SLA7082MPR [SANKEN]
Stepper Motor Controller, 2A, ZIP-23;
| 型号： | SLA7082MPR |
| 厂家： | 
SANKEN ELECTRIC |
| 描述： | Stepper Motor Controller, 2A, ZIP-23 局域网 电动机控制 |
| 文件： | 总18页 (文件大小：434K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Features and Benefits
Description
▪ Power supply voltage, VBB, 46 V maximum; 10 to 44 V
normal operating range
ThisdocumentdescribesthefunctionandfeaturesofSLA7080M
series, which are unipolar 2-phase stepping motor driver ICs.
Fourlevelsofoutputcurrentareavailablefromtheincorporated
MOSFETs, corresponding to the rated output current ratings.
All current ratings are available with protection against motor
coil shorts or motor open wire detection.
▪ Logic supply voltage, VDD, 3 to 5.5 V
▪ Four output currents, IO(max), options: 1, 1.5, 2, and 3 A
▪ Stepping control for phase input (full or half step)
▪ Built-in sense resistor detects motor current
▪ Compact ZIP 23-pin molded package (SLA package)
▪ Self-excitation PWM control with fixed off-time
▪ Built-in synchronous rectifying circuit reduces losses at
PWM-off
The SLA7080M series has a multichip structure, for enhanced
thermaldispersion.TheControlIC(MIC),fourpowerelements
(MOSFET), and dual sense resistors, are all separate ICs.
▪ Synchronous PWM function prevents noise generation in
motor Hold mode
▪ Sleep function reduces power consumption of drivers in
Standby mode
Built-in sense resistors for each phase allow accurate track-
ing of performance without additional external components.
Low-powersleepmodeaswellasreducedpowerduringPWM
off-time maximize energy savings.
▪ Protection circuit detects motor coil open/short and
prevents overheating due to avalanche breakdown
▪ Externally-adjustable (3.2 μs/5.2 μs) blanking time
(minimum on-time)
Package: 23-pin ZIP (type SLA)
Not to scale
Functional Block Diagram
MIC
Reg.
Pre-
Pre-
Driver
Driver
Logic Block
Protect
Protect
+
+
Comp
-
Synchro
Control
Comp
-
SENSEB
SENSEA
PWM
PWM
Control
Control
R
s
R
s
OSC
OSC
SYNC
GND
28610.23, Rev. 1
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Selection Guide
Output Current
Built-In Sense
Packing
Part Number
(A)
Resistor
SLA7080MPR
1
SLA7081MPR
SLA7082MPR
SLA7083MPR
1.5
2
Yes
18 pieces per tube
3
Absolute Maximum Ratings, valid at TA = 25°C
Characteristic
Symbol
Notes
Rating
Unit
V
Motor Supply Voltage
VM
46
Main Supply Voltage
Logic Supply Voltage
VBB
46
V
VDD
6
V
SLA7080MPR
1.0
A
SLA7081MPR
SLA7082MPR
SLA7083MPR
1.5
2.0
A
Output Current
IO
A
3.0
A
Logic Input Voltage
VIN
VREF
PD
–0.3 to VDD + 0.3
–0.3 to VDD + 0.3
4.7
V
REF Input Voltage
V
Allowable Power Dissipation
Maximum Junction Temperature
Nominal Operating Temperature
Storage Temperature
No heatsink
W
ºC
ºC
ºC
TJ(max)
TA
150
–20 to 85
–30 to 150
T
stg
Recommended Operating Range
Characteristic
Symbol
VM
Notes
Min
–
Max
44
Unit
V
Motor Supply Voltage
Main Supply Voltage
VBB
10
3.0
–
44
V
Logic Supply Voltage
VDD
VDD surge voltage = ± 0.5 V
5.5
90
V
Without heatsink
With heatsink
ºC
ºC
On pin 12, adjacent
to case
Case Temperature
TC
–
80
All performance characteristics given are typical values for circuit or
system baseline design only and are at the nominal operating voltage and
an ambient temperature, TA, of 25°C, unless otherwise stated.
