Unipolar Driver ICs
SI-7115B
s
Characteristics
Parameter
Applied
voltage
Type No.
Vsurge(V)
Absolute maximum rating
Output
current
Io(A/ø)
Junction
temperature
Tj(°C)
Electrical characteristics
Operating
Storage
Supply
Output
Input
ambient
temperature
voltage
current current
temperature
Vcc(V)
Io(A) Iin(mA)
Top(°C)
Tstg(°C)
min typ max min max min max
Oscillation
frequency Output
f (kHz) current
min max (A/ø)
0.2
SI-7115B
40
1.7
125
–20 to +80
–30 to +100
20 24 30 0.2 1.5
5.0 19 24
0.5
1.0
1.5
(Ta = 25°C)
Phase switching signal input
ON
OFF
Input
Input
Input
voltage current voltage
(V)min (mA)min (V)max
2.7
3.1
3.6
4.5
1.0
1.2
1.4
2.0
0.8
s
Block diagram
V
CC
Reference
voltage
Rx
Oscillator
circuit
Comparator
amplifier
Current
controller
M
Counter EMF
canceller
Output current fine
adjustment resistor
Excitation signal (4-phase)
Current detection
resistor
Excitation signal
amplifier
SI-7115B
s
Equivalent circuit diagram
18
Q
1
6
9
7
10
8
Q
3
R
S1
11
1
+
–
+
–
s
External connection diagram
Q
2
D
5
D
1
D
2
D
6
17
14
16
13
15
Q
4
Q
5
Q
6
R
S2
12
V
CC
D
4
D
3
18
Excitation
signal
input
Active
High
A
B
A
B
8
13
10
15
1
+
–
Rx
b
a
2
4
5
3 11
12
17
6
Stepper motor
µ
F
2.2
10V
SI-7115B
7
9
14
16
A
A
B
B
4
Oscillator
circuit
5
2
3
33
SI-7115B
s
External dimensions
Plastic package
Dimensions of SI-7115B pins
71.7±0.5
60.3±0.4
11.5±1
39.6±0.5
0.4
4.0
4
Type No.
Lot No.
9.0±0.6
(Unit: mm)
φ
3.4
8.0
Aluminum
plate
11.5±1
0.5
P=2.54
43.2
1 2 3
18
Application Note
s
Determining the output current Io (motor coil current)
The output current Io can be set to any value by connecting
an external resistor R
X
across pin 3 and all of pins 2, 4 and
5. Fig. A, B and C show the relationship between the
external resistor and the output current, the supply voltage
and the output current, and the output current and the
temperature, respectively.
Output current I
O
Output current I
O
0.31 to 0.39 (A/ø)
0.95 to 1.05 (A/ø)
R
X
200 (Ω)
1.4 (kΩ)
Condition V
CC
= 24V, Ta = 25°C
2-phase excitation
Holding mode
Motor: 23PM-C109
Fig. A SI-7115B External resistor vs. Output current
1.5
Output current I
O
(A/
φ
)
1.0
0.5
V
CC
24(V)
R
t
3.6(Ω)
Motor : 23PM-C109
0
0
3
4
External resistor Rx (kΩ)
Fig. B SI-711B Supply voltage vs. Output current
Fig. C SI-7511B Output current vs. Temperature
1.5
Motor : 103G-775-1240
V
CC
= 24V
1.5
Motor : 23PM-C109
Rx
3.9kΩ
Output current I
O
(A/
φ
)
2kΩ
Output current I
O
(A/
φ
)
R
X
= 1.4kΩ
1.0
1.0
1kΩ
R
X
= 560Ω
600Ω
0.5
300Ω
0.5
100Ω
0
0
20
22
24
26
28
30
0
0
20
40
60
80
100
Supply voltage V
CC
(V)
Case (aluminium base plate) temperature Tc (°C)
34
SI-7115B
Application Note
s
Power down mode
The SI-7115B can be operated in power down mode. The
circuit is shown below.
As shown in the figure,
Power down circuit
when the power down tran-
2
sistor is switched on, (Ry
4
is power down resistor)
R
Y
R
X
/R
Y
becomes a current
5
fixing resistance and the
R
X
SI-7115B
current during power down
mode can be obtained by
3
substituting this resistance
to R
X
in the previous Fig.
Power down Transistor T
R
A.
s
Thermal design
In SI-7115B, the avalanche diode of the phase-switching
transistor is operated in breakdown condition and the en-
ergy built up in the inductance of the motor coil is dissipated
as heat of the transistor. Hence, when the motor rotates,
the internal heat dissipation increases compared with when
the motor is stopped.
Therefore, the internal heat dissipation of 7115B can be
computed from the data taken with actual load through the
following procedures.
