2-Phase Stepper Motor Unipolar Driver IC (2-Phase/1-2 Phase Excitation)
SLA7032M/SLA7033M
sThermal
Design
An outline of the method for calculated heat dissipation is shown below.
(1) Obtain the value of P
H
that corresponds to the motor coil current I
O
from Fig. 6 "Heat dissipation per phase P
H
vs. Output current I
O
."
(2) The power dissipation P
diss
is obtained using the following formula.
2-phase excitation: P
diss
2P
H
+0.015×V
S
(W)
3
P
H
+0.015×V
S
(W)
1-2 phase excitation: P
diss
2
(3) Obtain the temperature rise that corresponds to the computed value of P
diss
from Fig. 7 "Temperature rise."
Fig. 6 Heat dissipation per phase P
H
vs. Output current I
O
SLA7032M
1.2
Heat dissipation per phase P
H
(W)
SLA7033M
4.0
Heat dissipation per phase P
H
(W)
1.0
0.8
0.6
0.4
0.2
0
=
44V
24V
1
3.0
=4
4
V
15
V
24
V
V
36
V
CC
1.0
0
0.2
0.4
0.6
0.8
Output current I
O
(A)
1.0
0
0
1.0
2.0
Output current I
O
(A)
36
V
Motor : 23LM-C004
Holding mode
5V
2.0
V
C
Motor : 23PM-C503
Holding mode
C
3.0
Fig. 7 Temperature rise
150
T
j
100
∆T
j–a
∆T
C–a
(°C)
C
T
Natural cooling
Without heatsink
50
0
0
1
2
3
Total Power (W)
4
5
Thermal characteristics
SLA7032M
30
SLA7033M
50
Case temperature rise
∆T
C–a
(°C)
25
20
Case temperature rise
∆T
C–a
(°C)
Without heatsink
Natural cooling
Without heatsink
Natural cooling
40
T
C
( 4 pin)
15
10
5
0
200
30
T
C
( 4 pin)
Motor : 23PM-C705
Motor current I
O
=1.5A
T
a
=25°C
V
CC
=24V, V
S
=24V
2-phase excitation
Motor : PH265-01B
Motor current I
O
=0.8A
T
a
=25°C
V
CC
=24V, V
S
=24V
2-phase excitation
20
10
500
1K
0
100
500
1K
5K
Response frequency
(pps)
Response frequency
(pps)
SLA7032M/SLA7033M
33
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