SANKEN SLA7026

SLA7027MU/SLA7024M/SLA7026M
2-Phase/1-2 Phase Excitation
2-Phase Stepper Motor Unipolar Driver ICs
■Absolute Maximum Ratings
Parameter
Symbol
Motor supply voltage
FET Drain-Source voltage
Control supply voltage
TTL input voltage
Reference voltage
Output current
VCC
V DSS
VS
VIN
VREF
IO
PD1
PD2
Tch
Tstg
Power dissipation
Channel temperature
Storage temperature
(Ta=25°C)
Ratings
SLA7024M
46
100
46
7
2
1.5
4.5 (Without Heatsink)
35 (TC=25°C)
+150
−40 to +150
SLA7027MU
1
Units
SLA7026M
V
V
V
V
V
A
W
W
°C
°C
3
■Electrical Characteristics
Parameter
Symbol
min
IS
Condition
Control supply voltage
VS
VDSS
FET Drain-Source voltage
Condition
VDS
FET ON voltage
Condition
IDSS
FET drain leakage current
Condition
VSD
FET diode forward voltage
Condition
IIH
Condition
TTL input current
IIL
Condition
V IH
TTL input voltage
Condition
(Active High)
VIL
Condition
V IH
TTL input voltage
Condition
(Active Low)
VIL
Condition
Tr
Condition
Tstg
Switching time
Condition
Tf
Condition
AC characteristics
DC characteristics
Control supply current
20
10
100
SLA7027MU/SLA7024M/SLA7026M
SLA7027MU
typ
10
VS =44V
24
max
15
min
44
10
100
VS =44V, IDSS=250 µA
Ratings
SLA7024M
typ
10
VS=44V
24
max
15
min
44
10
100
VS=44V, IDSS=250µA
0.85
4
4
1.2
1.1
40
2.3
ID=3A
40
VIH=2.4V, VS=44V
40
VIH =2.4V, VS =44V
−0.8
VIH=2.4V, VS=44V
−0.8
V IL=0.4V, VS =44V
−0.8
VIL=0.4V, VS=44V
V IL=0.4V, VS =44V
2
ID=1A
ID=3A
0.8
VDSS=100V
0.8
VDSS=100V
2
V
mA
V
µA
mA
V
VDSS=100V
2
VDSS=100V
V
2
ID=1A
0.8
2
VDSS=100V
0.8
ID=1A
0.5
VS=24V, ID=0.8A
0.7
VS=24V, ID=0.8A
0.1
VS=24V, ID=0.8A
4
V DSS=100V, VS =44V
ID=1A
mA
V
ID=3A, VS=14V
VDSS=100V, VS=44V
ID=1A
44
0.85
ID=1A, VS =14V
V DSS=100V, VS =44V
Units
max
15
VS =44V, IDSS=250 µA
0.6
ID=1A, AV S=14V
2
SLA7026M
typ
10
VS =44V
24
VDSS=100V
0.8
ID=1A
0.5
VS =24V, ID=1A
0.7
VS =24V, ID=1A
0.1
VS =24V, ID=1A
0.8
ID=3A
0.5
V S=24V, ID=1A
0.7
V S=24V, ID=1A
0.1
V S=24V, ID=1A
V
µs
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
SLA7027MU/SLA7024M/SLA7026M
12
Reg
Reg
17
16
18
IN B
7
VSB
5
VSA
6
IN A
1
IN A
8
IN B
■Internal Block Diagram
11
1, 8, 11, 18pin
Description of pins
2
3 14
13
1
8
11
18
input
Active L
OUTA
OUTA
OUT B
OUT B
RSB
GB
TDB
REFB
4
Pin
Pin
Pin
Pin
+
–
+
–
REFA
9
+
–
TDA
GA
RSA
+
–
Excitation
Active H
OUTA
OUTA
OUT B
OUT B
15
10
■Diagram of Standard External Circuit(Recommended Circuit Constants)
Active High
VCC (46V max)
