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SLA7026 Arkusz danych(PDF) 5 Page - Sanken electric

Numer części SLA7026
Szczegółowy opis  2-Phase Stepper Motor Unipolar Driver ICs
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Producent  SANKEN [Sanken electric]
Strona internetowa  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

SLA7026 Arkusz danych(HTML) 5 Page - Sanken electric

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24
SLA7027MU/SLA7024M/SLA7026M
2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
SLA7027MU/SLA7024M/SLA7026M
Fig. 6 Chopper frequency vs. Motor coil resistance
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)
VC
C =24V
VCC
=36V
TOFF =12 s
RS =1
Lm
=1~3ms
Rm
=
=
r3
C1
r4
C2
47k
500pF
µ
sDetermining the chopper frequency
Determining TOFF
The SLA7000M series are self-excited choppers. 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
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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