28610.23, Rev. 1
2
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
ELECTRICAL CHARACTERISTICS valid at TA = 25°C, VBB = 24 V and VDD = 5 V, unless otherwise noted
Characteristics
Symbol
IBB
Conditions
Min
–
Typ
–
Max
15
Units
mA
μA
mA
Ω
In operation
Sleep state
Main Supply Current
IBBS
–
–
100
5
Logic Supply Current
IDD
–
–
SLA7080MPR
–
0.7
0.45
0.25
0.18
0.85
1.0
0.95
0.95
–
0.85
0.6
0.4
0.24
1.1
1.25
1.2
2.1
–
SLA7081MPR
–
Ω
Output MOSFET On-Resistance
RDS(on)
SLA7082MPR
–
Ω
SLA7083MPR
–
Ω
SLA7080MPR
–
V
SLA7081MPR
–
V
Output MOSFET Diode Forward
Voltage
VF
SLA7082MPR
–
V
SLA7083MPR
–
V
Output MOSFET Breakdown Voltage
Maximum Response Frequency
VDSS
fclk
VBB = 44 V, ID = 1 mA
Clock duty cycle = 50%
100
250
V
–
–
kHz
VDD
0.25
×
VIL
VIH
–
–
–
V
V
Logic Input Voltage
Logic Input Current
VDD
0.75
×
–
IIL
–
–
±1
±1
–
–
–
μA
μA
V
IIH
SLA7080MPR
0.04
0.04
0.04
2.0
–
0.3
0.45
0.4
VDD
–
VREF
SLA7081MPR, SLA7083MPR
SLA7082MPR
–
V
REF Input Voltage
–
V
VREFS
IREF
Sleep state (output off)
–
V
REF Input Current
±10
μA
VREF
0.03
–
VREF
0.03
+
SENSE Detect Voltage
VSENSE
VREF
V
SLA7080MPR, SLA7081MPR
SLA7082MPR
0.296 0.305 0.314
0.199 0.205 0.211
0.150 0.155 0.160
Ω
Ω
Sense Resistor1
Rs
SLA7083MPR
Ω
B_SEL = low
–
–
3.2
5.2
13
–
–
–
–
–
–
–
ꢀs
ꢀs
ꢀs
ꢀs
ꢀs
ꢀs
PWM Minimum On-Time (Blanking
Time)
ton(min)
B_SEL = high
PWM Off-Time
toff
tSE
tdon
tdoff
–
Sleep Enable Recovery Time
Sleep state
100
–
Phase INx → Phase OUTx on
Phase INx → Phase OUTx off
1.5
1.0
Switching Time
–
Continued on the next page…
28610.23, Rev. 1
3
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
ELECTRICAL CHARACTERISTICS (continued) valid at TA = 25°C, VBB = 24 V and VDD = 5 V, unless otherwise noted
Characteristics
Protection Functions2
Symbol
Conditions
Min
Typ
Max
Units
Overcurrent Detect Voltage
VOCP
At motor coil short circuit
0.65
–
0.7
2.3
3.5
4.5
2.0
0.75
–
V
A
SLA7080MPR, SLA7081MPR
SLA7082MPR
Overcurrent Detect Current
(VOCP / RS)
IOCP
–
–
A
SLA7083MPR
–
–
A
Delay to Open Load Detect
tOPP
1.5
2.5
μs
Measured at back surface of device case; device operating
such that self-generated heat has permeated detection circuits
on MIC; see Thermal Design section
Overtemperature Protection Threshold
Temperature
TTSD
–
140
–
°C
VFLAGL
VFLAGH
IFLAGL = 1.25 mA
IFLAGH = –1.25 mA
–
–
–
1.25
–
V
V
FLAG Output Voltage
FLAG Output Current
VDD
1.25
–
IFLAGL
IFLAGH
1External sense resistor value approximately 5 mΩ in addition to value of built-in resistor.
2Protection circuit operates when VSENSE ≥ VOCP
–
–
–
1.25
–
mA
mA
–1.25
.
Power Derating Chart
5
4
3
2
1
0
R
θJA
= 26.6°C/W
0
10 20 30 40 50 60 70 80 90
Ambient Temperature, TA (°C)
28610.23, Rev. 1
4
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Performance Characteristics at TA = 25°C
1.4
1.2
1.4
1.2
1.0
1.0
SLA7080MPR
MOSFET VDS(on)
vs. Case
Temperature
SLA7081MPR
MOSFET VDS(on)
vs. Case
I
O = 1 A
IO = 1.5 A
0.8
0.8
0.6
0.4
0.2
0
0.6
Temperature
IO = 0.5 A
I
O = 1 A
0.4
0.2
0
–25
0
25
50
75
100
125
–25
0
25
50
75
100
125
TC (°C)
TC (°C)
1.4
1.2
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.0
SLA7082MPR
SLA7083MPR
MOSFET VDS(on)
vs. Case
IO = 3 A
0.8
MOSFET VDS(on)
IO = 2 A
vs. Case
I
O = 2 A
0.6
Temperature
Temperature
IO = 1 A
0.4
0.2
IO = 1 A
0
–25
0
25
50
75
100
125
–25
0
25
50
75
100
125
TC (°C)
TC (°C)
1.1
1.1
1.0
0.9
0.8
0.7
0.6
1.0
IO = 1.5 A
IO = 1 A
SLA7080MPR
MOSFET
Body Diode
Vf vs. Case
SLA7081MPR
MOSFET
Body Diode
Vf vs. Case
Temperature
0.9
0.8
Temperature
IO = 1 A
IO = 0.5 A
0.7
0.6
–25
0
25
50
TC (°C)
75
100
125
–25
0
25
50
TC (°C)
75
100
125
1.1
1.1
1.0
0.9
0.8
0.7
0.6
IO = 3 A
1.0
I
O = 2 A
I
I
O = 2 A
O = 1 A
SLA7082MPR
MOSFET
Body Diode
Vf vs. Case
SLA7083MPR
MOSFET
Body Diode
Vf vs. Case
Temperature
0.9
0.8
Temperature
I
O = 1 A
0.7
0.6
–25
0
25
50
TC (°C)
75
100
125
–25
0
25
50
TC (°C)
75
100
125
28610.23, Rev. 1
5
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Functional Description
PWM control mode is set by the SYNC pin. Set SYNC to logic
Logic Block
high for synchronous PWM, and set it to logic low for asynchro-
nous PWM.
