (Pin 4), AB (Pin 5), B (Pin 3), or BB (Pin 1) phases.
3) Pin 11 of this product are N.C pins. Do not connect any wiring to these pins.
No. A2115-24/26
STK672-630C-E
(5) When mounting multiple drivers on a single PC board
When mounting multiple drivers on a single PC board, the GND design should mount a V
decoupling
CC
capacitor, C1, for each driver to stabilize the GND potential of the other drivers. The key wiring points are as
follows.
24V
5V
9
9
9
Motor
1
Motor
2
Motor
3
Input
Signals
Input
Signals
Input
Signals
IC1
IC2
IC3
2
6
2
6
2
6
19
19
19
18
18
18
GND
GND
Thick
Thick and short
Short
(6) V
operating limit
CC
When the output (for example F1) of a 2-phase stepping motor driver is turned OFF, the AB phase back
electromotive force eab produced by current flowing to the paired F2 parasitic diode is induced in the F1 side,
causing the output voltage VFB to become twice or more the V
formula.
voltage. This is expressed by the following
CC
VFB = V
= V
+ eab
CC
CC
+ V
+ I × RM + Vdf (1.5 V)
CC OH
V
: Motor supply voltage, I : Motor current set by Vref
CC OH
Vdf: Voltage drop due to F2 parasitic diode and current detection resistor R1, RM: Motor winding resistance
value
Using the above formula, make sure that VFB is always less than the MOSFET withstand voltage of 100V. This
is because there is a possibility that operating limit of V
falls below the allowable operating range of 46V, due
CC
to the RM and I
specifications.
OH
V
CC
V
CC
AB phase
eab
A phase
AB phase
A phase
Eab is induced by
inducing M.
The pass of
drain current
The pass of
negative current
VFB
M
M
eab
V
CC
F2
F2
OFF
OFF
F1
OFF
F1
ON
R1
GND
R1
GND
The oscillating voltage in excess of VFB is caused by LCRM (inductance, capacitor, resistor, mutual inductance)
oscillation that includes micro capacitors C, not present in the circuit. Since M is affected by the motor
characteristics, there is some difference in oscillating voltage according to the motor specifications. In addition,
constant voltage drive without constant current drive enables motor rotation at V
≥ 0V.
CC
No. A2115-25/26
STK672-630C-E
SANYO Semiconductor Co.,Ltd. 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 Semiconductor Co.,Ltd.
products described or contained herein.
Regarding monolithic semiconductors, if you should intend to use this IC continuously under high temperature,
high current, high voltage, or drastic temperature change, even if it is used within the range of absolute
maximum ratings or operating conditions, there is a possibility of decrease reliability. Please contact us for a
confirmation.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
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without the prior written consent of SANYO Semiconductor Co.,Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellectual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of August, 2012. Specifications and information herein are subject
to change without notice.
PS
No. A2115-26/26
相关型号：
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