(1) Vary the rotation speed of the motor within the actual
operating range in a circuit under actual load conditions
and measure the supply current I
CC
and the correspond-
ing output current I
O1
and I
O2
.
Method for measuring current
(circuit under actual load conditions)
V
CC
A
15
Excitation
signals
A
B
A
B
8
13
10
15
1
has
e ex
cita
tion
s
Example of Frequency vs.
Torque characteristics
The following two graphs show the relationship between
frequency (pps) and pull-out torque (kg - cm) of SI-7115B
when used with two types of motor.
I
CC
I
O1
A
A
I
O2
Stepper motor
17
6
SI-7115B
2.0
Torque characteristics
2-p
SI-7115B
7
9
14
16
12
A
A
B
B
1-2 phase excitation
Pull-out torque (kg-cm)
µ
F
2.2
10V
+
–
Rx
a
2
4
5
3 11
b
1.0
Motor
103G–775–1240
V
CC
=24V
I
O
= 1.0A/
φ
0
50
100
500
1000
5000
(2) Obtain the internal power dissipation Pdiss (4-phase) of
7115B through the following formula.
Pdiss = V
CC
•I
CC
– (I
O1
2
+ I
O2
2
)•R
L
The figure below shows the relationship between frequency
(PPS) and I
CC
, Pdiss, and case temperature T
C
.
SI-7115B Frequency vs. Supply current, Internal power
dissipation and Case temperature (Example)
Frequency (PPS)
SI-7115B
5.0
Torque characteristics
2-phase excitation
Pull-out torque (kg-cm)
4.0
1-
2p
ha
se
2
20
100
I
CC
I
CC
Supply current
A
Pdiss = V
CC
• I
CC
V
CC
-R
L
(I
O12
+ I
O22
)
T
C
Temperature of heatsink
adjacent to SI-7115B
A
SI
7115B
I
01
M
A I
02
Motor : 23 PM-C109 no load
V
CC
= 24V
I
O
= 1.0A/
φ
2-phase excitation
Heatsink 100 x 100 x 2A
Ta = 25°C
ABAB
T
C
(°C)
I
CC
(A)
P
D
(W)
3.0
T
C
P
diss
ex
cit
ati
on
2.0
Supply current
Internal heat
dissipation
1.0
Motor KP6M2-001
V
CC
=24V
I
O
= 1.0A/
φ
Case temperature
1
10
50
max
I
CC
0
50
100
500
1000
5000
0
0
0
0
500
1000
1500
Frequency (PPS)
Frequency (PPS)
35
SI-7115B
Application Note
SI-7115B Derating curve
28
(3) Obtain the heatsink area corresponding to the ambient
temperature Ta from the derating curve.
(4) Verify that the temperature of the aluminum base plate
of 7115B or adjacent heatsinks is below 85°C (equiva-
lent to max. ambient temperature) when operating un-
der actual load conditions.
Internal power dissipation P
D
(W) (2-phase)
24
SI-7115B
Aluminum heatsink
Using silicone grease
Unit : mm
10
20
0
×
20
0
×
2(
3.4
16
10
0
×
°C
15
)
/W
0
×
2
12
10
0
×
10
0
×
2(4
.
(3
.75
°C
/W
)
7°C
/W
)
8
4
No he
atsink
0
0
20
40
60
80
Ambient temperature Ta (°C)
36
SI-7200M, SI-7230M, SI-7115B, SI-7300A,
SI-7330A, SI-7500A and SI-7502
Handling Precautions
(Note: The SI-7502 is applicable for item (2) only.)
For details, refer to the relevant product specifications.
(1) Tightening torque:
The torque to be applied in tightening screws when mounting the IC on a
heatsink should be below 49N•m.
(2) Solvent:
Do not use the following solvents:
Substances that
Chlorine-based solvents
: Trichloroethylene,
dissolve the package
Trichloroethane, etc.
Aromatic hydrogen compounds : Benzene, Toluene,
Xylene, etc.
Ketone and Acetone group solvents
Substances that
weaken the package
(3) Silicone grease:
The silicone grease to be used between the aluminum base plate of the hybrid
IC and the heatsink should be any of the following:
• G-746
• YG6260
• SC102
SHINETSU CHEMICAL INDUSTRIES CO., LTD.
TOSHIBA SILICONE CO., LTD.
DOW CORNING TORAY SILICONE CO., LTD.
Gasoline, Benzine and Kerosene
Please pay sufficient attention in selecting silicone grease since oil in some
grease may penetrate the product, which will result in an extremely short
product life.
Others
• Resistance against radiation
Resistance against radiation was not considered in the development of these ICs
because it is assumed that they will be used in ordinary environment.
54
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