This circuit block is integrated on the Control IC (MIC). It oper-
ates by the logic power supply, VDD , and propagates signals to
each circuit block in accordance with the logic input signals.
PWM Off-Time, toff, (for self-excitation), minimum off-time (for
external excitation), and PWM Minimum On-Time (blanking
time), ton(min), are clocked by means of the built-in oscillator.
Regulator Circuit
This circuit block is integrated on the Control IC (MIC). The
integrated regulator circuit is used in driving the output MOSFET
gates and in powering other internal linear circuits.
The length of toff is fixed internally. Like in the SLA7070M
series, the SLA7080M series has a power-saving function that
reduces power consumption during toff. This function recirculates
electromotive force that is stored in the motor coil while the
power MOSFETs are turned on.
Dual Phase Output Control
The SLA7080M series allows dual phase operation based on
external input to the INx pins. The phase-switching logic is
shown in the following table:
The time interval during which the output MOSFETs are on is ton.
The minimum duration for the PWM Minimum On-time, ton(min)
is effectively the blanking time selected, even if the application
attempts to shorten ton in order to limit current. The minimum coil
current is at ton(min), so when the coil current is limited at power-
down or other events, it can be no shorter than the blanking time.
,
Phase A [B]
¯¯¯¯¯ ¯¯¯¯¯
INA [INB] OUTA [OUTB]*
¯¯¯¯¯¯¯¯ ¯¯¯¯¯¯¯¯
INA [INB]
Low
OUTA [OUTB ]*
Low
Low
High
High
OFF
ON
OFF
OFF
ON
High
Low
OFF
OFF
Blanking Time
High
OFF
The blanking time function is provided to limit current in order
to suppress ringing immediately after PWM turns on, and to
improve current control tracking. Blanking time in effect deter-
mines PWM Minimum On-Time, ton(min). The length of the blank-
ing time is selected by the B_SEL pin. Set B_SEL to logic high
for 3.2 μs blanking time, and set it to logic low for 5.2 μs.
*OUT indicates power MOSFET drain state (does not
indicate PWM operation)
PWM Control
This circuit block is integrated on the Control IC (MIC). This is
the main circuit block for pulse width modulated (PWM) control
of self-excitation and external excitation for motor driving. An
illustration of PWM behavior is shown in figure 1.
Some ringing is generated for a few microseconds after PWM
switching (see figure 2). Ringing can result from various causes,
such as capacitance between motor cells, or inappropriate motor
wiring. To suppress this behavior, the blanking time selection sets
a minimum time interval during which current detection signals
from the current sense comparators are ignored after a PWM
switch-on.
Phase A [B]
One PWM Cycle
VOUT
ton
toff
A [B]
ITRIP
Current control (tracking) in the SLA7080M series is regulated
by comparing the detection voltage on the sense resistor, VRS
with the reference voltage, VREF. If the ringing noise causes VRS
to exceed VTRIP, the comparator is activated and PWM turns off.
,
0
A [B]
Current control performance at shorter PWM waveforms can
be improved by shortening the blanking time, but this decreases
the effectiveness of ringing suppression, resulting in the seek-
ing behavior shown in figure 3.) To solve this problem, the
SLA7080M series is designed to allow dynamic selection of
blanking time duration. In the event that the seeking behavior
ton(min)
Figure 1. PWM waveform on SLA7080M sense resistor, RS; toff is fixed and
the blanking time, toff(min), is dynamically selectable.
28610.23, Rev. 1
6
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
occurs when the short blanking time is selected, the problem may puts, and sets the FLAG pin. To leave protection mode and return
be eased by the selection of the longer blanking time.
to normal operation, cycle the logic power supply, VDD.
A comparison of these trade-offs is provided in the following
table (comparisons assume that operating conditions other than
the SLA7080M, such as motors, motor power supply voltage,
REF input voltages and so forth, as well as circuit constants, are
identical in each case).
Protection is activated by sensing voltage on the internal sensing
resistors, RS. Overcurrent that flows without passing the sense
resistors cannot be detected. Therefore, this does not detect an
overcurrent condition resulting from the OUT pins or SENSE
pins shorting to GND.
