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參數(shù)資料
| 型號(hào)： | SDV1005-600 |
| 英文描述： | 600W RMS,Class D Audio Amplifier Module(600W RMS,D級音頻放大器模塊) |
| 中文描述： | 600W額定功率，D類音頻放大器模塊（600W額定功率，?級音頻放大器模塊） |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 121K |
| 代理商： | SDV1005-600 |
Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for
the use of information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by
implication or otherwise under any patent or patent right of Semelab Plc.
Maximum
theoretical output power
at 20V = 70Wrms.
Then, the
Inherent Efficiency
of the amplifier module is 90%.
In practice, the quality of the amplifier terminations can affect the
Inherent Efficiency,
for maximum
efficiency the power connections (Rail voltage, Output terminals and the power ground) should be made
with soldered connections. If losses in the wiring to the load are minimised
Inherent Efficiencies
of 95% are
achievable.
Filter Attenuation
The direct output from the amplifier module is a
pulse width modulated signal. The underlying audio
signal has been mixed inside the amplifier with a
switching frequency at 245KHz. It is possible to
connect the amplifier output directly to a loudspeaker
and produce acceptable performance. However, if the
speaker is remote from the amplifier or sensitive high
frequency tweeters are being used it is advisable to
filter out the switching frequency.
Design of a high efficiency, flat passband filter
with maximum attenuation of the switching frequency
is not trivial. Hence, the audio amplifier output filter
requirements are minimum attenuation and distortion
in the passband from 20Hz to 20KHz. Thereafter
maximum attenuation at the switching frequency. The
load for the filter is a 4
loudspeaker which could
vary dynamically from 1
to 8
. If a simple LC
lowpass filter is used to minimise the attenuation in the
audio band of frequencies, the attenuation of the
modulation fundamental frequency will be typically
25dB. In addition, any gain peaking introduced by the
simple filter will distort the upper frequency ranges of
the audio band and introduce instabilities. In some
applications this simple filter could be acceptable,
However, for more demanding applications Semelab
plc have developed and patented a filter for use with
the
amplifier
that
provides
attenuation
of
the
switching
providing a flat audio passband with less than 0.5dB
attenuation. For more details of alternative filter
combinations contact Semelab plc.
greater
frequency,
than
40dB
whilst
Measured power = (38/2)
2
/(4 *
√
2) or 64Wrms
From the chart above:
Simple LC filter withgainpeak
-60.00
-50.00
-40.00
-30.00
-20.00
-10.00
0.00
10.00
20.00
30.00
1,000
10,000
100,000
1,000,000
Frequency (Hz)
T
L
C
L
C
SDV1005-600
POWER AMPLIFIER
MODULE
OUT1
OUT2
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