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SI-7200M 数据表(PDF) 4 Page - Sanken electric

部件名 SI-7200M
功能描述  Bipolar Driver IC
Download  5 Pages
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制造商  SANKEN [Sanken electric]
网页  http://www.sanken-ele.co.jp/en
标志 SANKEN - Sanken electric

SI-7200M 数据表(HTML) 4 Page - Sanken electric

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49
SI-7200M
Application Note
s Thermal design
Procedures for thermal design of SI-7200M are shown below.
(1) As shown in the figure below, the supply current ICC and the output
current IO are measured at the maximum level of the supply voltage
VCC. 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.
PD = VCC x ICC –2IO2 (RL + RS)
Where RL: 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 PD vs. IO.
(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
VCC1
A
A
B
B
Excitation signal
(2-phase excitation)
Power down
A
A
B
B
SPM
VCC-2
VR44k
VR 300
1000pF
1k
4
72
6
5
555
3
Equiva-
lent
3.9k
1k
0.01 F
µ
2SA561
7
6
12
13
9
10
IS1555
a
11
8
18
316
2
4
17
15
5
14
SI-7200M
RSB
RSA
a : Trigger pulse for controlling the output current
Pulse width : 2 s
Frequency : 20 kHz
8
A
A
IO
ICC
µ
SI-7200M
Derating curve
Ambient temperature Ta (°C)
40
20
060
80
16
14
12
10
8
6
4
2
0
SL-7200M
Aluminum heatsink
Using silicone grease
Unit : mm
100
×
50
×
2
(6.5°C/W)
Without
heatsink
SI-7200M Power dissipation vs. Output current
7
6
5
4
3
2
1
0
q
w
e
VCC-1 q 40V
w 30V
e 20V
Motor
6V 5
Ω/
14mH/
No load
0
0.2
0.4
0.6
0.8
1.0
Output current IO (A)
φ
φ


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