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參數(shù)資料
| 型號： | PWR-82521-130L |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 18 A, DMA41 |
| 封裝： | DIP-41 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 150K |
| 代理商： | PWR-82521-130L |
9
June 1, 1999; Data Device Corp.
PWR-82521 POWER DISSIPATION (SEE FIGURE 11)
There are two major contributors to power dissipation in the
motor driver: conduction losses and switching losses.
VBUS = +28 V (Bus Voltage)
IoA = 3 A, IOB = 7 A (see FIGURE 11)
ton = 36 s, T = 40 s (period) (see FIGURE 11)
Ron = 0.055
(on-resistance, see TABLE 2)
Rc = 0.133
(conductor resistance, see TABLE 2,)
ts1 = 125 ns, ts2 = 200 ns (see FIGURE 11)
fo = 50 kHz (switching frequency)
1. Transistor Conduction Losses (PC)
PT = (Imotor rms)2 x (Ron)
PT = (4.87)2 x (0.055)
PT = 1.30 Watts
Continuous
Current
(Amps)
Case Temperature (
°C)
-60
-40
-20
0
20
40
60
80
100
120
140
28V,
Cont. Cur.
42V,
Cont. Cur.
70V,
Cont. Cur.
11
10
9
8
7
6
5
4
3
2
1
0
2. Switching Losses (Ps)
Ps = [ Vcc ( IOA (ts1) + IOB (ts2) ) fo] / 2
Ps = [ 28 V ( 3 A (125 ns) + 7 A (200 ns) ) 50 kHz] / 2
Ps = 1.24 Watts
TRANSISTOR POWER DISSIPATION ( PQ )
PQ = PT + Ps
PQ = 1.30 + 1.24 = 2.54 Watts
OUTPUT CONDUCTOR DISSIPATION
PC = (Imotor rms)2 x (Rc)
PC = (4.87)2 x (0.133)
P= 3.15 Watts
TRANSISTOR POWER DISSIPATION FOR CONTINUOUS
COMMUTATION
PQC = PQ (0.33)
PQC = (2.54) X (0.33)
PQC = 0.84 Watts
TOTAL HYBRID POWER DISIPATION
P
TOTAL = (PQ + PC) x 2
P
TOTAL = (2.54 +3.15) x 2
P
TOTAL = 11.38 Watts
IOB
ton
IOA
VBUS
IO
ts2
ts1
FIGURE 11. OUTPUT CHARACTERISTICS
FIGURE 10. MOTOR CURRENT DRIVE
(IOBIOA + (IOB - IOA)
2)( ton
T
)
3
Imotor rms =
(7 * 3 + (7 - 3)
2)( 36 )
3
Imotor rms =
40
Accuracy = ± 5% (of
rated output)
-10
-8
-6
-4
-2
0
2
4
6
8
10
-10
-5
0
5
10
Current
(Amps)
Input Command (Volt), Inductive Load
FIGURE 9. LINEARITY CURVE
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