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參數資料
| 型號： | GFU |
| 廠商： | 意法半導體 |
| 英文描述： | Switch-Mode Driver for DC Motors(用于直流電機的開關模式驅動器) |
| 中文描述： | 開關模式直流電動機的驅動程序（用于直流電機的開關模式驅動器） |
| 文件頁數： | 9/12頁 |
| 文件大小： | 161K |
| 代理商： | GFU |
It is possible to verify that the L292 works in "closed-
loop" conditions during the entire motor current
rise-time: the voltage at pin 7 inverting input of the
error amplifier) is locked to the reference voltage
V
R
, present at the non-inverting input of the same
amplifier.
The previous linear analysis is correct for this ex-
ample.
Descresing the
ξ
value, the rise-time of the current
decreases. But for a good stability, from relationship
(6), the maximum value of
ξ
is:
CLOSED LOOP SYSTEM BANDWIDTH.
A good choice for x is the value 1 /
√
2. In this case :
I
M
V
I
(
s
)
=
0.044
R
s
1
+
s R
F
C
F
1
+
2s R
F
C
F
+
2s
2
R
F
2
C
F
2
The module of the transfer function is :
|
I
M
V
I
|
=
0.044
R
s
2
√
1
+
ω
2
R
F
2
C
F
2
√
[
(
1
+
2
ω
R
F
C
F
)
1
]
[
1
2
ω
R
F
C
F
)
+
The cutoff frequency is derived by the expression (9) by putting | I
M
which :
V
I
|
=
0.707
0.044
R
s
(
3 dB
)
, from
ω
T
=
0.9
R
F
C
F
f
T
=
0.9
2
π
R
F
C
F
ξ
min
=
1
2
4
√
2
(phase margin = 45
°
)
b) Large signal reponse
The large step signal response is limited by slew-
rate and inductive load.
In this case, during the rise-time of the motor
current, The L292 works is open-loop condition.
(8)
(9)
9/12
L292
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