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參數(shù)資料
| 型號： | TMPA420DS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 15W/Ch STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 15W/Ch立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 348K |
| 代理商： | TMPA420DS |
Preliminary
www.taimec.com.tw
/
www.class-d.com.tw
TMPA420DS
Rev.3.0 August 15, 2007
t
ai'mec
Note that R=Zin(internal resistance) + Rext(external resistance)
Also note that the input resistance of RINN/RINP/LINN/LINP is 15K ohms at
Gain0=Gain1=high. Please refer to DC
CHARACTERISTICS
for detail.
In the following diagram Rext=22k ohms, Zin=15k ohms and C=C1=0.47uF. Thus the
–
3db
frequency at the low frequency side is about 9Hz.
Copyright
2005,Tai-1 Microelectronics Corp.
9
C1
0.47uF
R
22k
C1
0.47uF
Zin
15k
R
22k
Zin
15k
Class-D amplifier
Rinp
Rinn
C2
0.47nF
C1
0.47uF
R
22k
C1
0.47uF
Zin
15k
R
22k
Zin
15k
Linp
Linn
C2
0.47nF
right channel
leftchannel
A bypass capacitor placed in between the positive signal path and negative signal path is to
attenuate the high frequencies. It defines the
–
3bd frequency at the high frequency side. The
input filter becomes a band pass filter.
The
–
3db frequency of the high frequency side is
f
–
3db=1/(2
π
RC)
where C is the bypass capacitance and R is the total resistance in parallel with C.
In this example Rext=22k ohms, Zin=15k ohms and C=C2=0.47nF. Thus the
–
3db frequency
at the high frequency side is about 19kHz.
Output filter
Ferrite bead filter can be used for EMI purpose. The ferrite filter reduces EMI around 1 MHz
and higher
（
FCC and CE only test radiated emissions greater than 30 MHz
）
. When selecting a
ferrite bead, choose one with high impedance at high frequencies, but low impedance at low
frequencies.
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