Sanken Electric Co SI-7115B Datasheet
Unipolar Driver ICs
SI-7115B
■ Characteristics
Parameter Absolute maximum rating Electrical characteristics Phase switching signal input
Applied Output Junction Operating Storage Supply Output Input
voltage current temperature ambient temperature voltage current current
temperature Vcc(V) Io(A) Iin(mA) f (kHz) current voltage current voltage
Type No. Vsurge(V) Io(A/ø) Tj(°C) Top(°C) Tstg(°C) min typ max min max min max min max (A/ø) (V)min (mA)min (V)max
SI-7115B 40 1.7 125 –20 to +80 –30 to +100 20 24 30 0.2 1.5 5.0 19 24
Oscillation
frequency
Output Input Input Input
ON OFF
0.2 2.7 1.0
0.5 3.1 1.2
1.0 3.6 1.4
1.5 4.5 2.0
(Ta = 25°C)
■ Block diagram
CC
V
Rx
Output current fine
adjustment resistor
Reference
voltage
Excitation signal (4-phase)
Oscillator
circuit
Comparator
amplifier
Current
controller
Counter EMF
canceller
Excitation signal
amplifier
M
Current detection
resistor
0.8
SI-7115B
■ Equivalent circuit diagram ■ External connection diagram
18
CC
1
6
9
7
10
8
11
1
4
3
Q
D
4
D
1
D
3
Q
3
Q
4
R
S1
+
–
circuit
Oscillator
Q
2
D
5
D
2
D
6
Q
5
Q
R
S2
+
–
17
14
16
13
15
6
12
5
2
Excitation
signal
input
Active
High
µ
F
2.2
10V
A
B
A
B
+
–
Rx
8
13
10
15
1
2
a
4
5
b
3
V
18
SI-7115B
11 12
17
6
7
9
14
16
Stepper motor
A
A
B
B
33
SI-7115B
■ External dimensions
Dimensions of SI-7115B pins
11.5±1
4
0.4
4.0
11.5±1
Plastic package
39.6±0.5
0.5
123 18
71.7±0.5
60.3±0.4
Type No.
Lot No.
43.2
P=2.54
Application Note
■ Determining the output current Io (motor coil current)
The output current Io can be set to any value by connecting
an external resistor RX 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.
(Unit: mm)
9.0±0.6
Aluminum
φ
3.4
8.0
Fig. A SI-7115B External resistor vs. Output current
1.5
φ
(A/ )
O
1.0
plate
Output current IO
Output current IO RX
0.31 to 0.39 (A/ø) 200 (Ω)
0.95 to 1.05 (A/ø) 1.4 (kΩ)
Condition VCC = 24V, Ta = 25°C
2-phase excitation
Holding mode
Motor: 23PM-C109
0.5
Output current I
0
034
V
CC
R
t
Motor : 23PM-C109
External resistor Rx (kΩ)
Fig. B SI-711B Supply voltage vs. Output current Fig. C SI-7511B Output current vs. Temperature
1.5
φ
1.0
(A/ )
O
0.5
Output current I
Motor : 103G-775-1240
V
CC
= 24V
Ω
RX = 1.4k
Ω
RX = 560
1.5
φ
(A/ )
1.0
O
0.5
Output current I
Motor : 23PM-C109
Rx
Ω
3.9k
Ω
2k
Ω
1k
600Ω
300Ω
100Ω
24(V)
3.6(Ω)
34
0
0 202224262830
Supply voltage VCC (V)
0
0 10080604020
Case (aluminium base plate) temperature Tc (°C)
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