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參數(shù)資料
| 型號： | TDA7374 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| 中文描述： | 雙通道的橋接音頻放大器汽車收音機 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 171K |
| 代理商： | TDA7374 |
OUTPUT STAGE
The fully complementary output stage was made
possible by the development of a new compo-
nent: the ST exclusive power ICV PNP.
A novel design based upon the connectionshown
in fig. 13 has then allowed the full exploitation of
its possibilities.
The clear advantages thisnew approachhas over
classical output stagesare as follows:
1 - Rail-to-Rail Output Voltage Swing With No
NeedOf Bootstrap Capacitors.
The output swing is limited only by the Vcesat of
the output transistors, which are in the range of
0.6 Ohmeach.
Classical solutions adoptingcomposite PNP-NPN
for the upper output stage have higher saturation
Figure14:
Clipping DetectionWaveforms
loss on the top side of the waveform. This unbal-
anced saturation causes a significant power re-
duction. The only way to recover power consists
of the additionof expensivebootstrap capacitors.
2 - Absolute Stability Without Any External
Compensation.
Referring to the circuit of Fig. 13
V
OUT
/V
IN
is greater than unity, approximately 1 +
R2/R1. The DC Output (V
CC
/2) is fixed by an aux-
iliary amplifier common to all the channels).
By controlling the amount of this local feedbackit
is possible to force the loop gain (A *
β
) to less
than unity at frequency for which the phase shift
is 180 Deg. This means that the output buffer is
intrinsicallystable and not prone to oscillation.
Most remarkably, the above feature has been
achieved in spite of the very low closed loop gain
of the amplifier.
In contrast, with the classical PNP-NPN stage,
the solution adopted for reducing the gain at high
frequencies makes use of external RC networks,
namely the Boucherotcells.
the gain
OTHER OUTSTANDING CHARACTERISTICS:
Clipping Detector Output
The TDA7374B is equipped with an internal cir-
cuitable to detectthe output stage saturationpro-
viding a proper current sinking into a open collec-
tor output (pin 10) when a certain distortion level
is reached at each output.
This particular function allows gain compression
facility whenever the amplifier is overdriven, thus
obtaininghigh quality sound at all listeninglevels.
Figure13:
The new OutputStage
TDA7374B
7/13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7374BV | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7375AH | 2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375AV | 2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375H | 2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375V | 2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7374_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual bridge audio amplifier for car radio |
| TDA7374B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7374BV | 功能描述:音頻放大器 Quad Power Amplifier 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 |
| TDA7374V | 制造商:STMicroelectronics 功能描述:DUAL 21W BRIDGE AMP - Rail/Tube |
| TDA7375 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
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