43
SI-7500A
s
Ratings
Absolute
Supply voltage
Output
Junction
Operating
Storage
maximum
current
temperature
ambient
temperature
rating
(V)
(A)
(
C)
temperature (
C)
(
C)
Type No.
V
CC
V
b
Io
Tj
Top
Tstg
SI-7500A
40
8
1.2
+125
20 to +80
30 to +100
(Ta = 25
C)
(Ta = 25
C)
s
Characteristics
Electrical
Operating supply voltage
Output current
Power down
Vb input
External
*Input voltage
*Input
Trigger
Trigger
Trigger
charac-
Ratio
current
zener diode
current
pulse
pulse
pulse
teristics
breakdown
voltage
time
frequency
voltage
(V)
(mA/)
(%)
(mA)
(V)
(V)
(mA)
(V)
(
s)
(kHz)
V
CC
Vb
I
O
I
OPD
/I
O
Ib
V
Z
V
IH1
V
IH2
V
IL
I
IH1
I
IH2
Vtrig
Ttrig
Ftrig
Type No.
min
typ max min
typ max min typ max min typ max
max
min
max max max max max max
min max
min
typ
typ
max
SI-7500A
17
24
30
4.5
5
5.5 200 750 1000 35
50
100
15
V
CC
50
3.9
1.3
0.6
0.21 0.22
4.0
Vb
1.0
2.0
20
25
x1.5
s
Equivalent circuit diagram
s
Block diagram
* Input voltage and input current
conditions
V
IH1
: Vb = 5V, Q
1
to Q
5
ON
R
X
= , I
IN
= 0.2mA
V
IH2
: Vb = 5V, Q
1
to Q
5
OFF,
I
IN
= 0.22mA
I
IH1
: Vb = 5V, Q
1
to Q
5
ON,
V
IN
= 3.7V
I
IH2
: Vb = 5V, Q
1
to Q
5
OFF,
V
IN
= 0.9V
w
r i
t
o
!2 !5
!3
!6
!9
q
@0
u
!8
e
y
!0
!1
!7
!4
Q
6
R
6
R
1
D
1
Q
11
D
11
D
6
R
36
R
41
R
37
R
42
R
7
R
2
Q
7
Q
12
D
2
D
7
D
8
D
12
D
13
R
3
D
3
Q
13
R
8
Q
8
R
38
R
43
R
39
R
9
R
44
R
4
D
4
D
9
D
10
D
14
D
15
R
5
Q
9
R
10
Q
10
D
5
Q
15
R
45
R
40
MIC
3
R
15
Q
5
R
20
R
25
R
30
R
35
R
24
R
19
Q
4
R
14
R
34
R
29
R
23
R
18
R
28
Q
3
R
13
R
12
Q
2
R
22
R
17
R
27
R
32
MIC
1
R
16
R
21
R
26
R
31
R
47
Q
1
R
46
R
11
Q
14
Auxiliary power supply Vb
Reference
voltage
Comparator
amplifier
Excitation signal
amplifier
Trigger pulse
generator
circuit
Current
controller
Counter EMF
Canceller
SI-7500A
Variable current
resistor
Rx
Excitation signal
2-3 phase excitation
Current detection
resistor Rs
M
Main power
supply V
CC
Zener diode for
canceling counter EMF
ZD
5-phase Stepper Motor Star Connection Unipolar Driver IC
44
SI-7500A
s
Diagram of external circuits
s
External dimensions
(Unit: mm)
s
Supply voltage vs. Output current
s
Torque characteristics
SI-7500A
s
Case temperature vs. Output current
5-phase stepper motor
9
5
2
20
1
13
16
OUT-5
OUT-4
OUT-3
OUT-2
OUT-1
V
CC
ZD
7
18
Vb
Vief.
