參數(shù)資料
型號(hào): SI-7200M
廠商: SANKEN ELECTRIC CO LTD
元件分類: 運(yùn)動(dòng)控制電子
英文描述: Bipolar Driver IC
中文描述: STEPPER MOTOR CONTROLLER, 1.2 A, PSIP18
封裝: PLASTIC PACKAGE-18
文件頁(yè)數(shù): 4/5頁(yè)
文件大小: 52K
代理商: SI-7200M
49
SI-7200M
Application Note
I
Thermal design
Procedures for thermal design of SI-7200M are shown below.
(1) As shown in the figure below, the supply current I
CC
and the output
current I
O
are measured at the maximum level of the supply voltage
V
CC
. However, the motor is in holding mode at the 2-phase excitation.
(2) From the above measurements, the internal power dissipation (2-
phase) of the hybrid IC can be obtained through the following formula.
P
D
= V
CC
x I
CC
–2I
O
2
(R
L
+ R
S
)
Where R
L
: Resistance of the motor coil between pins 2 and 4 and pins
15 and 17
Shown in the lower graph is a sample calculation of P
D
vs. I
O
.
(3) The heatsink area corresponding to the ambient temperature can be
obtained from the SI-7200M derating curve shown in the right.
(4) Verify that the temperature of the aluminum base plate of the hybrid IC
or adjacent heatsink is below 85
°
C (equivalent to max. ambient tem-
perature) when operating under actual load conditions.
* For details on thermal design, refer to the tech-
nical data book
Method for measuring the SI-7200M current
V
CC
1
A
A
B
B
Excitation signal
(2-phase excitation)
Power down
A
A
B
B
SPM
V
CC-2
V
R
44k
V
R
300
1000pF
1k
4
7
2
6
5
555
3
Equiva-
lent
3.9k
1k
0.01 F
2SA561
7
6
12
13
9
10
IS1555
a
11
8
18
3
16
2
4
17
15
5
14
SI-7200M
R
SB
R
SA
a : Trigger pulse for controlling the output current
Pulse width : 2 s
Frequency : 20 kHz
8
A
A
I
O
I
CC
μ
SI-7200M
Derating curve
Ambient temperature Ta (°C)
D
40
20
0
60
80
16
14
12
10
8
6
4
2
0
SL-7200M
Aluminum heatsink
Using silicone grease
Unit : mm
10
×
0
×
51CW
100
×
50
×
2(65CW
Wthout heatsnk
SI-7200M Power dissipation vs. Output current
7
6
5
4
3
2
1
0
P
D
/
q
w
e
V
CC-1
q
40V
w
30V
e
20V
Motor
6V 5
/
14mH/
No load
0
0.2
0.4
0.6
0.8
1.0
Output current I
O
(A)
φ
φ
φ
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