Protection against motor coil opens is available only during
PWM operation. Therefore, it does not work during constant volt-
age driving, when the motor is rotating at high speed.
Parameter
Better Performance
Short or Long
Short
Internal Blanking Set Time
Minimize PWM On-time (minimum)
Maximize Ringing Noise Suppression
Minimize Coil Current
Motor Coil Short Circuit Protection (Load Short Circuit)
This function operates by detecting voltage VRS on the internal
sense resistors in the same manner as the current control function.
The threshold voltage, VOCP, is set to 0.7 V typical. When VRS
Long
Short
Synchronous Control
The SLA7080M series has a chopping synchronous function
to prevent noise which may occasionally be generated during
the motor Hold state. This function can be operated by setting
the SYNC pin to logic high, which generates a timing signal to
synchronize the chopping of the A and B phases. (This function
operates identically to that of the SLA7070M.)
20 μs/div
This function should be used only during self-excitation PWM
control. The use of synchronous control during normal stepping
motor rotation is not recommended because it produces less
motor torque or may cause motor vibration because the control
current does not stabilize.
Protection Circuit
A built-in protection circuit detects against motor coil opens and
shorts. Operation of the protection circuit disables all of the out-
Figure 3. PWM waveform exhibiting seeking behavior
5 μs/div
500 ns/div
ITRIP
I
TRIP
(A)
(B)
Figure 2. Ringing on PWM waveform while driving a motor. The circled area in
panel A is expanded in time and shown in panel B.
28610.23, Rev. 1
7
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
> VOCP the motor coil short-circuit protection starts its operation.
Coil short circuit and the protection circuit behavior are illus-
trated in figure 4.
the MOSFET. Although the MOSFETs in the SLA7080M series
have an ample avalanche breakdown rating for rated operating
temperatures, the avalanche breakdown rating decreases as the
operating temperature rises (as avalanche breakdown is repeated).
When the SLA7080M series protection circuit detects avalanche
breakdown, it allows the breakdown to repeat 3 times to prevent
false detections and then turns off the MOSFET outputs before
overheating can occur.
Motor Coil Open Protection (Load Open Circuit)
(Patent pending.) This function operates by detecting polarity
reversal of voltage VRS on the internal sense resistors. After the
state is confirmed, the device shuts down the outputs. This allows
detection of a wire of the motor coil breaking. Coil open circuit
and the protection circuit behavior are illustrated in figure 5.
The detection function operates as follows. When the wire of
the motor coil is broken, the regenerating current that can reach
the MOSFET breakdown level flows during the PWM off-time.
Although the detection voltage, VRS, has negative potential in
normal operation, when a wire breaks in the motor coil, positive
potential appears during a PWM off-time. That is to say, wire
breakage in the motor coil can be detected, when VRS is detected
with positive potential during PWM off-time.
In a unipolar topology, an undetected broken wire on an out-
put pin (motor coil), can cause destruction of the driver due to
overheating. This is because after the wire breaks, the connected
driver MOSFET repeatedly undergoes avalanche breakdown
at PWM turn-off, due to the higher energy applied from back
electromagnetic force, as the energy stored in the motor coil is
dissipated. Avalanche breakdown occurs when the output voltage
surpasses the breakdown voltage between the drain and source of In addition to requiring three breakdown cycles to confirm the
Disconnection
Stepper
Motor
Stepper
Motor
Stepper
Motor
SLA7080M
SLA7080M
SLA7080M
VG
VG
VG
VG
VOUT
ION
ION
Normal current
Coil short circuit
VRS
RS
RS
RS
VRS
IOFF
IOFF
VG
VG
Coil short circuit
Output disable
0
0
VOCP
VDSS
VM
VOUT
2 × VM
VOUT
VREF
0
0
0
0
Avalanche breakdown
Open detection
VREF
VREF
VRS
0
VRS
VRS
(A)
(B)
Figure 5. Motor coil open circuit protection in unipolar configuration, (A) PWM normal
operation, (B) PWM operation with motor partially disconnected or broken wire in coil;
Figure 4. Motor coil short circuit protection operation
V
M is the motor control voltage
28610.23, Rev. 1
8
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
open circuit condition, the SLA7080M protection function also
provides a fixed delay, topp, before the device shuts down the
outputs. This is to avoid false detections based on ringing after
PWM turn-off. Referring to figure 6, if the breakdown confirma-
tion interval (3 breakdown cycles) plus ringing effects are shorter
than topp , the protection circuit functions correctly. However, if
ringing causes the total period to exceed topp, false detections can
occur. If this is the case, check the motor and wiring layout to
reduce ringing. Variation among device variants and applications
should be taken into consideration. One possible solution is the
addition of a capacitor between the OUTx and GND pins, which
could damp the ringing sufficiently to allow continuation of nor-
mal operation when there is no actual avalanche breakdown.
