SI7300A Sanken Electric Co., SI7300A Datasheet - Page 4

• Manufacturer Part Number: SI7300A
• Description: Unipolar Driver ICs
• Manufacturer: Sanken Electric Co.

32
Application Note
The procedures for the thermal design of the SI-7300A are
as follows:
(1) As shown in the right figure, the supply current I
(2) From the above measurements, the internal power dis-
(3) The heatsink area corresponding to the ambient tem-
(4) Verify that the temperature of the aluminum base plate
*
SI-7300A and SI-7330A
Thermal design
the output current lo are measured at the maximum
level of the supply voltage V
in holding mode at the 2-phase excitation.
sipation (2 phases) of the hybrid IC can be obtained
through the following formula.
Shown in the lower graphs are sample calculations of
Pdiss vs. Io.
perature can be obtained from the SI-7300A derating
curve shown in the lower right.
of the hybrid IC or adjacent heatsinks is below 85 C
(equivalent to max. ambient temperature) when operat-
ing under actual conditions.
For details on thermal design, refer to the technical
data.
SI-7300A Heat dissipation per phase
vs. output current
SI-7330A Heat dissipation per phase
vs. output current
16
14
12
10
Pdiss = V
Where R
8
6
4
2
0
9
8
7
6
5
4
3
2
1
0
0
0
0.5
0.2 0.4 0.6 0.8 1.0 1.2 1.4
Output current Io (A/ )
Output current Io (A/ )
1.0
L
CC1
: coil resistance of the motor per phase
1.5
• I
2.0
CC1
VCC1
Motor
3.6 /
No load
Excitation signal
1-phase, holding
mode
Condition
V
1-phase, holding
mode
Motor
Rm=0.85 /
Lm=1.45mH/
2.5
CC2
– 2Io
=5V
3.0
1 40V
2 30V
3 20V
9.0mH/
1
CC1
2
(R
3.5
3
2
. However, the motor is
L
+ R
S
)
SI-7300A Derating curve
CC1
28
24
20
16
12
8
4
0
and
0
Ambient temperature Ta (°C)
20
(Active low)
signal input
Excitation
40
SI-7300A
Aluminium heatsink
Using silicone grease
Unit : mm
Method for measuring current SI-7300A
(Open collector)
V
TD62302P
PD
CC2
(Toshiba)
60
+
2.2 F
10V
1
2
3
4
80
9
8
16
15
14
13
10k
SI-7330A Derating curve
510
2SC2002
30
25
20
15
10
Rx
5
0
4
0
A
B
A
B
Ambient temperature Ta (°C)
4
10
6
12
2
18 16 3 13
1
SI-7300A
20
14
A
R
SA
I
CC1
15
17
11
R
8
5
7
9
SB
40
A
I
ZD
O
SI-7300A
Aluminium heatsink
Using silicone grease
Unit : mm
A
B
60
A
B
+
100 F
50V
SPM
V
CC1
80