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參數(shù)資料
| 型號(hào)： | 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)： | 34/36頁 |
| 文件大?。?/td> | 733K |
| 代理商： | TDA8920TH/N1,118 |
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2002 Sep 25
7
Philips Semiconductors
Product specication
2
× 80 W class-D power amplier
TDA8920
8
FUNCTIONAL DESCRIPTION
8.1
General
The TDA8920 is a two channel audio power amplifier using
class-D technology. A typical application diagram is
illustrated in Fig.37. A detailed application reference
design is given in Section 16.8. The audio input signal is
converted into a digital Pulse Width Modulated (PWM)
signal via an analog input stage and PWM modulator.
To enable the output power transistors to be driven, this
digital PWM signal is applied to a control and handshake
block and driver circuits for both the high side and low side.
In this way a level shift is performed from the low power
digital PWM signal (at logic levels) to a high power PWM
signal which switches between the main supply lines.
A 2nd-order low-pass filter converts the PWM signal to an
analog audio signal across the loudspeaker.
The TDA8920TH one-chip class-D amplifier contains high
power D-MOS switches, drivers, timing and handshaking
between the power switches and some control logic. For
protection a temperature sensor and a maximum current
detector are built-in.
The two audio channels of the TDA8920TH contain two
PWMs, two analog feedback loops and two differential
input stages. It also contains circuits common to both
channels such as the oscillator, all reference sources, the
mode functionality and a digital timing manager.
The TDA8920TH contains two independent amplifier
channels with high output power, high efficiency (90%),
low distortion and a low quiescent current. The amplifier
channels can be connected in the following configurations:
Mono Bridge-Tied Load (BTL) amplifier
Stereo Single-Ended (SE) amplifiers.
The amplifier system can be switched in three operating
modes with the MODE select pin:
Standby mode; with a very low supply current
Mute mode; the amplifiers are operational, but the audio
signal at the output is suppressed
Operating mode (amplifier fully operational) with output
signal.
For suppressing plop noise the amplifier will remain,
automatically, in the mute mode for approximately 150 ms
before switching to operating mode; see Fig.4. In this time
the coupling capacitors at the input are fully charged.
An example of a switching circuit for driving the mode pin
is illustrated in Fig.3.
handbook, halfpage
standby/
mute
R
mute/on
MODE pin
SGND
MBL463
+5 V
Fig.3 Example of mode select circuit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA8922 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 25 W class-D power amplifier |
| TDA8922B | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 X 50 W class-D power amplifier |
| TDA8922BJ | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 X 50 W class-D power amplifier |
| 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 |
| TDA8922BTH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 X 50 W class-D power amplifier |
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