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SI-7330A 数据表(PDF) 3 Page - Sanken electric

部件名 SI-7330A
功能描述  Unipolar Driver ICs
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-7330A 数据表(HTML) 3 Page - Sanken electric

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31
SI-7300 and SI-7330A
Application Note
s Determining the output
current IO (motor coil current)
The output current, lo is fixed by the following circuit ele-
ments:
RS
:
Current detection resistor
VCC2 :
Supply voltage
RX
:
Variable current resistor
To operate a motor at maximum current level, set Rx =
infinity (open). Based on the specifications of SI-7300A, its
output current lo can be seen as:
lo (rms value): 535 to 625 mA
To compute lo when different values are used for Rs and
VCC2, use the approximation formula below. The maximum
ripple value IOH of the output current waveform can be
computed as follows:
1
lOH(max) =
(0.233•VCC2–0.026) [A]
RS
1
lOH(min) =
(0.214•VCC2–0.021) [A]
RS
The graph of this equation is shown below.
.
.
.
.
s Power down mode
The SI-7300A can be operated in power down mode. The
circuit is shown below. When transistor Tr is switched on,
the reference voltage drops and the output current can be
decreased.
Waveform of output current
IOH
Rx
Tr
2
SI-7300A
SI-7300A Pull-out torque
τout
vs. Response frequency
500
1000
5000
0
1
2
3
4
5
Motor
23PM-C108
VCC1=30V
IO=1.2A/
(Fixed)
2-phase excitation
VZ=60V
Response frequency f (pps)
φ
s Example of a Frequency vs.
Torque characteristic
The graph shows the relation-
ship between frequency and
pull-out torque of SI-7300A.
4
3
2
01
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
4
3
2
01
0
1
2
3
SI-7300A Output current IOH vs. Current detection resistor Rs
Current detection resistor Rs (
Ω)
SI-7330A Output current IOH vs. Current detection resistor Rs
max
V
CC2=5V
min
V
CC2=5V
IOH(max)
1
Rs
(0.233VCC2–0.026)
IOH(min)
1
Rs
(0.214VCC2–0.021)
Current detection resistor Rs (
Ω)
4
3
2
01
0
1
2
3
Variable current resistor Rx (k
Ω)
4
3
2
01
0
0.2
1.0
1.6
Variable current resistor Rx (k
Ω)
1.4
1.2
0.8
0.4
0.6
SI-7300A Output current IOH vs. Variable current resistor RX
max Rs
= 0.7
min
max Rs
= 1Ω
min
SI-7330A Output current IOH vs. Variable current resistor RX
Rs = 0.3
Rs = 0.8Ω
IOH(max) 1
Rs
1.131
4.843+ 4.9
Rx
VCC2 – 0.026
IOH(min)
1
Rs
1.107
5.165+ 5.1
Rx
VCC2 – 0.021
*Rx : kΩ


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