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參數(shù)資料
| 型號(hào)： | PW-82520R3-240 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 3 A, DMA41 |
| 封裝： | DIP-41 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 219K |
| 代理商： | PW-82520R3-240 |
12
Data Device Corporation
www.ddc-web.com
PW-82520R
F-03/06-0
-50
-25
0
25
50
75
100
125
0
0.2
0.4
0.6
0.8
1.0
1.2
PW-82520R1
Amps
Case Temperature (C)
-50
-25
0
25
50
75
100
125
0.5
1.0
1.5
2.0
2.5
3.0
PW-82520R3
Amps
Case Temperature (C)
3.5
-50
-25
0
25
50
75
100
125
0
2
4
6
8
10
12
PW-82520R0
Amps
Case Temperature (C)
FIGURE 11. OUTPUT CURRENT FOR CONTINUOUS COMMUTATION (ELECTRICAL > 600RPM,
VBUS+ = 28V, PWM = 50KHZ)
PW-82520R0 POWER DISSIPATION
There are two major contributors to power dissipation in the motor driv-
er: conduction losses, and switching losses.
An example calculation is shown below:
VBUS = +28 V (Bus Voltage)
IOA = 3 A, IOB = 7 A (see FIGURE 12)
fPWM = 25 KHz (switching frequency)
ton = 36 s, T = 40 s (90% duty cycle) (see FIGURE 12)
Ron = 0.055
(on-resistance, see TABLE 2)
Rc = 0.080
(conductor resistance, see TABLE 2)
ts1 = tf = 200 ns, ts2 = 2tr = 400 ns (see TABLE 2, FIGURE 12)
Imotor rms= 4.87 amps
1. TRANSISTOR CONDUCTION LOSSES (PT)
PT = (Imotor rms)2 x (Ron)
PT = (4.87)2 x (0.055)
PT = 1.30 Watts
(7 * 3 + (7 - 3)
2)( 36 )
3
Imotor rms =
40
(IOBIOA + (IOB - IOA)
2)( ton
T
)
3
Imotor rms =
2. SWITCHING LOSSES (PS)
Ps = [ VBUS ( IOA (ts1) + IOB (ts2) ) fo] / 2
Ps = [ 28 ( 3 (200 x10-9) + 7 (400 x10-9) ) 25x103] / 2
Ps = 1.19 Watts
TRANSISTOR POWER DISSIPATION ( PQ )
Pq = PT + PS
Pq = 1.30 + 1.19 = 2.49 Watts
OUTPUT CONDUCTOR DISSIPATION
PC = (Imotor rms)2 x (Rc)
PC = (4.87)2 x (0.080)
PC = 1.90 Watts
3. TRANSISTOR POWER DISSIPATION FOR
CONTINUOUS COMMUTATION
(ELECTRICAL > 600RPM)
Pqc = Pq (0.33)
Pqc = (2.49) x (0.33)
Pqc = 0.82 Watts
4. TOTAL HYBRID POWER DISSIPATION
PTOTAL = (Pq + Pc) x 2
PTOTAL = (2.49 + 1.90) x 2
PTOTAL = 8.78 Watts
T
IOB
t on
IOA
VBUS
IO
ts2
ts1
FIGURE 12. OUTPUT CHARACTERISTICS
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