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參數(shù)資料
| 型號： | PWR-82520R3-170 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 8 A, PDMA41 |
| 封裝： | HYBRID, DIP-41 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 187K |
| 代理商： | PWR-82520R3-170 |
13
Data Device Corporation
www.ddc-web.com
PWR-82520R
IOB
ton
IOA
VBUS
IO
ts2
ts1
FIGURE 12. OUTPUT CHARACTERISTICS
PWR-82520X 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)
fo = 50 KHz (switching frequency)
ton = 36 s, T = 40 s (90% duty cycle) (see FIGURE 12)
Ron = 0.055
(on-resistance, see TABLE 2)
Rc = 0.133
(conductor resistance, see TABLE 2)
ts1 = 125 ns, ts2 = 200 ns (see FIGURE 12)
1. TRANSISTOR CONDUCTION LOSSES (PT)
PT = (Imotor rms)2 x (Ron)
PT = (4.87)2 x (0.055)
PT = 1.30 Watts
(IOBIOA + (IOB - IOA)
2)( ton
T
)
3
Imotor rms =
(7 * 3 + (7 - 3)
2)( 36 )
3
Imotor rms =
40
2. SWITCHING LOSSES (PS)
Ps = [ VBUS ( 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)
PC = 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 DISSIPATION
PTOTAL = (Pq + Pc) x 2
PTOTAL = (2.54 + 3.15) x 2
PTOTAL = 11.38 Watts
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