SLA7024 데이터 시트보기 (PDF) - Sanken Electric co.,ltd.
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SLA7024 Datasheet PDF : 7 Pages
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2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation)
SLA7027MU/SLA7024M/SLA7026M
sThermal Design
An outline of the method for calculating heat dissipation is shown be-
low.
(1) Obtain the value of PH that corresponds to the motor coil current
IO from Fig. 7 "Heat dissipation per phase PH vs. Output current IO."
Fig. 7 Heat dissipation per phase PH vs. Output current IO
SLA7027MU
1.2
1
0.8
=44V
0.6
VCC 36V
24V
Motor : 23LM-C202
Holding mode
15V
0.4
0.2
0
0
0.2
0.4
0.6
0.8
1.0
Output current IO (A)
SLA7024M
1.2
1.0
0.8
36V
0.6
VCC =44V
Motor : 23LM-C004
15V Holding mode
0.4
24V
0.2
0
0
0.2 0.4 0.6 0.8 1.0
Output current IO (A)
Thermal characteristics
SLA7027MU
35
30
25
Without heatsink
Natural cooling
20
TC ( 4 pin)
15
Motor : PH265-01B
Motor current IO=0.8A
10
Ta=25°C
VCC=24V, VS=24V
5
2-phase excitation
0
200
500
1K
Response frequency (pps)
SLA7024M
30
25
Without heatsink
Natural cooling
20
TC ( 4 pin)
15
Motor : PH265-01B
10
Motor current IO=0.8A
Ta=25°C
VCC=24V, VS=24V
5
2-phase excitation
0
200
500
1K
Response frequency (pps)
(2) The power dissipation Pdiss is obtained using the following formula.
2-phase excitation: Pdiss ≅ 2PH+0.015×VS (W)
1-2 phase excitation: Pdiss ≅
3
2
PH+0.015×VS (W)
(3) Obtain the temperature rise that corresponds to the calcu-
lated value of Pdiss from Fig. 8 "Temperature rise."
SLA7026M
4.0
3.0
Motor : 23PM-C503
2.0
Holding mode
1.0
0
0
1.0
2.0
3.0
Output current IO (A)
Fig. 8 Temperature rise
150
∆Tj
100
∆TC
Natural cooling
Without heatsink
50
0
0
1
2
3
4
5
Total Power (W)
SLA7026M
50
40
Without heatsink
Natural cooling
30
TC( 4 pin)
Motor : 23PM-C705
20
Motor current IO=1.5A
Ta=25°C
VCC=24V, VS=24V
10
2-phase excitation
0
100
500 1K
5K
Response frequency (pps)
SLA7027MU/SLA7024M/SLA7026M 25
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