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參數(shù)資料
| 型號： | TDA8920TH/N1,118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 80 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | PLASTIC, SOT-566-3, HSOP-24 |
| 文件頁數(shù)： | 35/36頁 |
| 文件大?。?/td> | 733K |
| 代理商： | TDA8920TH/N1,118 |
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2002 Sep 25
8
Philips Semiconductors
Product specication
2
× 80 W class-D power amplier
TDA8920
handbook, full pagewidth
audio
operating
mute
standby
4 V
2 V
0 V (SGND)
time
Vmode
100 ms
>50 ms
switching
audio
operating
standby
4 V
0 V (SGND)
time
MBL465
Vmode
100 ms
50 ms
switching
Fig.4 Timing on mode select input.
When switching from standby
to operating there is a first
delay of 100 ms before the
outputs starts switching. The
audio signal is available after
a second delay of 50 ms.
When switching from standby
to mute there is a delay of
100 ms before the output
starts switching. The audio
signal is available after the
mode pin has been set to
operating, but not earlier than
150 ms after switching to
mute.
8.2
Pulse width modulation frequency
The output signal of the amplifier is a PWM signal with a
carrier frequency of approximately 350 kHz. Using a
2nd-order LC demodulation filter in the application results
in an analog audio signal across the loudspeaker. This
switching frequency is fixed by an external resistor ROSC
connected between pin OSC and VSSA. With the resistor
value given in the schematic diagram of the reference
design, the carrier frequency is typical 350 kHz. The
carrier frequency can be calculated using the following
equation:
If two or more class-D amplifiers are used in the same
audio application, it is advisable to have all devices
operating at the same switching frequency.
This can be realized by connecting all OSC pins together
and feed them from a external central oscillator. Using an
external oscillator it is necessary to force the OSC pin to a
DC-level above SGND for switching from internal to
external oscillator. In this case the internal oscillator is
disabled and the PWM will be switched on the external
frequency. The frequency range of the external oscillator
must be in the range as specified in the switching
characteristics; see Chapter 13.
f
OSC
910
9
×
R
OSC
------------------- Hz
=
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| TDA8922BJ/N2,112 | 功能描述:音頻放大器 2X50W CLASSD PWR AMP RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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