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参数资料
| 型号： | PWR-82333-320L |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 50 A, DMA26 |
| 文件页数： | 17/17页 |
| 文件大小： | 631K |
| 代理商： | PWR-82333-320L |
9
Data Device Corporation
www.ddc-web.com
PWR-82331 and PWR-82333
P-02/05-0
PWR-82331 POWER DISSIPATION (SEE FIGURE 11)
There are three major contributors to power dissipation in the
motor driver: conduction losses, switching losses, and flyback
diode losses.
VCC = +140 V (Bus Voltage)
IOA = 20 A (See FIGURE 11); IOB = 30 A; (See FIGURE 11)
ton = 20 s (See FIGURE 11); T= 40 s (period)
Ron = 0.1
(on-resistance see TABLE 2, IO = 30 A,TC = +25° C)
ts1 = 250 ns (see FIGURE 11); ts2 = 250 ns (see FIGURE 11)
fo = 25 kHz (switching frequency)
VF is the diode forward voltage, Table 2, IO = 30 A, TC= +25° C
VF(avg) = +1.15 V; IF is the diode forward current
1. Conduction Losses (PC)
Pc = (Imotor rms)2 x Ron
Pc = (17.80 A)2 x (0.1
)
Pc = 31.68 Watts
2. Switching Losses (Ps)
Ps = [Vcc (IOA (ts1) + IOB (ts2)) fo] /2
Ps = [140 (20 (250 ns) + 30(250 ns))25k]/2
Ps = 21.88 Watts
3. Flyback Diode Losses (Pdf)
Pdf = IF (avg) x VF (avg)
IF (avg) = [(IOB + IOA) /2] /2 = [(30 + 20)/2]/2 = 12.5 A
Pdf = 12.5 A x 1.15 V
Pdf = 14.38 Watts
Transistor Power Dissipation (PQ)
To calculate the maximum power dissipation of the output tran-
sistor as a function of the case temperature use the following
equation. (Reference FIGURE 20 to ensure you don’t exceed the
maximum allowable power dissipation of each transistor.)
PQ = PC + PS
Total Hybrid Power Dissipation (PTOTAL)
To calculate Total Power dissipated in the hybrid use:
6
P
TOTAL =
Σ [PQi + Pdfi] where i = each transistor or diode.
i = 1
FIGURE 11. OUTPUT CHARACTERISTICS
PWR-82333 POWER DISSIPATION (SEE FIGURE 11)
There are three major contributors to power dissipation in the
motor driver: conduction losses, switching losses, and flyback
diode losses.
VCC = + 270 V (Bus Voltage)
IOA = 20 A (See FIGURE 11); IOB = 30 A; (See FIGURE 11)
ton = 50 s (See FIGURE 11); T=100 s (period)
VCE(SAT) = 3.8 V (see TABLE 2, IO = 30 A,TC= +25° C)
ts1 = 300 ns (see FIGURE 11); ts2 = 300 ns (see FIGURE 11)
fo = 10 kHz (switching frequency)
VF is the diode forward voltage, TABLE 2, IO = 30 A, TC= +25° C
VF (avg) = +1.70 V; IF is the diode forward current
1. Conduction Losses (PC)
Pc = (Imotor rms) x VCE(SAT)
Pc = (17.80 A) x (3.8 V)
Pc = 67.64 Watts
2. Switching Losses (Ps)
Ps = [Vcc (IOA (ts1) + IOB (ts2)) fo] /2
Ps = [ 270 (20 (300 ns) + 30 (300 ns))10k]/2
Ps = 20.25 Watts
3. Flyback Diode Losses (Pdf)
Pdf = IF (avg) x VF (avg)
IF (avg) = [(IOB + IOA) /2] /2 = [(30 + 20)/2] /2 = 12.5 A
Pdf = 12 5 A x 1.70 V
Pdf = 21.25 Watts
Transistor Power Dissipation (PQ)
To calculate the maximum power dissipation of the output tran-
sistor as a function of the case temperature use the following
equation. (Reference FIGURE 20 to ensure you don’t exceed the
maximum allowable power dissipation of each transistor.)
PQ = PC + PS
Total Hybrid Power Dissipation (PTOTAL)
To calculate Total Power dissipated in the hybrid use:
6
P
TOTAL =
Σ [PQi + Pdfi] where i = each transistor or diode.
i = 1
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