Power Supply
There is no restriction on the on/off sequencing of the main power
supply, VBB, and the logic supply, VDD. Because the SLA7080M
series has a structure that separates the Control IC (MIC) with the
power MOSFET of the output stage, the motor power supply and
the main power supply are electrically separated. Therefore, it is
possible to drive the device by using different voltages for motor
power supply and main power supply. Note that the power sup-
plies have different voltage ranges.
I
I
OFF
ON
Synchronous Rectification
A dead time, approximately 0.5 ꢀs, is set to prevent simultane-
ous turn-on of the MOSFETs at switching during synchronous
rectification. During the dead time, the regenerating current flows
through the body diode on each MOSFET chip, as shown in
figure 7.
Stepper
Motor
SLA7080M
V
V
G
G
Normal current
V
RS
R
S
Back EMF during
dead time
tOPP
tOPP
tOPP
PWM On
PWM Off
PWM On
V
DSS
V
V
G
0
0
t
t
DEAD
V
DEAD
OUT
G
tCONFIRM
tCONFIRM
tCONFIRM
V
REF
(A)
(B)
(C)
V
0
RS
Figure 6. Alternative topp scenarios: (A) no ringing, breakdown confirmed
after three cycles, (B) ringing plus three cycles is less than topp with no
effect on operations, and (C) ringing is greater than topp generates false
detections of breakdowns
Figure 7. Synchronous rectification operation
28610.23, Rev. 1
9
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Application Information
¯¯¯¯¯¯
¯¯¯¯¯¯
Because the VOCP level occurs in the Prohibited range, between
those two areas, if the switching time is too lengthy, overcurrent
INA, INA, INB, INB, B_SEL, and SYNC pins
These inputs operate with CMOS input. The default state is high
impedance, and they must be driven to logic high or logic low.
When these logic input pins are used, they should be pulled down
to the ground side using a 1 to 10 kΩ resistor. Any of these pins
that are not used must either be pulled up to the VDD side or be
pulled down to the ground side.
protection will start operating when VSENSE > VOCP
.
FLAG pin
This is the output for the protection circuit:
FLAG Pin Output Logic
Low
Normal operation
If they are left open, malfunction or permanent damage to the
product may result. For example, in case the signal from the
microcomputer has high impedance, a pull-down or pull-up resis-
tor should be provided. In particular, when an INx pin is in high
impedance during operation, abnormal oscillation of the output
may be caused and in the worst case, this will result in permanent
damage to the MOSFETs.
High
Protection circuit operation
It is designed for CMOS output, as shown in the equivalent
circuit in figure 10. Therefore, if the FLAG logic pin is not used,
it must be left open.
Internal Sense Resistors, RS
Sense resistors which detect motor currents are incorporated in
this product series. The values of the internal sense resistors, RS ,
can be calculated (for the standard SLA7080M variants listed in
this document) by applying the power loss formula:
A low pass filter (LPF) is provided on each the logic input pin.
These improve noise filtering.
Sleep Mode
The SLA7080M can be set into Sleep mode, in which the motor
is not controlled, so it can move freely. To enable Sleep mode, set
the REF pin at more than 2 V. In Sleep mode, the device stops the
main power supply and decreases circuit current.
P ≈ IO2 × RS .
When shifting the device directly from the Sleep mode to the
normal operating mode (motor rotation), not only the rise time
of the device, but also the rise time of motor excitation current
should be considered when determining the amount of time lag
from the cancellation of Sleep mode to the next motor phase
input command. As shown in figure 8, a minimum lag of 100 μs
is recommended.
V
DD
Sleep Limit Range
2.00
Because of the built-in circuit protection features, be cautious
about taking too long when switching between the Motor Cur-
rent Setting range and the Sleep Limit range (refer to figure 9).
V
REF
(V)
Prohibited Range
V
Detect
OCP
(Typical)
0.70
REF
0.45
0.30
100 μs (min)
0.40
Phase
Command
Motor Current
Setting Range
1.5 A,
3.0 A
2.0 A
1.0 A
0.04
Figure 8. External circuit for detecting phase control signals
Figure 9. Reference voltage, VREF, ranges
28610.23, Rev. 1
10
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
The resistance value of the incorporated resistors varies accord-
ing to the rated currents.
When the clock signal is stopped at low level, the capacitor is dis-
charged by the resistor and the SYNC signal is set to logic high,
causing the SLA7080M to shift to the synchronous mode.
Rated Current
Detected Resistance Value
The RC time constant should be determined by the minimum
clock frequency used. In the case of a sequence that keeps the
clock input signal at logic high, an inverter circuit must be added.
(A)
1
(Ω Typical)
0.305
1.5
2
0.305
0.205
Setting Motor Currents for Constant Running
In the SLA7080M series the motor current level, IO , is deter-
mined by the internal sense resistors, RS, and the values selected
for the external components R1 and R2 (see figure 12).