R
S5
R
S4
R
S3
R
S2
R
S1
GND
11
3
6
10
14
17
R
S1
R
S2
R
S3
R
S4
R
S5
R
S1
to R
S5
: Current detection resistor
R
X
: Variable current resistor
Excitation signal
input (Active High)
2-3 phase excitation
4
8
12
15
19
IN-1
IN-2
IN-3
IN-4
IN-5
SI-7500A
2SA561
1S1555
R
X
1k
3.9k
1k
4
8
3
7
2
6
5
555
1
0.01 F
Vb
V
R
44k
V
R
300
1000pF
ZD
100 F
50V
V
CC
Power down signal input
(Active high)
+
69.0
0.5
63.0
0.4
7.0
0.5
3.5
16.6
35.0
0.5
8.6
1
Type No.
Lot No.
8.0
3.4
1.8
3.8
3
P=2.54
12....................................20
Pin No.
0.5
1.4
Plastic package
(Typical value)
V
CC
=24V
Motor : PH566-B
1.0
0.8
0.6
0.4
0.2
0
0
25
50
75
100
Case temperature Tc (C)
Output current Io (A)
(Typical value,
Motor : PH566-B
Rs = 1
Vb = 5.0V
1.2
1.0
0.8
0.6
0.4
0.2
0
Supply voltage V
CC
(V)
Output current Io (A)
20
0
24
30
Rx =
2k
1k
510
200
100
2.5
2.0
1.5
1.0
0.5
0
Pull-out torque
OUT
(kg-cm)
0
0.1
0.2
0.5
1
5
Response frequency f (kpps)
10
20
Supply voltage V
CC
= 24V
Vb = 5V
Output current Io = 0.8 A/phase (fixed)
Counter EMF canceler Zener diode Vz = 49V
Motor : PH566B
2
45
SI-7500A
Application Note
s
Determining the output current I
O
(motor coil current)
The main elements that determine the output current are
Current detection resistor Rs, Supply voltage Vb, and Vari-
able current resistor R
X
.
(1) Normal mode
To operate a motor at maximum current level, set R
X
to
infinity (open).
From Fig. A, when the maximum output current ripple is
designated as I
OH
, its value will be,
V
RSH
I
OH
=
....................................................... [A]
R
S
V
RSH
can be computed as follows:
V
RSH
= 0.2 Vb + 0.213 (center value) .............. [B]
From equations [A] and [B], the output current I
OH
can
be computed as follows:
I
I
OH
=
(0.2 Vb + 0.213)
R
S
The relationship between I
OH
and R
S
is shown in Fig. B.
(2) Power down mode
When an external resistor R
X
is connected, V
RSH
changes
as shown in the Fig. B even when R
S
is retained. Obtain
the power down output current I
OHPD
from Fig. B and
equation [A].
s
Thermal design
Obtain the internal power dissipation that corresponds to the output current to be required from Fig. C, multiply this by three,
and determine the size of the heatsink from the derating curve in Fig. D. The derating curve is based on junction
temperature of 125
C. However, make some allowance so that Tc is 85
C or less and then select the proper heatsink size.
Fig. C SI-7500A Internal power dissipation per phase P
D
vs. Output current I
O
Fig. D SI-7500A Derating curve
Fig. B
V
RSH
M
a
x
.
(Vb = 5.0V)
V
RSH
Min
.
(Vb = 5.0V)
V
RSH
(max) = + 0.2 (V)
Vb + 0.1
4.69 +
1.92
Rx
V
RSH
(min) = + 0.15 (V)
Vb + 0.09
5.25 +
2.06
Rx
(Rx : k
)
V
RSH
(V)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
1
2
3
4
External resistor Rx (k
)
Waveform of output current
Fig. A
I
OH
Power dissipation per phase Pdiss/ (W)
Motor : PH566-B
Vb = 5V
Holding mode
V
CC
= 30V
24V
20V
6
5
4
3
2
1
0
0
0.2
0.4
0.6
0.8
1.0
1.2
Output current lo (A)
(Typical
value)
150
100
100
100
50
100
Without
heatsink
Power dissipation P
D
(W)
20
15
10
5
0
Heatsink : Aluminum
Thickness : 2 mm
0
20
40
60
80
Ambient temperature Ta (C)
54
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 49Nm.
(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
Gasoline, Benzine and Kerosene
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
SHINETSU CHEMICAL INDUSTRIES CO., LTD.
YG6260
TOSHIBA SILICONE CO., LTD.
SC102
DOW CORNING TORAY SILICONE CO., LTD.
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.
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