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參數(shù)資料
| 型號(hào)： | LX1711 |
| 廠商： | Microsemi Corporation |
| 英文描述： | CAP. AL. ELECT. 330UF 25V 20% |
| 中文描述： | 評(píng)估板 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 339K |
| 代理商： | LX1711 |
LXE1710 E
VALUATION
B
OARD
evaluation board is a second order, LC type filter as
shown below. Tradeoffs between performance and
component cost must be considered when determining
the complexity or type of filter selected.
OUT+
L
U
SER
G
UIDE
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
Copyright
2000
Rev. 1.1, 2000-12-01
OUT-
15μH
L
15μH
C
0.68μF
C
0.68μF
R
Its Laplace Transform function is:
ω
ω
ω
ω
Q
RC
Q
LC
S
S
C
S
LC
S
RC
S
C
S
=
=
+
+
=
+
+
=
1
Where
1
1
H(S)
2
2
2
The Class-D amplifier evaluation board design has a
pass-band of 20Hz to 20kHz to support the audio
frequency range and is configured to utilize a switching
or oscillator frequency f
s
= 500kHz. Depending on the
application, this oscillator frequency may be adjusted
(see section on Oscillator Configuration) to optimize
amplifier
performance
or
considerations such as EMI effects. Further
requirements of the filter are that the pass band
attenuation of switching frequency
f
s
should be lower
than 40dB and the corner frequency of the LC filter
should be set higher than 20kHz to avoid attenuating
audio signals in the desired audio band by more than
1dB. A speaker DC impedance o
50kHz corner frequency are defined for the evaluation
board.
The Q (selectivity factor or ratio of the center
frequency divided by the bandwidth) of the filter must
also be considered when designing a filter. Too high a
Q will result in a boost of the audio signal across the
audio band whereas a low Q will cause too much
attenuation of the signal. A Q value of 0.707 provides
modified
for
other
'-
C
=
the required audio response and is used in the
calculation below.
Q
R
C
π
ω
Board
Evaluation
in the
used
μF
68
.
=
μ
56
.
)
50000
)(
π
2
707
.
)
f
2
R
=
=
=
=
C
F
Q
C
To Compute the Inductor Value:
Board
Evaluation
in the
used
μH
15
μ
9
14
)
68
(.
)]
50000
)(
π
2
[(
1
)
f
2
1
1
2
2
2
=
=
=
=
=
L
H
C
C
L
C
π
ω
LXE1710 Evaluation Board
Frequency Response
-15
+15
+10
-12.5
-10
-7.5
-5
-2.5
+0
+2.5
+5
+7.5
+12.5
V
10
80
k
20
50
10
20
50
1k
2k
5k
10
k
20
k
50
k
Frequency (Hz)
Frequency response of the audio amplifier was
$
" )
,!
- $- + - -
"" ' .
!
- ,
) " +
)/ .
attenuation respectively. Therefore, to improve
frequency response performance for other loads, the
value of Q must be increased/decreased by changing
the capacitor. Since a different value C will affect the
corner frequency, values for L and C must be
recalculated. Below are recommended inductor and
capacitor values for 2
,
single stage LC filter design.
Capacitor C (μF)
1.0
0.68
0.47
Filter Component Values
Please note:
These recommended values are guidelines
for speaker loads. Actual speakers have varying
impedances, which may require revised filter calculations
and optimization. Furthermore, your application may have
different design goals than those chosen for the LX1710
evaluation board
.
–4dB
-
Inductor L (μH)
10
15
22
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