3
0.155
Each resistance value shown above includes the inherent resis-
tance (approximately 5 mΩ) in the SLA7080M due to product
structure.
Io is calculated by the following formulas:
R2
In particular, be cautious about noise on the VDD line. When
the noise on VDD line exceeds 0.5 V, device malfunction may
be caused. To avoid this, special attention should be paid to the
layout of the ground circuits. The separation of the VDD ground
and the VBB ground from the product GND pin is effective in
reducing the noise.
(2)
(3)
VREF
=
× VDD
R1 + R2
VREF
RS
IO
=
If VREF is set below 0.04 V, the accuracy of IO setting is highly
likely to be degraded due to the variation between individual
devices and the impedance of the application trace layout.
Clocking Switch Signals
In normal operation, the input signal for switching is received
from an external microcomputer into the INx pins. However, in
an application where the signal cannot be input, for example, due
to the limitation of ports, this function can be performed using the
following method. Refer to figure 11, which illustrates a topol-
ogy for a synchronization signal generation circuit that uses clock
signals.
Lower Limit of Motor Current Control
The SLA7080M series uses a self-excitation PWM current con-
trol system with the fixed PWM off-time, toff. When the energy
stored in the motor coil is dissipated in less than toff , the coil
current flows as an intermittent current as shown in figure 13.
That is to say, the PWM average current is decreased and the
motor torque is lowered. When the current begins to flow in the
coil intermittently, this state is considered the lower limit of the
current control, IO(min).
When a logic high level signal is input to the circuit, the capacitor
in the circuit is charged and the SYNC signal is set to logic low
level in the SLA7080M.
V
DD
SLA7080MPR
V
CC
Phase
ESD
protection
SYNC
FLAG
74HC14
SLA7080M
Figure 10. FLAG pin equivalent circuit
28610.23, Rev. 1
Figure 11. External circuit for detecting phase control signals
11
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar2-PhaseStepingMotorDriverICs
The lower limit of the control current varies subject to application
conditions, such as the motors used, but it can be calculated by
the following formula:
Where:
T is L / R ,
c
M
M
V
M
is the motor supply voltage,
I
O
is the set current value,
L
M
is the motor winding inductance,
R
R
is the MOSFET on-resistance,
DS(on)
is the motor winding resistance, and
is the PWM of -time.
M
t
off
Even if the set control current, IO , is set at less than the calculated
IO(min), there is no harmful effect on the SLA7080M devices,
but the control current will worsen against set current.
Figure 13. Motor current lower limit typical waveforms; circled area
indicates interval when 0 A coil current is generated
Figure 12. Typical application circuit using SMA7080MPR
28610.23, Rev. 1
12
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
result from testing (refer to figure 15):
Verification of Avalanche Energy
Due to the unipolar topology of the SLA7080M series, a surge
voltage (ringing) that exceeds the MOSFET breakdown volt-
age might be applied to the device. In anticipation of this surge
voltage, the SLA7080M series uses MOSFETs having sufficient
avalanche resistance to withstand such surge voltages. Therefore,
even if a surge voltage occurs, users will be able to use the device
without any problem.
V
DS(av) = 140 V
ID = 1 A
t = 0.5 ꢀs
The avalanche energy, EAV, is obtained by substituting values into
the following formula:
(2)
EAV
V
DS(av)× 0.5 × ID × t
≈
140 V × 0.5 × 1 A × 0.5 × 10-6
0.035 (mJ)
=
=
However, if the motor wiring harness is long or the SLA7080M
is used at greater than the rated current or voltage, an avalanche
energy beyond our design expectations may be applied to the
device. Thus, users must test the avalanche energy applied to the
device under actual application conditions.
The EAV thus calculated is compared with the graph shown in
figure 15 to confirm that the EAV is within the safe operating area
of the avalanche breakdown voltage of the MOSFETs.
Thermal Design
The following procedure can be used to check the avalanche
energy in an actual application. The following typical values
The SLA7080M series incorporates a thermal protection func-
tion that shuts down all outputs when the Control IC tempera-
ture exceeds TTSD. However, a comprehensive overtemperature
protection function is not provided because the Control IC chip
is separate from the MOSFET chips, the power elements which
are the primary sources of heat. It would be unable to respond to
sudden temperature changes in the MOSFETs because of delays
in diffusion of the heat.
Stepper
I
D
Motor
Therefore, sufficient thermal evaluation should be performed
with the actual application, so that the junction temperature,
TJ , does not exceed the absolute maximum rating (150°C).
Experimentation is required because it is not practical to calcu-
late a realistic power dissipation value, which involves variable
parameters such as time constants and excitation modes during
actual operation of motors, input frequencies and sequences, and
so forth.
