SLA7020M Просмотр технического описания (PDF) - Sanken Electric co.,ltd.
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SLA7020M Datasheet PDF : 10 Pages
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SLA7024M, SLA7026M, SLA7027MU, SLA7022MU, SLA7029M,
SMA7022MU, SMA7029M, SLA7020M, SLA7021M and SDK03M
Application Note
s Determining the chopper frequency
Determining TOFF: SLA7000M series, SMA7000M series and
SDK03M are self-excited choppers. The chopping OFF
time TOFF is fixed by r3/C1 and r4/C2 connected to terminal
Td.
TOFF can be computed through the following formula:
TOFF =.. –r3•C1Rn(1–
2
)
Vb
=
–r4•C2Rn(1–
2
Vb
)
The circuit constants and the TOFF value shown below are
recommended.
TOFF = 12 µs
r3 = 47 KΩ
C1 = 500 pF
Vb = 5 V
Fig. 10 Chopper frequency vs. Motor coil resistance
60
r3
C1
=
r4
C2
=
47kΩ
500PF
15
50
TOFF =12µs
RS =1Ω
40
Lm
Rm
=1~3ms
20
30
20
VCVCC=C24=V36V
25
30
35
10
40
0
0 2 4 6 8 10 12 14 16
Motor coil resistance Rm (Ω)
s Thermal design
An outline on the method of computing heat dissipation is
shown below.
(1) Obtain the PH that corresponds to the motor coil current
IO from Fig. 11 “Heat dissipation per phase PH vs. Out-
put current lo”.
(2) The power dissipation Pdiss is obtained through the
following formula.
• SLA7000M and SMA7000M series
2-phase excitation : Pdiss =.. 2PH + 0.015 x Vs (W)
1-2
phase
excitation
:
Pdiss
.=.
3
2 PH
+
0.015
x
Vs
(W)
• SDK03M
2-phase excitation : Pdiss .=. PH + 0.015 x Vs (W)
1-2
phase
excitation
:
Pdiss
.=.
3
4 PH
+
0.015
x
Vs
(W)
(3) Obtain the temperature rise that corresponds to the
computed Pdiss from Fig. 12 “Temperature rise curve.”
Fig. 11 Heat dissipation per phase PH vs. Output current lo
1.2 SLA7024M, SLA7029M, SMA7029M and SLA7020M
Typ.
1.0
Motor : 23LM-C004
0.8
Holding mode
0.6
0.4
VCC =44V
24V
36V
15V
0.2
00
0.2
0.4
0.6
0.8
1.0
Output current IO (A)
SLA7026M and SLA7021M
4.0
Typ.
3.0
Motor : 23PM-C503
Rm=1.16 Ω/φ
Lm=2.9mA/φ
2.0
Holding mode
1.0
15V
24V
36V
0
0
1.0
2.0
3.0
Output current IO (A)
SLA7022MU, SLA7027MU, SMA7022MU and SDK03M
1.4
Typ.
1.2 Motor : 23LM-C202
Holding mode
1
0.8
VCC =443V6V
0.6
24V
15V
0.4
0.2
00
0.2
0.4
0.6
0.8
1
Output current IO (A)
19
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