Excitation signal time chart
2-phase excitation
+
Vb (5V)
r3
7 12
8
VSA VSB OUTA
11
OUTB
r1
r4
2
C1
1
18
OUTA OUTB
13
C2
TdA
TdB
INA
SLA7024M
7026M
7027MU
RSA REFA REFB RSB
9
3 14
10
r2
C3
INA
INB
INB
GB
15
GA
4
6
5
17
16
r6
0
H
L
H
L
1
L
H
H
L
2
L
H
L
H
3
H
L
L
H
0
H
L
H
L
r1 :
r2 :
r3 :
r4 :
r5 :
r6 :
C1 :
C2 :
C3 :
C4 :
Rs :
510Ω
100Ω (VR)
47kΩ
47kΩ
2.4kΩ
2.4kΩ
470pF
470pF
2200pF
2200pF
1Ω typ(7024M)
(1 to 2W) 0.68Ω typ(7026M)
1.8Ω typ(7027MU)
1
L
H
H
L
INA
INA
INB
Active
High
INB
1-2 phase excitation
clock
IN A
IN A
IN B
IN B
C4
r5
Rs
clock
IN A
IN A
IN B
IN B
Rs
0
H
L
L
L
1
H
L
H
L
2
L
L
H
L
3
L
H
H
L
4
L
H
L
L
5
L
H
L
H
6
L
L
L
H
7
H
L
L
H
0
H
L
L
L
1
H
L
H
L
2
L
L
H
L
3
L
H
H
L
Active Low
VCC (46V max)
Excitation signal time chart
2-phase excitation
+
Vb (5V)
r3
C1
7 12
8
1
18
VSA VSB OUTA OUTA OUTB
11
OUTB
r1
r4
C2
r2
2 TdA
TdB
13
C3
Rs
INA
SLA7024M
7026M
7027MU
RSA REFA REFB RSB
9
3 14
10
C4
r5
r6
Rs
clock
IN A
IN A
IN B
IN B
INA
INB
GA
4
INB
GB
15
6
5
17
16
0
L
H
L
H
1
H
L
L
H
2
H
L
H
L
3
L
H
H
L
0
L
H
L
H
r1
r2
r3
r4
r5
r6
C1
C2
C3
C4
Rs
510Ω
100Ω(VR)
47kΩ
47kΩ
2.4kΩ
2.4kΩ
470pF
470pF
2200pF
2200pF
1Ω typ(7024M)
(1 to 2W) 0.68Ω typ(7026M)
1.8Ω typ(7027MU)
1
H
L
L
H
INA
INA
INB
Active
Low
INB
1-2 phase excitation
clock
IN A
IN A
IN B
IN B
0
L
H
H
H
1
L
H
L
H
2
H
H
L
H
3
H
L
L
H
4
H
L
H
H
5
H
L
H
L
6
H
H
H
L
7
L
H
H
L
0
L
H
H
H
1
L
H
L
H
2
H
H
L
H
:
:
:
:
:
:
:
:
:
:
:
3
H
L
L
H
SLA7027MU/SLA7024M/SLA7026M
21
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
SLA7027MU/SLA7024M/SLA7026M
■External Dimensions
+0.2
+0.2
0.65 –0.1
1 –0.1
17×P1.68±0.4=28.56±1
+0.2
+0.2
0.65 –0.1
1 –0.1
+0.2
0.55 –0.1
4±0.7
2.2±0.6
6±0.6
7.5±0.6
17×P1.68±0.4=28.56±1
31.3±0.2
1 2 3 · · · · · · · 18
Forming No. No.871
22
SLA7027MU/SLA7024M/SLA7026M
123 · · · · · · · 18
Forming No. No.872
+0.2
4.6 ±0.6
+1
(3)
R-End
3 ±0.6
2.45±0.2
0.55 –0.1
1.6 ±0.6
3.
4.
5.
Part No.
Lot No.
4.8±0.2
1.7±0.1
6.7±0.5
9.9 ±0.2
16 ±0.2
φ 3.2±0.15×3.8
9.7 –0.5
31±0.2
24.4±0.2
16.4±0.2
φ 3.2±0.15
13 ±0.2
(Unit: mm)
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
SLA7027MU/SLA7024M/SLA7026M
Application Notes
■Determining the Output Current
Fig. 1 Waveform of coil current (Phase A excitation ON)
Fig. 1 shows the waveform of the output current (motor coil curIO
rent). The method of determining the peak value of the output
current (IO) based on this waveform is shown below.