SLA7080M
V
DS(av)
R
S
20
16
SLA7083MPR
V
DS(av)
12
SLA7082MPR
8
SLA7081MPR
4
I
D
SLA7080MPR
0
0
25
50
75
(°C)
100
125
150
t
T
C
Figure 14. Test points and waveform for testing avalanche energy of an
application
Figure 15. Avalanche breakdown voltages for repeated cycles
28610.23, Rev. 1
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SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Given this situation, for initial design estimates, power dissipa-
tion should be calculated by approximation, using worst-case
conditions, at 2-phase excitation:
formula:
RθJA ≈ RθCA + RθHS
= (RθJA – RθCA ) + RθHS
where RθHS is the thermal resistance of the heatsink.
,
(7)
PD = IO2 × (RDS(on) + RS) × 2 ,
(6)
where:
To estimate the junction temperature rise, ΔTJ , from the device
temperature measured in the actual operating application, ΔTCA
the following procedure should be followed:
PD is the power dissipation of the SLA7080M,
IO is the Output Current,
,
RDS(on) is the on-resistance of the MOSFETs, and
RS is the Sense Resistor Resistance.
1. The temperature rise of the product, ΔTCA, is measured on pin
12, where it enters the case.
Based on the power dissipation of the product thus calculated,
the junction temperature of the product is estimated by using the
temperature rise curves of figure 16.
2. From the temperature rise thus obtained, the power dissipation,
PD , and the junction temperature, TJ , are estimated using
figure 16.
Unless the temperature exceeds 150°C under the worst condi-
tions (the maximum values of ambient operating temperature),
there will be no problem, but final judgment should be made by
measuring the device temperature during the actual operation
and then verifying power dissipation and junction temperature in
accordance with figure 16.
3. Calculate the relationship between ΔTCA and the junction
temperature rise, ΔTJ, using the following formula:
ΔTJ ≈ ΔTJC + PD × RθJC
.
(8)
Note that this thermal design information is provided for pre-
liminary design estimations only. Users should verify the heat
generation of the product in the actual operation, by measuring
the case temperature, TC, and comparing it to the Recommended
Operating Conditions table values.
When the device is used with a heatsink, the thermal resis-
tance, RθJA, of the device changes (as do the parameters used in
calculating ΔTJA ). This value is calculated from the following
150
125
100
75
∆T = 26.6 × P
JA
D
∆T = 21.3 × P
CA
D
50
25
0
0
0.5 1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Allowable Power Dissipation, P (W)
D
Figure 16. Power dissipation estimate for junction-to-ambient and case-to-
ambient temperature change
28610.23, Rev. 1
14
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Pin-out Diagram
Pad Side
2
4
6
8
10
12
14
16
18
20
22
1
3
5
7
9
11
13
15
17
19
21
23
Terminal List Table
Number
Name
Function
1
OUTA
2
Output (phase A)
3
¯¯¯¯¯¯¯¯
OUTA
4
5
SENSEA
B_SEL
INA
Current sense (phase A)
6
Blanking time switching input
7
Switching input (phase A)
¯¯¯¯¯
INA
8
9
INB
Switching input (phase B)
¯¯¯¯¯
INB
10
11
12
13
14
15
16
17
18
19
20
21
22
23
VBB
Main power supply (motor supply)
Device ground terminal
Control current/sleep enable input
Logic supply
GND
REF/SLEEP
VDD
GND1
Ground 1 terminal
GND2
Ground 2 terminal
SYNC
PWM synchronous/non-synchronous switching
Output of protection circuit monitor
Current sense (phase B)
FLAG
SENSEB
¯¯¯¯¯¯¯¯
OUTB
Output (phase B)
OUTB
28610.23, Rev. 1
15
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Package Outline Drawing
Dual rows, 23 alternating pins; vertical case mounting; pin #1 opposite pad side
Exposed
heatsink pad
31.3 ±0.2
31 ±0.2
24.4 ±0.2
16.4 ±0.2
4.8 ±0.2
0.6
Gate protrusion
1.7 ±0.1
Ø3.2 ±0.15
Ø3.2 ±0.15
Gate protrusion
2.45 ±0.2
BSC
16 ±0.2
B
12.9 ±0.2
9.9 ±0.2
Branding Area
R1
REF
5 ±0.5
+0.1
– 0.5
9.3
+0.2
– 0.1
0.55
4.3
REF
View A
1.27 ±0.5
4.5 ±0.7
A
+0.2
– 0.1
0.65
1
3
5
7
9
11
13
15
17
19
21
23
2
4
6
8
10
12
14
16
18
20
22
0.7 MAX
Terminal core material: Cu
Terminal plating: Ni, with Pb-free solder coating
Recommended attachment: Solder dip (Sn-Ag-Cu)
A
B
Measured at pin tips
To case top
Deflection at pin bend
View A
Dimensions in millimeters
Branding codes (exact appearance at manufacturer discretion):
1st line, type: SLA708xMR
2nd line, protection: P
3rd line, lot:
YMDD
Where: Y is the last digit of the year of manufacture
M is the month (1 to 9, O, N, D)
DD is the date
Leadframe plating Pb-free. Device composition
complies with the RoHS directive.
