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SMA7022MU 数据表(PDF) 5 Page - Sanken electric

部件名 SMA7022MU
功能描述  2-Phase Stepper Motor Unipolar Driver ICs
Download  7 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

SMA7022MU 数据表(HTML) 5 Page - Sanken electric

  SMA7022MU Datasheet HTML 1Page - Sanken electric SMA7022MU Datasheet HTML 2Page - Sanken electric SMA7022MU Datasheet HTML 3Page - Sanken electric SMA7022MU Datasheet HTML 4Page - Sanken electric SMA7022MU Datasheet HTML 5Page - Sanken electric SMA7022MU Datasheet HTML 6Page - Sanken electric SMA7022MU Datasheet HTML 7Page - Sanken electric  
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9
SLA7022MU/SLA7029M/SMA7022MU/SMA7029M
SLA7022MU/SLA7029M/SMA7022MU/SMA7029M
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase Excitation)
sDetermining the chopper frequency
Determining TOFF
The SLA7000M and SMA7000M series are self-excited chop-
pers. The chopping OFF time TOFF is fixed by r3/C1 and r4/C2
connected to terminal Td.
TOFF can be calculated using the following formula:
The circuit constants and the TOFF value shown below are rec-
ommended.
TOFF = 12
µs at r3=47kΩ, C1=500pF, Vb=5V
60
50
40
30
20
10
0
0
2
4
6
8
10 12
14
16
15
20
25
30
35
40
Motor coil resistance Rm (
Ω)
VCC
=2
4V
VCC
=36V
TOFF =12 s
RS =1
Lm
=1~3ms
Rm
=
=
r3
C1
r4
C2
47k
500pF
µ
Fig. 6 Chopper frequency vs. Motor coil resistance
sChopper frequency vs. Supply voltage
0
VCC (V)
50
40
30
20
10
0
10
20
30
40
50
Motor : 23LM-C202
IO = 0.8A at VCC=24V
RS=1
sChopper frequency vs. Output current
0
IO (A)
50
40
30
20
10
0
0.2
0.4
0.6
0.8
1.0
Motor : 23LM-C202
VCC=24V
RS=1
TOFF
≅−r3 • C1 n (1−
=
−r4 • C2 n (1−
)
rr
2
Vb
2
Vb


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