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參數(shù)資料
| 型號(hào)： | L6246 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 12V VOICE COIL MOTOR DRIVER |
| 中文描述： | 12V的音圈電機(jī)驅(qū)動(dòng) |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 103K |
| 代理商： | L6246 |
If Now We Define:
#3
Aloop
=
A
CPW
A
CERR
A
CSENSE
R
S
R
S
+
Z
L
we obtain:
#4
I
L
V
IN
=
Aloop
A
CINP
A
CSENSE
1
1
+
A
loop
R
S
Atlowfrequencyis:
Aloop
=
32
R2
R1
10
R
S
(
R
S
+
Z
L
)
if R2 = 1M, R1 = 1K, R
S
= 0.2, R
L
= 7
thenAloop = 8889 = 80dB.
Being Aloop very high we can simplify the
#4
in
thisway:
I
L
V
IN
=
A
CINP
A
CSENSE
1
R
S
=
1
10
0.2
=
1
2
For the stability we have to study the stability of
Aloop, that as we can see from the
#3
is a multi-
plication,so in dB is a sum:
Aloop |
dB
= A
CPW
|
dB
+A
CERR
|
dB
+A
CSENSE
|
dB
+
R
S
R
S
+
Z
L
dB
So we can take in consideration the BODE dia-
grams of the each operational amplifier, with par-
ticular attentionto the Error amplifier.
1)The Power amplifier is actually composed by
two operational amplifiers in the way to have
a gain of +16 and -16 (in voltage) respec-
tevely,for a totalof 32 = 30dB.
The point at -3dB is around 130KHz.
2)The Sense amplifier has a gain of 20dB with
the point at -3dB around 210KHz.
3)The load introducean attenuationof:
20log
R
S
R
S
+
R
L
= -31dBwith R
S
= 0.2 and R
L
= 7
and its pole is at frequency
1
2
π
L
(
R
S
+
R
L
)
so around1KHz if
L = 1.2mH
.
So considering:
Ax |
dB
= Aloop|
dB
A
CERR
|
dB
A
CPW
|
dB
+ A
CSENSE
|
dB
+
R
S
R
S
+
R
L
dB
we have these Bode diagrams:
As can be easily see the bandwith is narrow and
the gain is low. It is possible to increase both
choosing an appropriate compensation of the Er-
ror amplifier.
The total bandwith should be, of course, at least a
decade lower of the 130KHz to avoid instability
problem. The bandwith guaranteed by the Error
amplifier has a Gmax of 80dB and a gain of 0dB
at 1MHz approximately, the real is some dB more
with a largerbandwith.
ACPW
30dB
130KHz
ACSENSE
20dB
210KHz
-31dB
LOAD
AX
19dB
1K
10K
100K
D95IN270A
L6246
9/12
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