(Parameters for determining the output current IO)
Phase A
0
Vb: Reference supply voltage
r1,r2: Voltage-divider resistors for the reference supply voltage
Phase A
RS: Current sense resistor
(1) Normal rotation mode
IO is determined as follows when current flows at the maximum
level during motor rotation. (See Fig.2.)
Vb ................................................................
r2
(1)
IO ≅
•
r1+r2 RS
Fig. 2 Normal mode
Vb(5V)
(2) Power down mode
r6
r1
The circuit in Fig.3 (rx and Tr) is added in order to decrease the
r5
3,(14)
coil current. IO is then determined as follows.
1
IOPD ≅
•
r1(r 2+rX)
1+
r2
V
b
.........................................................
(2)
RS
C3
9,(10)
r2 • rX
RS
Equation (2) can be modified to obtain equation to determine rx.
rX=
1
1
Vb
r1
R s • I OPD
−1
−
1
Fig. 3 Power down mode
r2
Vb(5V)
Fig. 4 and 5 show the graphs of equations (1) and (2) respectively.
r6
r5
r1
rX
Power down
signal
Fig. 4 Output current IO vs. Current sense resistor R S
C3
Tr
2.0
3
r2 · V b
r1+r2 RS
r1=510Ω
r2=100Ω
rx=∞
Vb=5V
IO=
2
1
0
1
2
3
4
Current sense resistor RS (Ω)
Output current IOPD (A)
Output current IO (A)
9,(10)
r2
Fig. 5 Output current IOPD vs. Variable current sense resistor rx
4
0
3,(14)
RS =0.5Ω
1.5
1
· Vb
r1(r2+rX) RS
1+
r2 · rX
r1=510Ω
r2=100Ω
Vb=5V
IOPD=
RS =0.8Ω
1.0
RS =1Ω
0.5
00
200
400
600
800
1000 1200
Variable current sense resistor rX (Ω)
(NOTE)
Ringing noise is produced in the current sense resistor RS when
However, when the values of these constants are increased,
the MOSFET is switched ON and OFF by chopping. This noise
is also generated in feedback signals from RS which may there-
the response from RS to the comparator becomes slow. Hence
the value of the output current IO is somewhat higher than the
fore cause the comparator to malfunction. To prevent chopping
calculated value.
malfunctions, r 5(r 6) and C3(C4) are added to act as a noise filter.
SLA7027MU/SLA7024M/SLA7026M
23
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
■Determining the chopper frequency
SLA7027MU/SLA7024M/SLA7026M
Fig. 6 Chopper frequency vs. Motor coil resistance
Determining T OFF
The SLA7000M series are self-excited choppers. The chopping
OFF time T OFF is fixed by r3/C1 and r4/C2 connected to terminal
60
Td.
50
TOFF≅−r3 • C1rn (1−
2
=−r4 • C2rn (1−
2
)
Vb
Vb
The circuit constants and the T OFF value shown below are recommended.
T OFF = 12µs at r3=47kΩ, C1=500pF, Vb=5V
40
30
VC
40
10
0
4V
25
V
30
35
40
10
20
30
40
50
VCC (V)
SLA7027MU/SLA7024M/SLA7026M
47kΩ
r4
500pF
C1 = C2 =
TOFF =12µs
RS =1Ω
Lm
=1~3ms
Rm
4
6
8 10 12 14 16
Motor coil resistance Rm (Ω)
30
Motor : 23LM-C202
VCC=24V
RS=1Ω
20
10
0
r3
■Chopper frequency vs. Output current
f (kHz)
f (kHz)
2
40
20
24
0
50
Motor : 23LM-C202
IO = 0.8A at VCC=24V
RS=1Ω
=2
10
50
30
C
=36
VCC
20
0
■Chopper frequency vs. Supply voltage
20
Chopping frequency f (kHz)
T OFF can be calculated using the following formula:
ON time TON (µ s)
15
0
0
0.2
0.4
0.6
IO (A)
0.8
1.0
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
SLA7027MU/SLA7024M/SLA7026M
■Thermal Design
(2) The power dissipation Pdiss is obtained using the following formula.
