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参数资料
| 型号： | PWR-82332-310 |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | AC MOTOR CONTROLLER, 25 A, DFM26 |
| 封装： | 3 X 2.3 INCH, 0.4 INCH HEIGHT, DFP-26 |
| 文件页数： | 13/16页 |
| 文件大小： | 360K |
| 代理商： | PWR-82332-310 |
6
PWR-82332 POWER DISSIPATION (see FIGURE 7)
There are three major contributors to power dissipation in the
motor driver: conduction losses, switching losses, and flyback
diode losses. Consider the following operating conditions
VCC= 120 V (Bus Voltage)
IOA = 10 A, IOB = 12 A
(see FIGURE 7)
ton = 30
s (see FIGURE 7); T = 40 s ( period )
Ron = 0.51
( on-resistance, Assume worst case,Tj = +150°C)
(see Figure 13)
ts1 = 600 ns; ts2 = 300 ns (see FIGURE 7)
fo = 25 kHz (switching frequency)
VF is the diode forward voltage, Io = 12 A, TC=+25°C
VF (avg)=0.95 V; IF is the diode forward current
1. Conduction Losses (PC)
PC = ( Imotor rms )
2 x Ron
PC = (9.54)
2 x (0.51 ) = 46.42 Watts
2. Switching Losses (PS)
PS = [VCC (IOA) (ts1) + IOB (ts2))fo] / 2
PS= [120 (10 (600 ns) + 12 (300ns)) 25kHz] / 2
PS = 14.4 Watts
3. Flyback diode Losses (Pd)
Pd = If (avg) x Vf (avg)
If (avg) = [( IOB + IOA ) / 2] / 2
= [(12 + 10 ) /2] / 2 = 5.5 A
Pd = 5.5 A x 0.95 V
Pd = 5.23 Watts
Transistor Power Dissipation (PT)
To calculate the maximum power dissipation of the output tran-
sistor / diode pair as a function of the case temperature, use the
following equation. (Reference FIGURE 14 to ensure you don’t
exceed the maximum allowable power dissipation of each tran-
sistor / diode pair.)
PT = PC + PS + Pd
In this example, PT = 46.42 + 14.4 + 5.23 = 66.05 Watts
Total Hybrid Power Dissipation (PHybrid)
To calculate Total Power Dissipated in the hybrid add
the power dissipation of each conducting transistor / diode pair.
Typically, only two transistor / diode pairs are conducting at any
given time.
PHASE CURRENT
LOWER TRANSISTOR
CURRENT
PHASE OUTPUT
VOLTAGE
I
V
I
t
T
OA
O
CC
OB
on
s2
s1
FIGURE 7. OUTPUT CHARACTERISTICS
I motor rms=
IOB - IOB (IOB - IOA) +
(IOB - IOA)
ton
2
3
T
I motor rms=
12 - 12 (12 - 10) +
(12 - 10)
30
2
3
40
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