SLA7029 查看數據表（PDF） - Sanken Electric co.,ltd.
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SLA7029 Datasheet PDF : 7 Pages
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2-Phase Stepper Motor Unipolar Driver ICs (2-Phase Excitation)
SLA7022MU/SLA7029M/SMA7022MU/SMA7029M
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:
2
2
TOFF≅−r3 • C1rn (1−
=−r4 • C2rn (1− )
Vb
Vb
The circuit constants and the TOFF value shown below are rec-
ommended.
TOFF = 12µs at r3=47kΩ, C1=500pF, Vb=5V
Fig. 6 Chopper frequency vs. Motor coil resistance
60
15
50
40
20
r3
C1
=
r4
C2
=
47kΩ
500pF
30
20
VCC =24V
VCC =36V
TOFF =12µs
25 RS =1Ω
30
Lm
Rm
=1~3ms
35
40
10
0
0 2 4 6 8 10 12 14 16
Motor coil resistance Rm (Ω)
sChopper frequency vs. Supply voltage
50
40
30
Motor : 23LM-C202
IO = 0.8A at VCC=24V
20
RS=1Ω
10
0
0
10
20
30
40
50
VCC (V)
sChopper frequency vs. Output current
50
40
30
Motor : 23LM-C202
VCC=24V
RS=1Ω
20
10
0
0
0.2 0.4 0.6 0.8 1.0
IO (A)
SLA7022MU/SLA7029M/SMA7022MU/SMA7029M 9
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