An outline of the method for calculating heat dissipation is shown be(1) Obtain the value of PH that corresponds to the motor coil current
2-phase excitation: Pdiss ≅ 2PH+0.015×VS (W)
3
PH+0.015×VS (W)
1-2 phase excitation: Pdiss ≅
2
(3) Obtain the temperature rise that corresponds to the calcu-
IO from Fig. 7 "Heat dissipation per phase PH vs. Output current IO."
lated value of Pdiss from Fig. 8 "Temperature rise."
low.
Fig. 7 Heat dissipation per phase P H vs. Output current IO
SLA7027MU
SLA7026M
4.0
Motor : 23LM-C202
Holding mode
V
24
V
15
0.4
0.2
0
0
0.2
0.4
0.6
0.8
2.0
Motor : 23PM-C503
Holding mode
1.0
0
0
1.0
15
V
V
36
=4
4V
V
0.6
3.0
C
=4
24
V
CC
VC
4V
0.8
V
1
36
Heat dissipation per phase PH (W)
Heat dissipation per phase PH (W)
1.2
1.0
2.0
Output current IO (A)
Output current IO (A)
3.0
Fig. 8 Temperature rise
150
1.0
∆T
0.8
100
V
36
0.6
VCC
V
=44
Motor : 23LM-C004
Holding mode
5V
24V
0.4
1
j
C
∆T
∆Tj–a
∆TC–a (°C)
Heat dissipation per phase PH (W)
1.2
SLA7024M
Natural cooling
Without heatsink
50
0.2
0
0
0.2
0.4
0.6
0.8
Output current IO (A)
0
1.0
0
1
2
3
Total Power (W)
4
5
Thermal characteristics
SLA7027MU
SLA7026M
50
Without heatsink
Natural cooling
30
25
20
TC ( 4 pin)
15
Motor : PH265-01B
Motor current IO=0.8A
Ta=25°C
VCC=24V, VS=24V
2-phase excitation
10
5
0
200
500
1K
Response frequency (pps)
Case temperature rise ∆TC–a (°C)
30
Case temperature rise ∆TC–a (°C)
Case temperature rise ∆TC–a (°C)
35
Without heatsink
Natural cooling
40
30
TC( 4 pin)
Motor : 23PM-C705
Motor current IO=1.5A
Ta=25°C
VCC=24V, VS=24V
2-phase excitation
20
10
0
100
500
1K
5K
Response frequency (pps)
SLA7024M
Without heatsink
Natural cooling
25
20
TC ( 4 pin)
15
Motor : PH265-01B
Motor current IO=0.8A
Ta=25°C
VCC=24V, VS=24V
2-phase excitation
10
5
0
200
500
1K
Response frequency (pps)
SLA7027MU/SLA7024M/SLA7026M
25
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
SLA7027MU/SLA7024M/SLA7026M
■Supply Voltage VCC vs. Supply Current ICC
SLA7027MU
SLA7026M
1.5
400
Motor : 23LM-C202
1-phase excitation
Holding mode
IO : Output current
300
200
IO=1A
100
0
Supply current ICC (A)
Supply current ICC (mA)
500
1.0
Motor : 23PM-C503
1-phase excitation
Holding mode
IO : Output current
IO=3A
0.5
IO=2A
0.4A
0.2A
0
10
20
30
40
IO=1A
50
0
0
10
20
30
40
50
Supply voltage VCC (V)
Supply voltage VCC (V)
SLA7024M
Supply current ICC (mA)
500
400
Motor : 23LM-C004
1-phase excitation
Holding mode
IO : Output current
300
200
IO=1A
100
0
0.5A
0.2A
0
10
20
30
40
50
Supply voltage VCC (V)
■Note
The excitation input signals of the SLA7027MU, SLA7024M and SLA7026M can be used as either Active High or Active Low. Note,
however, that the corresponding output (OUT) changes depending on the input (IN).
Active Low
Active High
26
Input
Corresponding output
Input
Corresponding output
INA (pin6)
OUTA (pin1)
INA (pin6)
OUTA (pin8)
INA (pin5)
OUTA (pin8)
INA (pin5)
OUTA (pin1)
INB (pin17)
OUTB (pin11)
INB (pin17)
OUTB (pin18)
INB (pin16)
OUTB (pin18)
INB (pin16)
OUTB (pin11)
SLA7027MU/SLA7024M/SLA7026M