參數(shù)資料
型號(hào)： PW-82520R1-420
英文描述： Industrial Control IC
中文描述： 工業(yè)控制IC
文件頁數(shù)： 13/16頁
文件大小： 191K
代理商： PW-82520R1-420
13
Data Device Corporation
www.ddc-web.com
PW-82520/21N
A-11/01-1000
PW-82520/21N POWER DISSIPATION
There are two major contributors to power dissipation in the motor driver:
conduction losses, and switching losses.
An example calculation is shown below:
VBUS = +28 V (Bus Voltage)
I
OA
= 3 A, I
OB
= 7 A (see FIGURE 12)
f
PWM
= 25 KHz (switching frequency)
ton = 36 μs, T = 40 μs (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)
I
motor rms
= 4.87 amps
1.TRANSISTOR CONDUCTION LOSSES (P
T
)
P
T
= (Imotor rms)2x (Ron)
P
T
= (4.87)2x (0.055)
P
T
= 1.30 Watts
I
motor rms
=
I
OB
I
OA
+ (I
OB -
I
OA
)
3
2
(
)
ton
T
(
)
I
motor rms
=
7 x 3 + (73
2
(
)
36
40
(
)
T
I
OB
t
on
I
OA
VBUS
I
O
t
s2
t
s1
FIGURE 12. OUTPUT CHARACTERISTICS
2. SWITCHING LOSSES (P
S
)
Ps = [ VBUS ( I
OA
(ts1) + I
OB
(ts2) ) fo] / 2
Ps = [ 28 ( 3 (200 x10
-9
) + 7 (400 x10
-9
) ) 25x10
3
] / 2
Ps = 1.19 Watts
TRANSISTOR POWER DISSIPATION ( P
Q
)
Pq = P
T
+ P
S
Pq = 1.30 + 1.19 = 2.49 Watts
OUTPUT CONDUCTOR DISSIPATION
P
C
= (Imotor rms)
2
x (Rc)
P
C
= (4.87)
2
x (0.080)
P
C
= 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
P
TOTAL
= (Pq + Pc) x 2
P
TOTAL
= (2.49 + 1.90) x 2
P
TOTAL
= 8.78 Watts
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