28610.23, Rev. 1
16
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Because reliability can be affected adversely by improper storage
environments and handling methods, please observe the following
cautions.
Heatsink Mounting Method
Torque When Tightening Mounting Screws. The recommended tightening
torque for this product package type is: 58.8 to 78.4 N•cm (6.0 to
Cautions for Storage
8.0 kgf•cm).
•
Ensure that storage conditions comply with the standard
temperature (5°C to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience
extreme changes in temperature or humidity.
Soldering
•
When soldering the products, please be sure to minimize the
working time, within the following limits:
260±5°C 10 s
•
•
Avoid locations where dust or harmful gases are present and
avoid direct sunlight.
Reinspect for rust on leads and solderability of products that have
been stored for a long time.
380±5°C 5 s
•
Soldering iron should be at a distance of at least 1.5 mm from the
body of the products
Electrostatic Discharge
Cautions for Testing and Handling
•
When handling the products, operator must be grounded.
Grounded wrist straps worn should have at least 1 Mꢁ of
resistance to ground to prevent shock hazard.
Workbenches where the products are handled should be
grounded and be provided with conductive table and floor mats.
When using measuring equipment such as a curve tracer, the
equipment should be grounded.
When soldering the products, the head of soldering irons or the
solder bath must be grounded in other to prevent leak voltages
generated by them from being applied to the products.
The products should always be stored and transported in our
shipping containers or conductive containers, or be wrapped in
aluminum foil.
When tests are carried out during inspection testing and other
standard test periods, protect the products from power surges
from the testing device, shorts between adjacent products, and
shorts to the heatsink.
•
•
•
Remarks About Using Silicone Grease with a Heatsink
•
When silicone grease is used in mounting this product to a
heatsink, it shall be applied evenly and thinly. If more silicone
grease than required is applied, it may produce stress.
Volatile-type silicone greases may permeate the product and
produce cracks after long periods of time, resulting in reduced
heat radiation effect, and possibly shortening the lifetime of the
product.
•
•
•
Our recommended silicone greases for heat radiation purposes,
which will not cause any adverse effect on the product life, are
indicated below:
Type
G746
Suppliers
Shin-Etsu Chemical Co., Ltd.
Momentive Performance Materials Inc.
Dow Corning Toray Co., Ltd.
YG6260
SC102
28610.23, Rev. 1
17
SANKEN ELECTRIC CO., LTD.
SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
• The contents in this document are subject to changes, for improvement and other purposes, without notice. Make sure that this is the
latest revision of the document before use.
• Application and operation examples described in this document are quoted for the sole purpose of reference for the use of the prod-
ucts herein and Sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or
any other rights of Sanken or any third party which may result from its use.
• Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semicon-
ductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures
including safety design of the equipment or systems against any possible injury, death, fires or damages to the society due to device
failure or malfunction.
• Sanken products listed in this document are designed and intended for the use as components in general purpose electronic equip-
ment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.).
When considering the use of Sanken products in the applications where higher reliability is required (transportation equipment and
its control systems, traffic signal control systems or equipment, fire/crime alarm systems, various safety devices, etc.), and whenever
long life expectancy is required even in general purpose electronic equipment or apparatus, please contact your nearest Sanken sales
representative to discuss, prior to the use of the products herein.
The use of Sanken products without the written consent of Sanken in the applications where extremely high reliability is required
(aerospace equipment, nuclear power control systems, life support systems, etc.) is strictly prohibited.
• In the case that you use Sanken products or design your products by using Sanken products, the reliability largely depends on the
degree of derating to be made to the rated values. Derating may be interpreted as a case that an operation range is set by derating the
load from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability. In general,
derating factors include electric stresses such as electric voltage, electric current, electric power etc., environmental stresses such
as ambient temperature, humidity etc. and thermal stress caused due to self-heating of semiconductor products. For these stresses,
instantaneous values, maximum values and minimum values must be taken into consideration.
In addition, it should be noted that since power devices or IC's including power devices have large self-heating value, the degree of
derating of junction temperature affects the reliability significantly.
• When using the products specified herein by either (i) combining other products or materials therewith or (ii) physically, chemically
or otherwise processing or treating the products, please duly consider all possible risks that may result from all such uses in advance
and proceed therewith at your own responsibility.
• Anti radioactive ray design is not considered for the products listed herein.
• Sanken assumes no responsibility for any troubles, such as dropping products caused during transportation out of Sanken's distribu-
tion network.
• The contents in this document must not be transcribed or copied without Sanken's written consent.
28610.23, Rev. 1
18
SANKEN ELECTRIC CO., LTD.
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